Vulnerability-Lookup

CERTFR-2025-AVI-0759

Vulnerability from certfr_avis - Published: 2025-09-05 - Updated: 2025-09-05

De multiples vulnérabilités ont été découvertes dans le noyau Linux de SUSE. Certaines d'entre elles permettent à un attaquant de provoquer une atteinte à la confidentialité des données, une atteinte à l'intégrité des données et un contournement de la politique de sécurité.

Solutions

Se référer au bulletin de sécurité de l'éditeur pour l'obtention des correctifs (cf. section Documentation).

Impacted products

Vendor	Product	Description
SUSE	N/A	SUSE Linux Micro 6.1
SUSE	N/A	SUSE Real Time Module 15-SP6
SUSE	N/A	SUSE Linux Enterprise Live Patching 15-SP6
SUSE	N/A	SUSE Linux Enterprise Real Time 15 SP6
SUSE	N/A	openSUSE Leap 15.6
SUSE	N/A	SUSE Linux Enterprise Server for SAP Applications 15 SP6
SUSE	N/A	SUSE Linux Enterprise Server 15 SP6

References

Title

Publication Time

CVE-2024-57947 (GCVE-0-2024-57947)

Vulnerability from cvelistv5 – Published: 2025-01-23 13:54 – Updated: 2026-05-11 21:01

Title

netfilter: nf_set_pipapo: fix initial map fill

Summary

In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_set_pipapo: fix initial map fill The initial buffer has to be inited to all-ones, but it must restrict it to the size of the first field, not the total field size. After each round in the map search step, the result and the fill map are swapped, so if we have a set where f->bsize of the first element is smaller than m->bsize_max, those one-bits are leaked into future rounds result map. This makes pipapo find an incorrect matching results for sets where first field size is not the largest. Followup patch adds a test case to nft_concat_range.sh selftest script. Thanks to Stefano Brivio for pointing out that we need to zero out the remainder explicitly, only correcting memset() argument isn't enough.

Severity

No CVSS data available.

Assigner

Linux

References

6 references

URL	Tags
https://git.kernel.org/stable/c/77bf0c4ab928ca4c9…
https://git.kernel.org/stable/c/957a4d1c4c5849e45…
https://git.kernel.org/stable/c/9625c46ce6fd4f922…
https://git.kernel.org/stable/c/69b6a67f7052905e9…
https://git.kernel.org/stable/c/8058c88ac0df21239…
https://git.kernel.org/stable/c/791a615b7ad2258c5…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 3c4287f62044a90e73a561aa05fc46e62da173da , < 77bf0c4ab928ca4c9a99311f4f70ba0c17fecba9 (git) Affected: 3c4287f62044a90e73a561aa05fc46e62da173da , < 957a4d1c4c5849e4515c9fb4db21bf85318103dc (git) Affected: 3c4287f62044a90e73a561aa05fc46e62da173da , < 9625c46ce6fd4f922595a4b32b1de5066d70464f (git) Affected: 3c4287f62044a90e73a561aa05fc46e62da173da , < 69b6a67f7052905e928d75a0c5871de50e686986 (git) Affected: 3c4287f62044a90e73a561aa05fc46e62da173da , < 8058c88ac0df21239daee54b5934d5c80ca9685f (git) Affected: 3c4287f62044a90e73a561aa05fc46e62da173da , < 791a615b7ad2258c560f91852be54b0480837c93 (git)
Linux	Linux	Affected: 5.6 Unaffected: 0 , < 5.6 (semver) Unaffected: 5.10.247 , ≤ 5.10.* (semver) Unaffected: 5.15.165 , ≤ 5.15.* (semver) Unaffected: 6.1.103 , ≤ 6.1.* (semver) Unaffected: 6.6.44 , ≤ 6.6.* (semver) Unaffected: 6.10.3 , ≤ 6.10.* (semver) Unaffected: 6.11 , ≤ * (original_commit_for_fix)

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JSON

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CVE-2025-21702 (GCVE-0-2025-21702)

Vulnerability from cvelistv5 – Published: 2025-02-18 14:37 – Updated: 2026-05-12 12:03

Title

pfifo_tail_enqueue: Drop new packet when sch->limit == 0

Summary

In the Linux kernel, the following vulnerability has been resolved: pfifo_tail_enqueue: Drop new packet when sch->limit == 0 Expected behaviour: In case we reach scheduler's limit, pfifo_tail_enqueue() will drop a packet in scheduler's queue and decrease scheduler's qlen by one. Then, pfifo_tail_enqueue() enqueue new packet and increase scheduler's qlen by one. Finally, pfifo_tail_enqueue() return `NET_XMIT_CN` status code. Weird behaviour: In case we set `sch->limit == 0` and trigger pfifo_tail_enqueue() on a scheduler that has no packet, the 'drop a packet' step will do nothing. This means the scheduler's qlen still has value equal 0. Then, we continue to enqueue new packet and increase scheduler's qlen by one. In summary, we can leverage pfifo_tail_enqueue() to increase qlen by one and return `NET_XMIT_CN` status code. The problem is: Let's say we have two qdiscs: Qdisc_A and Qdisc_B. - Qdisc_A's type must have '->graft()' function to create parent/child relationship. Let's say Qdisc_A's type is `hfsc`. Enqueue packet to this qdisc will trigger `hfsc_enqueue`. - Qdisc_B's type is pfifo_head_drop. Enqueue packet to this qdisc will trigger `pfifo_tail_enqueue`. - Qdisc_B is configured to have `sch->limit == 0`. - Qdisc_A is configured to route the enqueued's packet to Qdisc_B. Enqueue packet through Qdisc_A will lead to: - hfsc_enqueue(Qdisc_A) -> pfifo_tail_enqueue(Qdisc_B) - Qdisc_B->q.qlen += 1 - pfifo_tail_enqueue() return `NET_XMIT_CN` - hfsc_enqueue() check for `NET_XMIT_SUCCESS` and see `NET_XMIT_CN` => hfsc_enqueue() don't increase qlen of Qdisc_A. The whole process lead to a situation where Qdisc_A->q.qlen == 0 and Qdisc_B->q.qlen == 1. Replace 'hfsc' with other type (for example: 'drr') still lead to the same problem. This violate the design where parent's qlen should equal to the sum of its childrens'qlen. Bug impact: This issue can be used for user->kernel privilege escalation when it is reachable.

Severity

7.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Assigner

Linux

References

11 references

URL	Tags
https://git.kernel.org/stable/c/78285b53266d6d51f…
https://git.kernel.org/stable/c/7a9723ec27aff5674…
https://git.kernel.org/stable/c/a56a6e8589a9b98d8…
https://git.kernel.org/stable/c/020ecb76812a0526f…
https://git.kernel.org/stable/c/79a955ea4a2e5ddf4…
https://git.kernel.org/stable/c/e40cb34b7f247fe2e…
https://git.kernel.org/stable/c/b6a079c3b6f95378f…
https://git.kernel.org/stable/c/647cef20e649c576d…
https://lists.debian.org/debian-lts-announce/2025…
https://lists.debian.org/debian-lts-announce/2025…
https://cert-portal.siemens.com/productcert/html/…

Impacted products

5 products

Vendor	Product	Version
Linux	Linux	Affected: 57dbb2d83d100ea601c54fe129bfde0678db5dee , < 78285b53266d6d51fa4ff504a23df03852eba84e (git) Affected: 57dbb2d83d100ea601c54fe129bfde0678db5dee , < 7a9723ec27aff5674f1fd4934608937f1d650980 (git) Affected: 57dbb2d83d100ea601c54fe129bfde0678db5dee , < a56a6e8589a9b98d8171611fbcc1e45a15fd2455 (git) Affected: 57dbb2d83d100ea601c54fe129bfde0678db5dee , < 020ecb76812a0526f4130ab5aeb6dc7c773e7ab9 (git) Affected: 57dbb2d83d100ea601c54fe129bfde0678db5dee , < 79a955ea4a2e5ddf4a36328959de0de496419888 (git) Affected: 57dbb2d83d100ea601c54fe129bfde0678db5dee , < e40cb34b7f247fe2e366fd192700d1b4f38196ca (git) Affected: 57dbb2d83d100ea601c54fe129bfde0678db5dee , < b6a079c3b6f95378f26e2aeda520cb3176f7067b (git) Affected: 57dbb2d83d100ea601c54fe129bfde0678db5dee , < 647cef20e649c576dff271e018d5d15d998b629d (git)
Linux	Linux	Affected: 2.6.34 Unaffected: 0 , < 2.6.34 (semver) Unaffected: 5.4.291 , ≤ 5.4.* (semver) Unaffected: 5.10.235 , ≤ 5.10.* (semver) Unaffected: 5.15.179 , ≤ 5.15.* (semver) Unaffected: 6.1.130 , ≤ 6.1.* (semver) Unaffected: 6.6.83 , ≤ 6.6.* (semver) Unaffected: 6.12.14 , ≤ 6.12.* (semver) Unaffected: 6.13.3 , ≤ 6.13.* (semver) Unaffected: 6.14 , ≤ * (original_commit_for_fix)
Siemens	SIMATIC S7-1500 CPU 1518-4 PN/DP MFP	Affected: V3.1.5 , < * (custom)
Siemens	SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP	Affected: V3.1.5 , < * (custom)
Siemens	SIPLUS S7-1500 CPU 1518-4 PN/DP MFP	Affected: V3.1.5 , < * (custom)

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            {
              "lessThanOrEqual": "5.4.*",
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              "version": "5.10.235",
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              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.6.83",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.14",
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            },
            {
              "lessThanOrEqual": "6.13.*",
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CVE-2025-21839 (GCVE-0-2025-21839)

Vulnerability from cvelistv5 – Published: 2025-03-07 09:09 – Updated: 2026-05-11 21:07

Title

KVM: x86: Load DR6 with guest value only before entering .vcpu_run() loop

Summary

In the Linux kernel, the following vulnerability has been resolved: KVM: x86: Load DR6 with guest value only before entering .vcpu_run() loop Move the conditional loading of hardware DR6 with the guest's DR6 value out of the core .vcpu_run() loop to fix a bug where KVM can load hardware with a stale vcpu->arch.dr6. When the guest accesses a DR and host userspace isn't debugging the guest, KVM disables DR interception and loads the guest's values into hardware on VM-Enter and saves them on VM-Exit. This allows the guest to access DRs at will, e.g. so that a sequence of DR accesses to configure a breakpoint only generates one VM-Exit. For DR0-DR3, the logic/behavior is identical between VMX and SVM, and also identical between KVM_DEBUGREG_BP_ENABLED (userspace debugging the guest) and KVM_DEBUGREG_WONT_EXIT (guest using DRs), and so KVM handles loading DR0-DR3 in common code, _outside_ of the core kvm_x86_ops.vcpu_run() loop. But for DR6, the guest's value doesn't need to be loaded into hardware for KVM_DEBUGREG_BP_ENABLED, and SVM provides a dedicated VMCB field whereas VMX requires software to manually load the guest value, and so loading the guest's value into DR6 is handled by {svm,vmx}_vcpu_run(), i.e. is done _inside_ the core run loop. Unfortunately, saving the guest values on VM-Exit is initiated by common x86, again outside of the core run loop. If the guest modifies DR6 (in hardware, when DR interception is disabled), and then the next VM-Exit is a fastpath VM-Exit, KVM will reload hardware DR6 with vcpu->arch.dr6 and clobber the guest's actual value. The bug shows up primarily with nested VMX because KVM handles the VMX preemption timer in the fastpath, and the window between hardware DR6 being modified (in guest context) and DR6 being read by guest software is orders of magnitude larger in a nested setup. E.g. in non-nested, the VMX preemption timer would need to fire precisely between #DB injection and the #DB handler's read of DR6, whereas with a KVM-on-KVM setup, the window where hardware DR6 is "dirty" extends all the way from L1 writing DR6 to VMRESUME (in L1). L1's view: ========== <L1 disables DR interception> CPU 0/KVM-7289 [023] d.... 2925.640961: kvm_entry: vcpu 0 A: L1 Writes DR6 CPU 0/KVM-7289 [023] d.... 2925.640963: <hack>: Set DRs, DR6 = 0xffff0ff1 B: CPU 0/KVM-7289 [023] d.... 2925.640967: kvm_exit: vcpu 0 reason EXTERNAL_INTERRUPT intr_info 0x800000ec D: L1 reads DR6, arch.dr6 = 0 CPU 0/KVM-7289 [023] d.... 2925.640969: <hack>: Sync DRs, DR6 = 0xffff0ff0 CPU 0/KVM-7289 [023] d.... 2925.640976: kvm_entry: vcpu 0 L2 reads DR6, L1 disables DR interception CPU 0/KVM-7289 [023] d.... 2925.640980: kvm_exit: vcpu 0 reason DR_ACCESS info1 0x0000000000000216 CPU 0/KVM-7289 [023] d.... 2925.640983: kvm_entry: vcpu 0 CPU 0/KVM-7289 [023] d.... 2925.640983: <hack>: Set DRs, DR6 = 0xffff0ff0 L2 detects failure CPU 0/KVM-7289 [023] d.... 2925.640987: kvm_exit: vcpu 0 reason HLT L1 reads DR6 (confirms failure) CPU 0/KVM-7289 [023] d.... 2925.640990: <hack>: Sync DRs, DR6 = 0xffff0ff0 L0's view: ========== L2 reads DR6, arch.dr6 = 0 CPU 23/KVM-5046 [001] d.... 3410.005610: kvm_exit: vcpu 23 reason DR_ACCESS info1 0x0000000000000216 CPU 23/KVM-5046 [001] ..... 3410.005610: kvm_nested_vmexit: vcpu 23 reason DR_ACCESS info1 0x0000000000000216 L2 => L1 nested VM-Exit CPU 23/KVM-5046 [001] ..... 3410.005610: kvm_nested_vmexit_inject: reason: DR_ACCESS ext_inf1: 0x0000000000000216 CPU 23/KVM-5046 [001] d.... 3410.005610: kvm_entry: vcpu 23 CPU 23/KVM-5046 [001] d.... 3410.005611: kvm_exit: vcpu 23 reason VMREAD CPU 23/KVM-5046 [001] d.... 3410.005611: kvm_entry: vcpu 23 CPU 23/KVM-5046 [001] d.... 3410. ---truncated---

Severity

No CVSS data available.

Assigner

Linux

References

7 references

URL	Tags
https://git.kernel.org/stable/c/9efb2b99b96c86664…
https://git.kernel.org/stable/c/93eeb6df1605b3a24…
https://git.kernel.org/stable/c/a1723e9c53fe64314…
https://git.kernel.org/stable/c/4eb063de686bfcdfd…
https://git.kernel.org/stable/c/d456de38d9eb753a4…
https://git.kernel.org/stable/c/c2fee09fc167c74a6…
https://lists.debian.org/debian-lts-announce/2025…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: d67668e9dd76d98136048935723947156737932b , < 9efb2b99b96c86664bbdbdd2cdb354ac9627eb20 (git) Affected: d67668e9dd76d98136048935723947156737932b , < 93eeb6df1605b3a24f38afdba7ab903ba6b64133 (git) Affected: d67668e9dd76d98136048935723947156737932b , < a1723e9c53fe6431415be19302a56543daf503f5 (git) Affected: d67668e9dd76d98136048935723947156737932b , < 4eb063de686bfcdfd03a8c801d1bbe87d2d5eb55 (git) Affected: d67668e9dd76d98136048935723947156737932b , < d456de38d9eb753a4e9fde053c18d4ef8e485339 (git) Affected: d67668e9dd76d98136048935723947156737932b , < c2fee09fc167c74a64adb08656cb993ea475197e (git)
Linux	Linux	Affected: 5.7 Unaffected: 0 , < 5.7 (semver) Unaffected: 5.15.182 , ≤ 5.15.* (semver) Unaffected: 6.1.138 , ≤ 6.1.* (semver) Unaffected: 6.6.90 , ≤ 6.6.* (semver) Unaffected: 6.12.16 , ≤ 6.12.* (semver) Unaffected: 6.13.4 , ≤ 6.13.* (semver) Unaffected: 6.14 , ≤ * (original_commit_for_fix)

Show details on NVD website

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CVE-2025-21872 (GCVE-0-2025-21872)

Vulnerability from cvelistv5 – Published: 2025-03-27 14:57 – Updated: 2026-05-11 21:08

Title

efi: Don't map the entire mokvar table to determine its size

Summary

In the Linux kernel, the following vulnerability has been resolved: efi: Don't map the entire mokvar table to determine its size Currently, when validating the mokvar table, we (re)map the entire table on each iteration of the loop, adding space as we discover new entries. If the table grows over a certain size, this fails due to limitations of early_memmap(), and we get a failure and traceback: ------------[ cut here ]------------ WARNING: CPU: 0 PID: 0 at mm/early_ioremap.c:139 __early_ioremap+0xef/0x220 ... Call Trace: <TASK> ? __early_ioremap+0xef/0x220 ? __warn.cold+0x93/0xfa ? __early_ioremap+0xef/0x220 ? report_bug+0xff/0x140 ? early_fixup_exception+0x5d/0xb0 ? early_idt_handler_common+0x2f/0x3a ? __early_ioremap+0xef/0x220 ? efi_mokvar_table_init+0xce/0x1d0 ? setup_arch+0x864/0xc10 ? start_kernel+0x6b/0xa10 ? x86_64_start_reservations+0x24/0x30 ? x86_64_start_kernel+0xed/0xf0 ? common_startup_64+0x13e/0x141 </TASK> ---[ end trace 0000000000000000 ]--- mokvar: Failed to map EFI MOKvar config table pa=0x7c4c3000, size=265187. Mapping the entire structure isn't actually necessary, as we don't ever need more than one entry header mapped at once. Changes efi_mokvar_table_init() to only map each entry header, not the entire table, when determining the table size. Since we're not mapping any data past the variable name, it also changes the code to enforce that each variable name is NUL terminated, rather than attempting to verify it in place.

Severity

No CVSS data available.

Assigner

Linux

References

6 references

URL	Tags
https://git.kernel.org/stable/c/46c0454ffb78ce9d3…
https://git.kernel.org/stable/c/ea3f0b362dfe4ef88…
https://git.kernel.org/stable/c/65f4aebb8127708ba…
https://git.kernel.org/stable/c/97bd560b6cc4c2638…
https://git.kernel.org/stable/c/2b90e7ace79774a35…
https://lists.debian.org/debian-lts-announce/2025…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 58c909022a5a56cd1d9e89c8c5461fd1f6a27bb5 , < 46c0454ffb78ce9d3355a3cccac86383ea8ddd55 (git) Affected: 58c909022a5a56cd1d9e89c8c5461fd1f6a27bb5 , < ea3f0b362dfe4ef885ef812bfaf4088176422c91 (git) Affected: 58c909022a5a56cd1d9e89c8c5461fd1f6a27bb5 , < 65f4aebb8127708ba668dd938e83b8558abfc5cd (git) Affected: 58c909022a5a56cd1d9e89c8c5461fd1f6a27bb5 , < 97bd560b6cc4c26386a53b4881bf03e96f9ba03a (git) Affected: 58c909022a5a56cd1d9e89c8c5461fd1f6a27bb5 , < 2b90e7ace79774a3540ce569e000388f8d22c9e0 (git)
Linux	Linux	Affected: 5.10 Unaffected: 0 , < 5.10 (semver) Unaffected: 5.10.235 , ≤ 5.10.* (semver) Unaffected: 6.6.83 , ≤ 6.6.* (semver) Unaffected: 6.12.18 , ≤ 6.12.* (semver) Unaffected: 6.13.6 , ≤ 6.13.* (semver) Unaffected: 6.14 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

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CVE-2025-23163 (GCVE-0-2025-23163)

Vulnerability from cvelistv5 – Published: 2025-05-01 12:55 – Updated: 2026-05-11 21:14

Title

net: vlan: don't propagate flags on open

Summary

In the Linux kernel, the following vulnerability has been resolved: net: vlan: don't propagate flags on open With the device instance lock, there is now a possibility of a deadlock: [ 1.211455] ============================================ [ 1.211571] WARNING: possible recursive locking detected [ 1.211687] 6.14.0-rc5-01215-g032756b4ca7a-dirty #5 Not tainted [ 1.211823] -------------------------------------------- [ 1.211936] ip/184 is trying to acquire lock: [ 1.212032] ffff8881024a4c30 (&dev->lock){+.+.}-{4:4}, at: dev_set_allmulti+0x4e/0xb0 [ 1.212207] [ 1.212207] but task is already holding lock: [ 1.212332] ffff8881024a4c30 (&dev->lock){+.+.}-{4:4}, at: dev_open+0x50/0xb0 [ 1.212487] [ 1.212487] other info that might help us debug this: [ 1.212626] Possible unsafe locking scenario: [ 1.212626] [ 1.212751] CPU0 [ 1.212815] ---- [ 1.212871] lock(&dev->lock); [ 1.212944] lock(&dev->lock); [ 1.213016] [ 1.213016] *** DEADLOCK *** [ 1.213016] [ 1.213143] May be due to missing lock nesting notation [ 1.213143] [ 1.213294] 3 locks held by ip/184: [ 1.213371] #0: ffffffff838b53e0 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_nets_lock+0x1b/0xa0 [ 1.213543] #1: ffffffff84e5fc70 (&net->rtnl_mutex){+.+.}-{4:4}, at: rtnl_nets_lock+0x37/0xa0 [ 1.213727] #2: ffff8881024a4c30 (&dev->lock){+.+.}-{4:4}, at: dev_open+0x50/0xb0 [ 1.213895] [ 1.213895] stack backtrace: [ 1.213991] CPU: 0 UID: 0 PID: 184 Comm: ip Not tainted 6.14.0-rc5-01215-g032756b4ca7a-dirty #5 [ 1.213993] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Arch Linux 1.16.3-1-1 04/01/2014 [ 1.213994] Call Trace: [ 1.213995] <TASK> [ 1.213996] dump_stack_lvl+0x8e/0xd0 [ 1.214000] print_deadlock_bug+0x28b/0x2a0 [ 1.214020] lock_acquire+0xea/0x2a0 [ 1.214027] __mutex_lock+0xbf/0xd40 [ 1.214038] dev_set_allmulti+0x4e/0xb0 # real_dev->flags & IFF_ALLMULTI [ 1.214040] vlan_dev_open+0xa5/0x170 # ndo_open on vlandev [ 1.214042] __dev_open+0x145/0x270 [ 1.214046] __dev_change_flags+0xb0/0x1e0 [ 1.214051] netif_change_flags+0x22/0x60 # IFF_UP vlandev [ 1.214053] dev_change_flags+0x61/0xb0 # for each device in group from dev->vlan_info [ 1.214055] vlan_device_event+0x766/0x7c0 # on netdevsim0 [ 1.214058] notifier_call_chain+0x78/0x120 [ 1.214062] netif_open+0x6d/0x90 [ 1.214064] dev_open+0x5b/0xb0 # locks netdevsim0 [ 1.214066] bond_enslave+0x64c/0x1230 [ 1.214075] do_set_master+0x175/0x1e0 # on netdevsim0 [ 1.214077] do_setlink+0x516/0x13b0 [ 1.214094] rtnl_newlink+0xaba/0xb80 [ 1.214132] rtnetlink_rcv_msg+0x440/0x490 [ 1.214144] netlink_rcv_skb+0xeb/0x120 [ 1.214150] netlink_unicast+0x1f9/0x320 [ 1.214153] netlink_sendmsg+0x346/0x3f0 [ 1.214157] __sock_sendmsg+0x86/0xb0 [ 1.214160] ____sys_sendmsg+0x1c8/0x220 [ 1.214164] ___sys_sendmsg+0x28f/0x2d0 [ 1.214179] __x64_sys_sendmsg+0xef/0x140 [ 1.214184] do_syscall_64+0xec/0x1d0 [ 1.214190] entry_SYSCALL_64_after_hwframe+0x77/0x7f [ 1.214191] RIP: 0033:0x7f2d1b4a7e56 Device setup: netdevsim0 (down) ^ ^ bond netdevsim1.100@netdevsim1 allmulticast=on (down) When we enslave the lower device (netdevsim0) which has a vlan, we propagate vlan's allmuti/promisc flags during ndo_open. This causes (re)locking on of the real_dev. Propagate allmulti/promisc on flags change, not on the open. There is a slight semantics change that vlans that are down now propagate the flags, but this seems unlikely to result in the real issues. Reproducer: echo 0 1 > /sys/bus/netdevsim/new_device dev_path=$(ls -d /sys/bus/netdevsim/devices/netdevsim0/net/*) dev=$(echo $dev_path | rev | cut -d/ -f1 | rev) ip link set dev $dev name netdevsim0 ip link set dev netdevsim0 up ip link add link netdevsim0 name netdevsim0.100 type vlan id 100 ip link set dev netdevsim0.100 allm ---truncated---

Severity

No CVSS data available.

Assigner

Linux

References

11 references

URL	Tags
https://git.kernel.org/stable/c/a32f1d4f1f4c9d978…
https://git.kernel.org/stable/c/b1e3eeb037256a2f1…
https://git.kernel.org/stable/c/523fa0979d842443a…
https://git.kernel.org/stable/c/53fb25e90c0a503a1…
https://git.kernel.org/stable/c/d537859e56bcc3091…
https://git.kernel.org/stable/c/299d7d27af6b5844c…
https://git.kernel.org/stable/c/8980018a9806743d9…
https://git.kernel.org/stable/c/538b43aa21e3b17c1…
https://git.kernel.org/stable/c/27b918007d96402ab…
https://lists.debian.org/debian-lts-announce/2025…
https://lists.debian.org/debian-lts-announce/2025…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 6c78dcbd47a68a7d25d2bee7a6c74b9136cb5fde , < a32f1d4f1f4c9d978698f3c718621f6198f2e7ac (git) Affected: 6c78dcbd47a68a7d25d2bee7a6c74b9136cb5fde , < b1e3eeb037256a2f1206a8d69810ec47eb152026 (git) Affected: 6c78dcbd47a68a7d25d2bee7a6c74b9136cb5fde , < 523fa0979d842443aa14b80002e45b471cbac137 (git) Affected: 6c78dcbd47a68a7d25d2bee7a6c74b9136cb5fde , < 53fb25e90c0a503a17c639341ba5e755cb2feb5c (git) Affected: 6c78dcbd47a68a7d25d2bee7a6c74b9136cb5fde , < d537859e56bcc3091805c524484a4c85386b3cc8 (git) Affected: 6c78dcbd47a68a7d25d2bee7a6c74b9136cb5fde , < 299d7d27af6b5844cda06a0fdfa635705e1bc50f (git) Affected: 6c78dcbd47a68a7d25d2bee7a6c74b9136cb5fde , < 8980018a9806743d9b80837330d46f06ecf78516 (git) Affected: 6c78dcbd47a68a7d25d2bee7a6c74b9136cb5fde , < 538b43aa21e3b17c110104efd218b966d2eda5f8 (git) Affected: 6c78dcbd47a68a7d25d2bee7a6c74b9136cb5fde , < 27b918007d96402aba10ed52a6af8015230f1793 (git)
Linux	Linux	Affected: 2.6.23 Unaffected: 0 , < 2.6.23 (semver) Unaffected: 5.4.293 , ≤ 5.4.* (semver) Unaffected: 5.10.237 , ≤ 5.10.* (semver) Unaffected: 5.15.181 , ≤ 5.15.* (semver) Unaffected: 6.1.135 , ≤ 6.1.* (semver) Unaffected: 6.6.88 , ≤ 6.6.* (semver) Unaffected: 6.12.24 , ≤ 6.12.* (semver) Unaffected: 6.13.12 , ≤ 6.13.* (semver) Unaffected: 6.14.3 , ≤ 6.14.* (semver) Unaffected: 6.15 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

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          "defaultStatus": "affected",
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              "versionType": "semver"
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              "versionType": "semver"
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              "version": "6.12.24",
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            {
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              "status": "unaffected",
              "version": "6.13.12",
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              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.15",
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          ]
        }
      ],
      "cpeApplicability": [
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              "negate": false,
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: vlan: don\u0027t propagate flags on open\n\nWith the device instance lock, there is now a possibility of a deadlock:\n\n[    1.211455] ============================================\n[    1.211571] WARNING: possible recursive locking detected\n[    1.211687] 6.14.0-rc5-01215-g032756b4ca7a-dirty #5 Not tainted\n[    1.211823] --------------------------------------------\n[    1.211936] ip/184 is trying to acquire lock:\n[    1.212032] ffff8881024a4c30 (\u0026dev-\u003elock){+.+.}-{4:4}, at: dev_set_allmulti+0x4e/0xb0\n[    1.212207]\n[    1.212207] but task is already holding lock:\n[    1.212332] ffff8881024a4c30 (\u0026dev-\u003elock){+.+.}-{4:4}, at: dev_open+0x50/0xb0\n[    1.212487]\n[    1.212487] other info that might help us debug this:\n[    1.212626]  Possible unsafe locking scenario:\n[    1.212626]\n[    1.212751]        CPU0\n[    1.212815]        ----\n[    1.212871]   lock(\u0026dev-\u003elock);\n[    1.212944]   lock(\u0026dev-\u003elock);\n[    1.213016]\n[    1.213016]  *** DEADLOCK ***\n[    1.213016]\n[    1.213143]  May be due to missing lock nesting notation\n[    1.213143]\n[    1.213294] 3 locks held by ip/184:\n[    1.213371]  #0: ffffffff838b53e0 (rtnl_mutex){+.+.}-{4:4}, at: rtnl_nets_lock+0x1b/0xa0\n[    1.213543]  #1: ffffffff84e5fc70 (\u0026net-\u003ertnl_mutex){+.+.}-{4:4}, at: rtnl_nets_lock+0x37/0xa0\n[    1.213727]  #2: ffff8881024a4c30 (\u0026dev-\u003elock){+.+.}-{4:4}, at: dev_open+0x50/0xb0\n[    1.213895]\n[    1.213895] stack backtrace:\n[    1.213991] CPU: 0 UID: 0 PID: 184 Comm: ip Not tainted 6.14.0-rc5-01215-g032756b4ca7a-dirty #5\n[    1.213993] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS Arch Linux 1.16.3-1-1 04/01/2014\n[    1.213994] Call Trace:\n[    1.213995]  \u003cTASK\u003e\n[    1.213996]  dump_stack_lvl+0x8e/0xd0\n[    1.214000]  print_deadlock_bug+0x28b/0x2a0\n[    1.214020]  lock_acquire+0xea/0x2a0\n[    1.214027]  __mutex_lock+0xbf/0xd40\n[    1.214038]  dev_set_allmulti+0x4e/0xb0 # real_dev-\u003eflags \u0026 IFF_ALLMULTI\n[    1.214040]  vlan_dev_open+0xa5/0x170 # ndo_open on vlandev\n[    1.214042]  __dev_open+0x145/0x270\n[    1.214046]  __dev_change_flags+0xb0/0x1e0\n[    1.214051]  netif_change_flags+0x22/0x60 # IFF_UP vlandev\n[    1.214053]  dev_change_flags+0x61/0xb0 # for each device in group from dev-\u003evlan_info\n[    1.214055]  vlan_device_event+0x766/0x7c0 # on netdevsim0\n[    1.214058]  notifier_call_chain+0x78/0x120\n[    1.214062]  netif_open+0x6d/0x90\n[    1.214064]  dev_open+0x5b/0xb0 # locks netdevsim0\n[    1.214066]  bond_enslave+0x64c/0x1230\n[    1.214075]  do_set_master+0x175/0x1e0 # on netdevsim0\n[    1.214077]  do_setlink+0x516/0x13b0\n[    1.214094]  rtnl_newlink+0xaba/0xb80\n[    1.214132]  rtnetlink_rcv_msg+0x440/0x490\n[    1.214144]  netlink_rcv_skb+0xeb/0x120\n[    1.214150]  netlink_unicast+0x1f9/0x320\n[    1.214153]  netlink_sendmsg+0x346/0x3f0\n[    1.214157]  __sock_sendmsg+0x86/0xb0\n[    1.214160]  ____sys_sendmsg+0x1c8/0x220\n[    1.214164]  ___sys_sendmsg+0x28f/0x2d0\n[    1.214179]  __x64_sys_sendmsg+0xef/0x140\n[    1.214184]  do_syscall_64+0xec/0x1d0\n[    1.214190]  entry_SYSCALL_64_after_hwframe+0x77/0x7f\n[    1.214191] RIP: 0033:0x7f2d1b4a7e56\n\nDevice setup:\n\n     netdevsim0 (down)\n     ^        ^\n  bond        netdevsim1.100@netdevsim1 allmulticast=on (down)\n\nWhen we enslave the lower device (netdevsim0) which has a vlan, we\npropagate vlan\u0027s allmuti/promisc flags during ndo_open. This causes\n(re)locking on of the real_dev.\n\nPropagate allmulti/promisc on flags change, not on the open. There\nis a slight semantics change that vlans that are down now propagate\nthe flags, but this seems unlikely to result in the real issues.\n\nReproducer:\n\n  echo 0 1 \u003e /sys/bus/netdevsim/new_device\n\n  dev_path=$(ls -d /sys/bus/netdevsim/devices/netdevsim0/net/*)\n  dev=$(echo $dev_path | rev | cut -d/ -f1 | rev)\n\n  ip link set dev $dev name netdevsim0\n  ip link set dev netdevsim0 up\n\n  ip link add link netdevsim0 name netdevsim0.100 type vlan id 100\n  ip link set dev netdevsim0.100 allm\n---truncated---"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-11T21:14:11.352Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/a32f1d4f1f4c9d978698f3c718621f6198f2e7ac"
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        {
          "url": "https://git.kernel.org/stable/c/b1e3eeb037256a2f1206a8d69810ec47eb152026"
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          "url": "https://git.kernel.org/stable/c/523fa0979d842443aa14b80002e45b471cbac137"
        },
        {
          "url": "https://git.kernel.org/stable/c/53fb25e90c0a503a17c639341ba5e755cb2feb5c"
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        {
          "url": "https://git.kernel.org/stable/c/d537859e56bcc3091805c524484a4c85386b3cc8"
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          "url": "https://git.kernel.org/stable/c/299d7d27af6b5844cda06a0fdfa635705e1bc50f"
        },
        {
          "url": "https://git.kernel.org/stable/c/8980018a9806743d9b80837330d46f06ecf78516"
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        {
          "url": "https://git.kernel.org/stable/c/538b43aa21e3b17c110104efd218b966d2eda5f8"
        },
        {
          "url": "https://git.kernel.org/stable/c/27b918007d96402aba10ed52a6af8015230f1793"
        }
      ],
      "title": "net: vlan: don\u0027t propagate flags on open",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-23163",
    "datePublished": "2025-05-01T12:55:47.380Z",
    "dateReserved": "2025-01-11T14:28:41.517Z",
    "dateUpdated": "2026-05-11T21:14:11.352Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

CVE-2025-37752 (GCVE-0-2025-37752)

Vulnerability from cvelistv5 – Published: 2025-05-01 12:55 – Updated: 2026-05-23 15:58

Title

net_sched: sch_sfq: move the limit validation

Summary

In the Linux kernel, the following vulnerability has been resolved: net_sched: sch_sfq: move the limit validation It is not sufficient to directly validate the limit on the data that the user passes as it can be updated based on how the other parameters are changed. Move the check at the end of the configuration update process to also catch scenarios where the limit is indirectly updated, for example with the following configurations: tc qdisc add dev dummy0 handle 1: root sfq limit 2 flows 1 depth 1 tc qdisc add dev dummy0 handle 1: root sfq limit 2 flows 1 divisor 1 This fixes the following syzkaller reported crash: ------------[ cut here ]------------ UBSAN: array-index-out-of-bounds in net/sched/sch_sfq.c:203:6 index 65535 is out of range for type 'struct sfq_head[128]' CPU: 1 UID: 0 PID: 3037 Comm: syz.2.16 Not tainted 6.14.0-rc2-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 12/27/2024 Call Trace: <TASK> __dump_stack lib/dump_stack.c:94 [inline] dump_stack_lvl+0x201/0x300 lib/dump_stack.c:120 ubsan_epilogue lib/ubsan.c:231 [inline] __ubsan_handle_out_of_bounds+0xf5/0x120 lib/ubsan.c:429 sfq_link net/sched/sch_sfq.c:203 [inline] sfq_dec+0x53c/0x610 net/sched/sch_sfq.c:231 sfq_dequeue+0x34e/0x8c0 net/sched/sch_sfq.c:493 sfq_reset+0x17/0x60 net/sched/sch_sfq.c:518 qdisc_reset+0x12e/0x600 net/sched/sch_generic.c:1035 tbf_reset+0x41/0x110 net/sched/sch_tbf.c:339 qdisc_reset+0x12e/0x600 net/sched/sch_generic.c:1035 dev_reset_queue+0x100/0x1b0 net/sched/sch_generic.c:1311 netdev_for_each_tx_queue include/linux/netdevice.h:2590 [inline] dev_deactivate_many+0x7e5/0xe70 net/sched/sch_generic.c:1375

Severity

No CVSS data available.

Assigner

Linux

References

10 references

URL	Tags
https://git.kernel.org/stable/c/8fadc871a42933aac…
https://git.kernel.org/stable/c/7d62ded97db6b7c94…
https://git.kernel.org/stable/c/6c589aa318023690f…
https://git.kernel.org/stable/c/1348214fa042a7140…
https://git.kernel.org/stable/c/d2718324f9e329b10…
https://git.kernel.org/stable/c/f86293adce0c201cf…
https://git.kernel.org/stable/c/5e5e1fcc1b8ed57f9…
https://git.kernel.org/stable/c/b36a68192037d1614…
https://git.kernel.org/stable/c/b3bf8f63e6179076b…
https://lists.debian.org/debian-lts-announce/2025…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: e12f6013d0a69660e8b99bfe381b9546ae667328 , < 8fadc871a42933aacb7f1ce9ed9a96485e2c9cf4 (git) Affected: 1e6d9d87626cf89eeffb4d943db12cb5b10bf961 , < 7d62ded97db6b7c94c891f704151f372b1ba4688 (git) Affected: 1b562b7f9231432da40d12e19786c1bd7df653a7 , < 6c589aa318023690f1606c666a7fb5f4c1c9c219 (git) Affected: 35d0137305ae2f97260a9047f445bd4434bd6cc7 , < 1348214fa042a71406964097e743c87a42c85a49 (git) Affected: 833e9a1c27b82024db7ff5038a51651f48f05e5e , < d2718324f9e329b10ddc091fba5a0ba2b9d4d96a (git) Affected: 7d8947f2153ee9c5ab4cb17861a11cc45f30e8c4 , < f86293adce0c201cfabb283ef9d6f21292089bb8 (git) Affected: 7fefc294204f10a3405f175f4ac2be16d63f135e , < 5e5e1fcc1b8ed57f902c424c5d9b328a3a19073d (git) Affected: 10685681bafce6febb39770f3387621bf5d67d0b , < b36a68192037d1614317a09b0d78c7814e2eecf9 (git) Affected: 10685681bafce6febb39770f3387621bf5d67d0b , < b3bf8f63e6179076b57c9de660c9f80b5abefe70 (git) Affected: 6.1.129 , < 6.1.135 (semver) Affected: 6.6.76 , < 6.6.88 (semver) Affected: 6.12.13 , < 6.12.24 (semver) Affected: 6.13.2 , < 6.13.12 (semver)
Linux	Linux	Affected: 6.14 Unaffected: 0 , < 6.14 (semver) Unaffected: 6.1.135 , ≤ 6.1.* (semver) Unaffected: 6.6.88 , ≤ 6.6.* (semver) Unaffected: 6.12.24 , ≤ 6.12.* (semver) Unaffected: 6.13.12 , ≤ 6.13.* (semver) Unaffected: 6.14.3 , ≤ 6.14.* (semver) Unaffected: 6.15 , ≤ * (original_commit_for_fix)

Show details on NVD website

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{
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        "providerMetadata": {
          "dateUpdated": "2025-11-03T19:54:26.177Z",
          "orgId": "af854a3a-2127-422b-91ae-364da2661108",
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        "references": [
          {
            "url": "https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html"
          }
        ],
        "title": "CVE Program Container"
      }
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    "cna": {
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          "defaultStatus": "unaffected",
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          "programFiles": [
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CVE-2025-37797 (GCVE-0-2025-37797)

Vulnerability from cvelistv5 – Published: 2025-05-02 14:16 – Updated: 2026-05-11 21:15

Title

net_sched: hfsc: Fix a UAF vulnerability in class handling

Summary

In the Linux kernel, the following vulnerability has been resolved: net_sched: hfsc: Fix a UAF vulnerability in class handling This patch fixes a Use-After-Free vulnerability in the HFSC qdisc class handling. The issue occurs due to a time-of-check/time-of-use condition in hfsc_change_class() when working with certain child qdiscs like netem or codel. The vulnerability works as follows: 1. hfsc_change_class() checks if a class has packets (q.qlen != 0) 2. It then calls qdisc_peek_len(), which for certain qdiscs (e.g., codel, netem) might drop packets and empty the queue 3. The code continues assuming the queue is still non-empty, adding the class to vttree 4. This breaks HFSC scheduler assumptions that only non-empty classes are in vttree 5. Later, when the class is destroyed, this can lead to a Use-After-Free The fix adds a second queue length check after qdisc_peek_len() to verify the queue wasn't emptied.

Severity

No CVSS data available.

Assigner

Linux

References

10 references

URL	Tags
https://git.kernel.org/stable/c/28b09a067831f7317…
https://git.kernel.org/stable/c/39b9095dd3b55d9b2…
https://git.kernel.org/stable/c/fcc8ede663569c704…
https://git.kernel.org/stable/c/20d584a33e480ae80…
https://git.kernel.org/stable/c/3aa852e3605000d5c…
https://git.kernel.org/stable/c/86cd4641c713455a4…
https://git.kernel.org/stable/c/bb583c88d23b72d8d…
https://git.kernel.org/stable/c/3df275ef0a6ae181e…
https://lists.debian.org/debian-lts-announce/2025…
https://lists.debian.org/debian-lts-announce/2025…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 21f4d5cc25ec0e6e8eb8420dd2c399e6d2fc7d14 , < 28b09a067831f7317c3841812276022d6c940677 (git) Affected: 21f4d5cc25ec0e6e8eb8420dd2c399e6d2fc7d14 , < 39b9095dd3b55d9b2743df038c32138efa34a9de (git) Affected: 21f4d5cc25ec0e6e8eb8420dd2c399e6d2fc7d14 , < fcc8ede663569c704fb00a702973bd6c00373283 (git) Affected: 21f4d5cc25ec0e6e8eb8420dd2c399e6d2fc7d14 , < 20d584a33e480ae80d105f43e0e7b56784da41b9 (git) Affected: 21f4d5cc25ec0e6e8eb8420dd2c399e6d2fc7d14 , < 3aa852e3605000d5c47035c3fc3a986d14ccfa9f (git) Affected: 21f4d5cc25ec0e6e8eb8420dd2c399e6d2fc7d14 , < 86cd4641c713455a4f1c8e54c370c598c2b1cee0 (git) Affected: 21f4d5cc25ec0e6e8eb8420dd2c399e6d2fc7d14 , < bb583c88d23b72d8d16453d24856c99bd93dadf5 (git) Affected: 21f4d5cc25ec0e6e8eb8420dd2c399e6d2fc7d14 , < 3df275ef0a6ae181e8428a6589ef5d5231e58b5c (git)
Linux	Linux	Affected: 4.14 Unaffected: 0 , < 4.14 (semver) Unaffected: 5.4.293 , ≤ 5.4.* (semver) Unaffected: 5.10.237 , ≤ 5.10.* (semver) Unaffected: 5.15.181 , ≤ 5.15.* (semver) Unaffected: 6.1.136 , ≤ 6.1.* (semver) Unaffected: 6.6.89 , ≤ 6.6.* (semver) Unaffected: 6.12.26 , ≤ 6.12.* (semver) Unaffected: 6.14.5 , ≤ 6.14.* (semver) Unaffected: 6.15 , ≤ * (original_commit_for_fix)

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CVE-2025-37798 (GCVE-0-2025-37798)

Vulnerability from cvelistv5 – Published: 2025-05-02 14:16 – Updated: 2026-05-11 21:15

Title

codel: remove sch->q.qlen check before qdisc_tree_reduce_backlog()

Summary

In the Linux kernel, the following vulnerability has been resolved: codel: remove sch->q.qlen check before qdisc_tree_reduce_backlog() After making all ->qlen_notify() callbacks idempotent, now it is safe to remove the check of qlen!=0 from both fq_codel_dequeue() and codel_qdisc_dequeue().

Severity

No CVSS data available.

Assigner

Linux

References

11 references

URL	Tags
https://git.kernel.org/stable/c/7a742a9506849d1c1…
https://git.kernel.org/stable/c/cc71a757da78dd4aa…
https://git.kernel.org/stable/c/eda741fe155ddf5ec…
https://git.kernel.org/stable/c/829c49b6b2ff45b04…
https://git.kernel.org/stable/c/2f9761a94bae33d26…
https://git.kernel.org/stable/c/4d55144b12e742404…
https://git.kernel.org/stable/c/e73c838c80dccb9e4…
https://git.kernel.org/stable/c/a57fe60ef4cf96bfb…
https://git.kernel.org/stable/c/342debc12183b5177…
https://lists.debian.org/debian-lts-announce/2025…
https://lists.debian.org/debian-lts-announce/2025…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 76e3cc126bb223013a6b9a0e2a51238d1ef2e409 , < 7a742a9506849d1c1aa71e36c89855ceddc7d58e (git) Affected: 76e3cc126bb223013a6b9a0e2a51238d1ef2e409 , < cc71a757da78dd4aa1b4a9b19cb011833730ccf2 (git) Affected: 76e3cc126bb223013a6b9a0e2a51238d1ef2e409 , < eda741fe155ddf5ecd2dd3bfbd4fc3c0c7dbb450 (git) Affected: 76e3cc126bb223013a6b9a0e2a51238d1ef2e409 , < 829c49b6b2ff45b043739168fd1245e4e1a91a30 (git) Affected: 76e3cc126bb223013a6b9a0e2a51238d1ef2e409 , < 2f9761a94bae33d26e6a81b31b36e7d776d93dc1 (git) Affected: 76e3cc126bb223013a6b9a0e2a51238d1ef2e409 , < 4d55144b12e742404bb3f8fee6038bafbf45619d (git) Affected: 76e3cc126bb223013a6b9a0e2a51238d1ef2e409 , < e73c838c80dccb9e4f19becc11d9f3cb4a27d483 (git) Affected: 76e3cc126bb223013a6b9a0e2a51238d1ef2e409 , < a57fe60ef4cf96bfbb6b58397ec28bdb5a5c6b31 (git) Affected: 76e3cc126bb223013a6b9a0e2a51238d1ef2e409 , < 342debc12183b51773b3345ba267e9263bdfaaef (git)
Linux	Linux	Affected: 3.5 Unaffected: 0 , < 3.5 (semver) Unaffected: 5.4.297 , ≤ 5.4.* (semver) Unaffected: 5.10.241 , ≤ 5.10.* (semver) Unaffected: 5.15.190 , ≤ 5.15.* (semver) Unaffected: 6.1.135 , ≤ 6.1.* (semver) Unaffected: 6.6.88 , ≤ 6.6.* (semver) Unaffected: 6.12.24 , ≤ 6.12.* (semver) Unaffected: 6.13.12 , ≤ 6.13.* (semver) Unaffected: 6.14.3 , ≤ 6.14.* (semver) Unaffected: 6.15 , ≤ * (original_commit_for_fix)

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JSON

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CVE-2025-37856 (GCVE-0-2025-37856)

Vulnerability from cvelistv5 – Published: 2025-05-09 06:42 – Updated: 2026-05-23 15:58

Title

btrfs: harden block_group::bg_list against list_del() races

Summary

In the Linux kernel, the following vulnerability has been resolved: btrfs: harden block_group::bg_list against list_del() races As far as I can tell, these calls of list_del_init() on bg_list cannot run concurrently with btrfs_mark_bg_unused() or btrfs_mark_bg_to_reclaim(), as they are in transaction error paths and situations where the block group is readonly. However, if there is any chance at all of racing with mark_bg_unused(), or a different future user of bg_list, better to be safe than sorry. Otherwise we risk the following interleaving (bg_list refcount in parens) T1 (some random op) T2 (btrfs_mark_bg_unused) !list_empty(&bg->bg_list); (1) list_del_init(&bg->bg_list); (1) list_move_tail (1) btrfs_put_block_group (0) btrfs_delete_unused_bgs bg = list_first_entry list_del_init(&bg->bg_list); btrfs_put_block_group(bg); (-1) Ultimately, this results in a broken ref count that hits zero one deref early and the real final deref underflows the refcount, resulting in a WARNING.

Severity

No CVSS data available.

Assigner

Linux

References

4 references

URL	Tags
https://git.kernel.org/stable/c/bf089c4d1141b2733…
https://git.kernel.org/stable/c/909e60fb469d4101c…
https://git.kernel.org/stable/c/185fd73e5ac06027c…
https://git.kernel.org/stable/c/7511e29cf1355b2c4…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: a9f189716cf15913c453299d72f69c51a9b0f86b , < bf089c4d1141b27332c092b1dcca5022c415a3b6 (git) Affected: a9f189716cf15913c453299d72f69c51a9b0f86b , < 909e60fb469d4101c6b08cf6e622efb062bb24a1 (git) Affected: a9f189716cf15913c453299d72f69c51a9b0f86b , < 185fd73e5ac06027c4be9a129e59193f6a3ef202 (git) Affected: a9f189716cf15913c453299d72f69c51a9b0f86b , < 7511e29cf1355b2c47d0effb39e463119913e2f6 (git) Affected: edf3b5aadb2515c808200b904baa5b70a727f0ac (git) Affected: 01eca70ef8cf499d0cb6d1bbd691558e7792cf17 (git) Affected: 5d19abcffd8404078dfa7d7118cec357b5e7bc58 (git) Affected: 5.15.128 , < 5.16 (semver) Affected: 6.1.47 , < 6.2 (semver) Affected: 6.4.12 , < 6.5 (semver)
Linux	Linux	Affected: 6.5 Unaffected: 0 , < 6.5 (semver) Unaffected: 6.12.24 , ≤ 6.12.* (semver) Unaffected: 6.13.12 , ≤ 6.13.* (semver) Unaffected: 6.14.3 , ≤ 6.14.* (semver) Unaffected: 6.15 , ≤ * (original_commit_for_fix)

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JSON

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    "dateReserved": "2025-04-16T04:51:23.956Z",
    "dateUpdated": "2026-05-23T15:58:25.284Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

CVE-2025-37864 (GCVE-0-2025-37864)

Vulnerability from cvelistv5 – Published: 2025-05-09 06:43 – Updated: 2026-06-01 16:05

Title

net: dsa: clean up FDB, MDB, VLAN entries on unbind

Summary

In the Linux kernel, the following vulnerability has been resolved: net: dsa: clean up FDB, MDB, VLAN entries on unbind As explained in many places such as commit b117e1e8a86d ("net: dsa: delete dsa_legacy_fdb_add and dsa_legacy_fdb_del"), DSA is written given the assumption that higher layers have balanced additions/deletions. As such, it only makes sense to be extremely vocal when those assumptions are violated and the driver unbinds with entries still present. But Ido Schimmel points out a very simple situation where that is wrong: https://lore.kernel.org/netdev/ZDazSM5UsPPjQuKr@shredder/ (also briefly discussed by me in the aforementioned commit). Basically, while the bridge bypass operations are not something that DSA explicitly documents, and for the majority of DSA drivers this API simply causes them to go to promiscuous mode, that isn't the case for all drivers. Some have the necessary requirements for bridge bypass operations to do something useful - see dsa_switch_supports_uc_filtering(). Although in tools/testing/selftests/net/forwarding/local_termination.sh, we made an effort to popularize better mechanisms to manage address filters on DSA interfaces from user space - namely macvlan for unicast, and setsockopt(IP_ADD_MEMBERSHIP) - through mtools - for multicast, the fact is that 'bridge fdb add ... self static local' also exists as kernel UAPI, and might be useful to someone, even if only for a quick hack. It seems counter-productive to block that path by implementing shim .ndo_fdb_add and .ndo_fdb_del operations which just return -EOPNOTSUPP in order to prevent the ndo_dflt_fdb_add() and ndo_dflt_fdb_del() from running, although we could do that. Accepting that cleanup is necessary seems to be the only option. Especially since we appear to be coming back at this from a different angle as well. Russell King is noticing that the WARN_ON() triggers even for VLANs: https://lore.kernel.org/netdev/Z_li8Bj8bD4-BYKQ@shell.armlinux.org.uk/ What happens in the bug report above is that dsa_port_do_vlan_del() fails, then the VLAN entry lingers on, and then we warn on unbind and leak it. This is not a straight revert of the blamed commit, but we now add an informational print to the kernel log (to still have a way to see that bugs exist), and some extra comments gathered from past years' experience, to justify the logic.

Severity

No CVSS data available.

Assigner

Linux

References

5 references

URL	Tags
https://git.kernel.org/stable/c/5e531e71b9d21d5e9…
https://git.kernel.org/stable/c/86c6613a69bca815f…
https://git.kernel.org/stable/c/8fcc1e6f808912977…
https://git.kernel.org/stable/c/99c50c98803425378…
https://git.kernel.org/stable/c/7afb5fb42d4950f33…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 0832cd9f1f023226527e95002d537123061ddac4 , < 5e531e71b9d21d5e985251440e0d722f71299b7a (git) Affected: 0832cd9f1f023226527e95002d537123061ddac4 , < 86c6613a69bca815f1865ed8cedfd4b9142621ab (git) Affected: 0832cd9f1f023226527e95002d537123061ddac4 , < 8fcc1e6f808912977caf17366c625b95dc29ba4f (git) Affected: 0832cd9f1f023226527e95002d537123061ddac4 , < 99c50c98803425378e08a7394dc885506dc85f06 (git) Affected: 0832cd9f1f023226527e95002d537123061ddac4 , < 7afb5fb42d4950f33af2732b8147c552659f79b7 (git)
Linux	Linux	Affected: 5.18 Unaffected: 0 , < 5.18 (semver) Unaffected: 6.1.175 , ≤ 6.1.* (semver) Unaffected: 6.6.88 , ≤ 6.6.* (semver) Unaffected: 6.12.25 , ≤ 6.12.* (semver) Unaffected: 6.14.4 , ≤ 6.14.* (semver) Unaffected: 6.15 , ≤ * (original_commit_for_fix)

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}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

CERTFR-2025-AVI-0759

Solutions

CVE-2024-57947 (GCVE-0-2024-57947)

CVE-2025-21702 (GCVE-0-2025-21702)

CVE-2025-21839 (GCVE-0-2025-21839)

CVE-2025-21872 (GCVE-0-2025-21872)

CVE-2025-23163 (GCVE-0-2025-23163)

CVE-2025-37752 (GCVE-0-2025-37752)

CVE-2025-37797 (GCVE-0-2025-37797)

CVE-2025-37798 (GCVE-0-2025-37798)

CVE-2025-37856 (GCVE-0-2025-37856)

CVE-2025-37864 (GCVE-0-2025-37864)

Tags

Sightings

Nomenclature