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alsa-2026:45116
Vulnerability from osv_almalinux
Published
2026-07-24 00:00
Modified
2026-07-24 13:39
Summary
Important: kernel-rt security update
Details
The kernel-rt packages provide the Real Time Linux Kernel, which enables
fine-tuning for systems with extremely high determinism requirements.
Security Fix(es):
- kernel: KVM: x86: Don't (re)check L1 intercepts when completing userspace I/O (CVE-2025-40026)
- kernel: xfrm single-frag length not properly limited
- kernel: dm log: fix out-of-bounds write due to region_count overflow (CVE-2026-53059)
- kernel: tipc: fix double-free in tipc_buf_append() (CVE-2026-52993)
References
{
"affected": [
{
"package": {
"ecosystem": "AlmaLinux:8",
"name": "kernel-rt"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "4.18.0-553.147.1.rt7.488.el8_10"
}
],
"type": "ECOSYSTEM"
}
]
},
{
"package": {
"ecosystem": "AlmaLinux:8",
"name": "kernel-rt-core"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "4.18.0-553.147.1.rt7.488.el8_10"
}
],
"type": "ECOSYSTEM"
}
]
},
{
"package": {
"ecosystem": "AlmaLinux:8",
"name": "kernel-rt-debug"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "4.18.0-553.147.1.rt7.488.el8_10"
}
],
"type": "ECOSYSTEM"
}
]
},
{
"package": {
"ecosystem": "AlmaLinux:8",
"name": "kernel-rt-debug-core"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "4.18.0-553.147.1.rt7.488.el8_10"
}
],
"type": "ECOSYSTEM"
}
]
},
{
"package": {
"ecosystem": "AlmaLinux:8",
"name": "kernel-rt-debug-devel"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "4.18.0-553.147.1.rt7.488.el8_10"
}
],
"type": "ECOSYSTEM"
}
]
},
{
"package": {
"ecosystem": "AlmaLinux:8",
"name": "kernel-rt-debug-modules"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "4.18.0-553.147.1.rt7.488.el8_10"
}
],
"type": "ECOSYSTEM"
}
]
},
{
"package": {
"ecosystem": "AlmaLinux:8",
"name": "kernel-rt-debug-modules-extra"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "4.18.0-553.147.1.rt7.488.el8_10"
}
],
"type": "ECOSYSTEM"
}
]
},
{
"package": {
"ecosystem": "AlmaLinux:8",
"name": "kernel-rt-devel"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "4.18.0-553.147.1.rt7.488.el8_10"
}
],
"type": "ECOSYSTEM"
}
]
},
{
"package": {
"ecosystem": "AlmaLinux:8",
"name": "kernel-rt-modules"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "4.18.0-553.147.1.rt7.488.el8_10"
}
],
"type": "ECOSYSTEM"
}
]
},
{
"package": {
"ecosystem": "AlmaLinux:8",
"name": "kernel-rt-modules-extra"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "4.18.0-553.147.1.rt7.488.el8_10"
}
],
"type": "ECOSYSTEM"
}
]
}
],
"details": "The kernel-rt packages provide the Real Time Linux Kernel, which enables \nfine-tuning for systems with extremely high determinism requirements. \n\nSecurity Fix(es): \n\n * kernel: KVM: x86: Don\u0027t (re)check L1 intercepts when completing userspace I/O (CVE-2025-40026)\n * kernel: xfrm single-frag length not properly limited\n * kernel: dm log: fix out-of-bounds write due to region_count overflow (CVE-2026-53059)\n * kernel: tipc: fix double-free in tipc_buf_append() (CVE-2026-52993)\n\n\n",
"id": "ALSA-2026:45116",
"modified": "2026-07-24T13:39:51Z",
"published": "2026-07-24T00:00:00Z",
"references": [
{
"type": "ADVISORY",
"url": "https://access.redhat.com/errata/RHSA-2026:45116"
},
{
"type": "REPORT",
"url": "https://access.redhat.com/security/cve/CVE-2025-40026"
},
{
"type": "REPORT",
"url": "https://access.redhat.com/security/cve/CVE-2026-52993"
},
{
"type": "REPORT",
"url": "https://access.redhat.com/security/cve/CVE-2026-53059"
},
{
"type": "REPORT",
"url": "https://bugzilla.redhat.com/2406712"
},
{
"type": "REPORT",
"url": "https://bugzilla.redhat.com/2492277"
},
{
"type": "REPORT",
"url": "https://bugzilla.redhat.com/2492437"
},
{
"type": "ADVISORY",
"url": "https://errata.almalinux.org/8/ALSA-2026-45116.html"
}
],
"related": [
"CVE-2025-40026",
"CVE-2026-53059",
"CVE-2026-52993"
],
"summary": "Important: kernel-rt security update"
}
CVE-2025-40026 (GCVE-0-2025-40026)
Vulnerability from cvelistv5 – Published: 2025-10-28 09:32 – Updated: 2026-05-11 21:41
VLAI
EPSS
VEX
Title
KVM: x86: Don't (re)check L1 intercepts when completing userspace I/O
Summary
In the Linux kernel, the following vulnerability has been resolved:
KVM: x86: Don't (re)check L1 intercepts when completing userspace I/O
When completing emulation of instruction that generated a userspace exit
for I/O, don't recheck L1 intercepts as KVM has already finished that
phase of instruction execution, i.e. has already committed to allowing L2
to perform I/O. If L1 (or host userspace) modifies the I/O permission
bitmaps during the exit to userspace, KVM will treat the access as being
intercepted despite already having emulated the I/O access.
Pivot on EMULTYPE_NO_DECODE to detect that KVM is completing emulation.
Of the three users of EMULTYPE_NO_DECODE, only complete_emulated_io() (the
intended "recipient") can reach the code in question. gp_interception()'s
use is mutually exclusive with is_guest_mode(), and
complete_emulated_insn_gp() unconditionally pairs EMULTYPE_NO_DECODE with
EMULTYPE_SKIP.
The bad behavior was detected by a syzkaller program that toggles port I/O
interception during the userspace I/O exit, ultimately resulting in a WARN
on vcpu->arch.pio.count being non-zero due to KVM no completing emulation
of the I/O instruction.
WARNING: CPU: 23 PID: 1083 at arch/x86/kvm/x86.c:8039 emulator_pio_in_out+0x154/0x170 [kvm]
Modules linked in: kvm_intel kvm irqbypass
CPU: 23 UID: 1000 PID: 1083 Comm: repro Not tainted 6.16.0-rc5-c1610d2d66b1-next-vm #74 NONE
Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 0.0.0 02/06/2015
RIP: 0010:emulator_pio_in_out+0x154/0x170 [kvm]
PKRU: 55555554
Call Trace:
<TASK>
kvm_fast_pio+0xd6/0x1d0 [kvm]
vmx_handle_exit+0x149/0x610 [kvm_intel]
kvm_arch_vcpu_ioctl_run+0xda8/0x1ac0 [kvm]
kvm_vcpu_ioctl+0x244/0x8c0 [kvm]
__x64_sys_ioctl+0x8a/0xd0
do_syscall_64+0x5d/0xc60
entry_SYSCALL_64_after_hwframe+0x4b/0x53
</TASK>
Severity
No CVSS data available.
Assigner
References
9 references
| URL | Tags |
|---|---|
| https://git.kernel.org/stable/c/a908eca437789589d… | |
| https://git.kernel.org/stable/c/00338255bb1f42264… | |
| https://git.kernel.org/stable/c/e0ce3ed1048a47986… | |
| https://git.kernel.org/stable/c/ba35a5d775799ce5a… | |
| https://git.kernel.org/stable/c/3d3abf3f7e8b1abb0… | |
| https://git.kernel.org/stable/c/e7177c7e32cb806f3… | |
| https://git.kernel.org/stable/c/3a062a5c55adc5507… | |
| https://git.kernel.org/stable/c/7366830642505683b… | |
| https://git.kernel.org/stable/c/e750f85391286a4c8… |
Impacted products
2 products
| Vendor | Product | Version | |
|---|---|---|---|
| Linux | Linux |
Affected:
8a76d7f25f8f24fc5a328c8e15e4a7313cf141b9 , < a908eca437789589dd4624da428614c1275064dc
(git)
Affected: 8a76d7f25f8f24fc5a328c8e15e4a7313cf141b9 , < 00338255bb1f422642fb2798ebe92e93b6e4209b (git) Affected: 8a76d7f25f8f24fc5a328c8e15e4a7313cf141b9 , < e0ce3ed1048a47986d15aef1a98ebda25560d257 (git) Affected: 8a76d7f25f8f24fc5a328c8e15e4a7313cf141b9 , < ba35a5d775799ce5ad60230be97336f2fefd518e (git) Affected: 8a76d7f25f8f24fc5a328c8e15e4a7313cf141b9 , < 3d3abf3f7e8b1abb082070a343de82d7efc80523 (git) Affected: 8a76d7f25f8f24fc5a328c8e15e4a7313cf141b9 , < e7177c7e32cb806f348387b7f4faafd4a5b32054 (git) Affected: 8a76d7f25f8f24fc5a328c8e15e4a7313cf141b9 , < 3a062a5c55adc5507600b9ae6d911e247e2f1d6e (git) Affected: 8a76d7f25f8f24fc5a328c8e15e4a7313cf141b9 , < 7366830642505683bbe905a2ba5d18d6e4b512b8 (git) Affected: 8a76d7f25f8f24fc5a328c8e15e4a7313cf141b9 , < e750f85391286a4c8100275516973324b621a269 (git) |
|
| Linux | Linux |
Affected:
3.0
Unaffected: 0 , < 3.0 (semver) Unaffected: 5.4.301 , ≤ 5.4.* (semver) Unaffected: 5.10.246 , ≤ 5.10.* (semver) Unaffected: 5.15.195 , ≤ 5.15.* (semver) Unaffected: 6.1.157 , ≤ 6.1.* (semver) Unaffected: 6.6.111 , ≤ 6.6.* (semver) Unaffected: 6.12.52 , ≤ 6.12.* (semver) Unaffected: 6.16.12 , ≤ 6.16.* (semver) Unaffected: 6.17.2 , ≤ 6.17.* (semver) Unaffected: 6.18 , ≤ * (original_commit_for_fix) |
{
"containers": {
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],
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"versionType": "git"
}
]
},
{
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"product": "Linux",
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"arch/x86/kvm/kvm_emulate.h",
"arch/x86/kvm/x86.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
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"version": "3.0"
},
{
"lessThan": "3.0",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
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"status": "unaffected",
"version": "5.4.301",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.246",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.195",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.157",
"versionType": "semver"
},
{
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"status": "unaffected",
"version": "6.6.111",
"versionType": "semver"
},
{
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"status": "unaffected",
"version": "6.12.52",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.16.*",
"status": "unaffected",
"version": "6.16.12",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.17.*",
"status": "unaffected",
"version": "6.17.2",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "6.18",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.4.301",
"versionStartIncluding": "3.0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.10.246",
"versionStartIncluding": "3.0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.15.195",
"versionStartIncluding": "3.0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.1.157",
"versionStartIncluding": "3.0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.6.111",
"versionStartIncluding": "3.0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.12.52",
"versionStartIncluding": "3.0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.16.12",
"versionStartIncluding": "3.0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.17.2",
"versionStartIncluding": "3.0",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.18",
"versionStartIncluding": "3.0",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: x86: Don\u0027t (re)check L1 intercepts when completing userspace I/O\n\nWhen completing emulation of instruction that generated a userspace exit\nfor I/O, don\u0027t recheck L1 intercepts as KVM has already finished that\nphase of instruction execution, i.e. has already committed to allowing L2\nto perform I/O. If L1 (or host userspace) modifies the I/O permission\nbitmaps during the exit to userspace, KVM will treat the access as being\nintercepted despite already having emulated the I/O access.\n\nPivot on EMULTYPE_NO_DECODE to detect that KVM is completing emulation.\nOf the three users of EMULTYPE_NO_DECODE, only complete_emulated_io() (the\nintended \"recipient\") can reach the code in question. gp_interception()\u0027s\nuse is mutually exclusive with is_guest_mode(), and\ncomplete_emulated_insn_gp() unconditionally pairs EMULTYPE_NO_DECODE with\nEMULTYPE_SKIP.\n\nThe bad behavior was detected by a syzkaller program that toggles port I/O\ninterception during the userspace I/O exit, ultimately resulting in a WARN\non vcpu-\u003earch.pio.count being non-zero due to KVM no completing emulation\nof the I/O instruction.\n\n WARNING: CPU: 23 PID: 1083 at arch/x86/kvm/x86.c:8039 emulator_pio_in_out+0x154/0x170 [kvm]\n Modules linked in: kvm_intel kvm irqbypass\n CPU: 23 UID: 1000 PID: 1083 Comm: repro Not tainted 6.16.0-rc5-c1610d2d66b1-next-vm #74 NONE\n Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 0.0.0 02/06/2015\n RIP: 0010:emulator_pio_in_out+0x154/0x170 [kvm]\n PKRU: 55555554\n Call Trace:\n \u003cTASK\u003e\n kvm_fast_pio+0xd6/0x1d0 [kvm]\n vmx_handle_exit+0x149/0x610 [kvm_intel]\n kvm_arch_vcpu_ioctl_run+0xda8/0x1ac0 [kvm]\n kvm_vcpu_ioctl+0x244/0x8c0 [kvm]\n __x64_sys_ioctl+0x8a/0xd0\n do_syscall_64+0x5d/0xc60\n entry_SYSCALL_64_after_hwframe+0x4b/0x53\n \u003c/TASK\u003e"
}
],
"providerMetadata": {
"dateUpdated": "2026-05-11T21:41:03.028Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/a908eca437789589dd4624da428614c1275064dc"
},
{
"url": "https://git.kernel.org/stable/c/00338255bb1f422642fb2798ebe92e93b6e4209b"
},
{
"url": "https://git.kernel.org/stable/c/e0ce3ed1048a47986d15aef1a98ebda25560d257"
},
{
"url": "https://git.kernel.org/stable/c/ba35a5d775799ce5ad60230be97336f2fefd518e"
},
{
"url": "https://git.kernel.org/stable/c/3d3abf3f7e8b1abb082070a343de82d7efc80523"
},
{
"url": "https://git.kernel.org/stable/c/e7177c7e32cb806f348387b7f4faafd4a5b32054"
},
{
"url": "https://git.kernel.org/stable/c/3a062a5c55adc5507600b9ae6d911e247e2f1d6e"
},
{
"url": "https://git.kernel.org/stable/c/7366830642505683bbe905a2ba5d18d6e4b512b8"
},
{
"url": "https://git.kernel.org/stable/c/e750f85391286a4c8100275516973324b621a269"
}
],
"title": "KVM: x86: Don\u0027t (re)check L1 intercepts when completing userspace I/O",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2025-40026",
"datePublished": "2025-10-28T09:32:33.075Z",
"dateReserved": "2025-04-16T07:20:57.152Z",
"dateUpdated": "2026-05-11T21:41:03.028Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
CVE-2026-52993 (GCVE-0-2026-52993)
Vulnerability from cvelistv5 – Published: 2026-06-24 16:29 – Updated: 2026-07-24 12:05
VLAI
EPSS
VEX
Title
tipc: fix double-free in tipc_buf_append()
Summary
In the Linux kernel, the following vulnerability has been resolved:
tipc: fix double-free in tipc_buf_append()
tipc_msg_validate() can potentially reallocate the skb it is validating,
freeing the old one. In tipc_buf_append(), it was being called with a
pointer to a local variable which was a copy of the caller's skb
pointer.
If the skb was reallocated and validation subsequently failed, the error
handling path would free the original skb pointer, which had already
been freed, leading to double-free.
Fix this by checking if head now points to a newly allocated reassembled
skb. If it does, reassign *headbuf for later freeing operations.
Severity
9.8 (Critical)
CWE
- CWE-763 - Release of Invalid Pointer or Reference
Assigner
References
12 references
| URL | Tags |
|---|---|
| https://git.kernel.org/stable/c/a438975a6dcdbd708… | |
| https://git.kernel.org/stable/c/4ee4deadaae7cb2e3… | |
| https://git.kernel.org/stable/c/d3556656c6daebf8d… | |
| https://git.kernel.org/stable/c/0274f24485fc38032… | |
| https://git.kernel.org/stable/c/4d104882bc815d4ec… | |
| https://git.kernel.org/stable/c/1d5e589055880fae2… | |
| https://git.kernel.org/stable/c/29940fff14110ca48… | |
| https://git.kernel.org/stable/c/d293ca716e7d5dffd… | |
| https://access.redhat.com/security/cve/CVE-2026-52993 | vdb-entryx_refsource_REDHAT |
| https://bugzilla.redhat.com/show_bug.cgi?id=2492437 | issue-trackingx_refsource_REDHAT |
| https://security.access.redhat.com/data/csaf/v2/v… | x_sadp-csaf-vex |
| https://access.redhat.com/errata/RHSA-2026:45115 | vendor-advisoryx_refsource_REDHAT |
Impacted products
8 products
| Vendor | Product | Version | |
|---|---|---|---|
| Linux | Linux |
Affected:
d618d09a68e4eed7a435beb2e355250f6f40664a , < a438975a6dcdbd70865978c021650d1485586f0b
(git)
Affected: d618d09a68e4eed7a435beb2e355250f6f40664a , < 4ee4deadaae7cb2e3d53af0fc889cf92a73413c0 (git) Affected: d618d09a68e4eed7a435beb2e355250f6f40664a , < d3556656c6daebf8def751c7e71d11dd0a180d24 (git) Affected: d618d09a68e4eed7a435beb2e355250f6f40664a , < 0274f24485fc38032d4093e463dc3ff5c7a667c9 (git) Affected: d618d09a68e4eed7a435beb2e355250f6f40664a , < 4d104882bc815d4ec666ace9155f5f52715879a6 (git) Affected: d618d09a68e4eed7a435beb2e355250f6f40664a , < 1d5e589055880fae229e229e1929e087dbe08cf3 (git) Affected: d618d09a68e4eed7a435beb2e355250f6f40664a , < 29940fff14110ca48c5ccc168d121665b51bb778 (git) Affected: d618d09a68e4eed7a435beb2e355250f6f40664a , < d293ca716e7d5dffdaecaf6b9b2f857a33dc3d3a (git) |
|
| Linux | Linux |
Affected:
4.15
Unaffected: 0 , < 4.15 (semver) Unaffected: 5.10.258 , ≤ 5.10.* (semver) Unaffected: 5.15.209 , ≤ 5.15.* (semver) Unaffected: 6.1.175 , ≤ 6.1.* (semver) Unaffected: 6.6.141 , ≤ 6.6.* (semver) Unaffected: 6.12.91 , ≤ 6.12.* (semver) Unaffected: 6.18.33 , ≤ 6.18.* (semver) Unaffected: 7.0.10 , ≤ 7.0.* (semver) Unaffected: 7.1 , ≤ * (original_commit_for_fix) |
|
| Red Hat | Red Hat Enterprise Linux 8 |
Unaffected:
0:4.18.0-553.147.1.el8_10 , < *
(rpm)
cpe:/o:redhat:enterprise_linux:8 |
|
| Red Hat | Red Hat Enterprise Linux 10 |
cpe:/o:redhat:enterprise_linux:10 |
|
| Red Hat | Red Hat Enterprise Linux 6 |
cpe:/o:redhat:enterprise_linux:6 |
|
| Red Hat | Red Hat Enterprise Linux 7 |
cpe:/o:redhat:enterprise_linux:7 |
|
| Red Hat | Red Hat Enterprise Linux 8 |
cpe:/o:redhat:enterprise_linux:8 |
|
| Red Hat | Red Hat Enterprise Linux 9 |
cpe:/o:redhat:enterprise_linux:9 |
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CVE-2026-53059 (GCVE-0-2026-53059)
Vulnerability from cvelistv5 – Published: 2026-06-24 16:30 – Updated: 2026-07-24 12:05
VLAI
EPSS
VEX
Title
dm log: fix out-of-bounds write due to region_count overflow
Summary
In the Linux kernel, the following vulnerability has been resolved:
dm log: fix out-of-bounds write due to region_count overflow
The local variable region_count in create_log_context() is declared as
unsigned int (32-bit), but dm_sector_div_up() returns sector_t (64-bit).
When a device-mapper target has a sufficiently large ti->len with a small
region_size, the division result can exceed UINT_MAX. The truncated
value is then used to calculate bitset_size, causing clean_bits,
sync_bits, and recovering_bits to be allocated far smaller than needed
for the actual number of regions.
Subsequent log operations (log_set_bit, log_clear_bit, log_test_bit) use
region indices derived from the full untruncated region space, causing
out-of-bounds writes to kernel heap memory allocated by vmalloc.
This can be reproduced by creating a mirror target whose region_count
overflows 32 bits:
dmsetup create bigzero --table '0 8589934594 zero'
dmsetup create mymirror --table '0 8589934594 mirror \
core 2 2 nosync 2 /dev/mapper/bigzero 0 \
/dev/mapper/bigzero 0'
The status output confirms the truncation (sync_count=1 instead of
4294967297, because 0x100000001 was truncated to 1):
$ dmsetup status mymirror
0 8589934594 mirror 2 254:1 254:1 1/4294967297 ...
This leads to a kernel crash in core_in_sync:
BUG: scheduling while atomic: (udev-worker)/9150/0x00000000
RIP: 0010:core_in_sync+0x14/0x30 [dm_log]
CR2: 0000000000000008
Fixing recursive fault but reboot is needed!
Fix by widening the local region_count to sector_t and adding an
explicit overflow check before the value is assigned to lc->region_count.
Severity
6.3 (Medium)
CWE
- CWE-190 - Integer Overflow or Wraparound
Assigner
References
12 references
| URL | Tags |
|---|---|
| https://git.kernel.org/stable/c/44ab8875ae4a2842b… | |
| https://git.kernel.org/stable/c/defe483e47173768c… | |
| https://git.kernel.org/stable/c/3ec74da927b4e171a… | |
| https://git.kernel.org/stable/c/d4ac87567f86a55c3… | |
| https://git.kernel.org/stable/c/12bd5b88e91a02785… | |
| https://git.kernel.org/stable/c/b455903eed4558982… | |
| https://git.kernel.org/stable/c/4ec8323b9f0764a14… | |
| https://git.kernel.org/stable/c/c20e36b7631d83e75… | |
| https://access.redhat.com/security/cve/CVE-2026-53059 | vdb-entryx_refsource_REDHAT |
| https://bugzilla.redhat.com/show_bug.cgi?id=2492277 | issue-trackingx_refsource_REDHAT |
| https://security.access.redhat.com/data/csaf/v2/v… | x_sadp-csaf-vex |
| https://access.redhat.com/errata/RHSA-2026:45115 | vendor-advisoryx_refsource_REDHAT |
Impacted products
8 products
| Vendor | Product | Version | |
|---|---|---|---|
| Linux | Linux |
Affected:
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 44ab8875ae4a2842bde2d756bed195d375e0debb
(git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < defe483e47173768c227532694dc78cb65db5f09 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 3ec74da927b4e171a6fc0e77b1188ba4d019af51 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < d4ac87567f86a55c3c92e9a5144dcd943a9772a1 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 12bd5b88e91a02785244ff1d20fb157e96e9cdc8 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < b455903eed4558982be0811f5b7f44f6bbc4ff57 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 4ec8323b9f0764a14d532b1ae9b87f8a9fecb867 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < c20e36b7631d83e7535877f08af8b0af72c44b1a (git) |
|
| Linux | Linux |
Affected:
2.6.12
Unaffected: 0 , < 2.6.12 (semver) Unaffected: 5.10.258 , ≤ 5.10.* (semver) Unaffected: 5.15.209 , ≤ 5.15.* (semver) Unaffected: 6.1.175 , ≤ 6.1.* (semver) Unaffected: 6.6.141 , ≤ 6.6.* (semver) Unaffected: 6.12.91 , ≤ 6.12.* (semver) Unaffected: 6.18.33 , ≤ 6.18.* (semver) Unaffected: 7.0.10 , ≤ 7.0.* (semver) Unaffected: 7.1 , ≤ * (original_commit_for_fix) |
|
| Red Hat | Red Hat Enterprise Linux 8 |
Unaffected:
0:4.18.0-553.147.1.el8_10 , < *
(rpm)
cpe:/o:redhat:enterprise_linux:8 |
|
| Red Hat | Red Hat Enterprise Linux 10 |
cpe:/o:redhat:enterprise_linux:10 |
|
| Red Hat | Red Hat Enterprise Linux 6 |
cpe:/o:redhat:enterprise_linux:6 |
|
| Red Hat | Red Hat Enterprise Linux 7 |
cpe:/o:redhat:enterprise_linux:7 |
|
| Red Hat | Red Hat Enterprise Linux 8 |
cpe:/o:redhat:enterprise_linux:8 |
|
| Red Hat | Red Hat Enterprise Linux 9 |
cpe:/o:redhat:enterprise_linux:9 |
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndm log: fix out-of-bounds write due to region_count overflow\n\nThe local variable region_count in create_log_context() is declared as\nunsigned int (32-bit), but dm_sector_div_up() returns sector_t (64-bit).\nWhen a device-mapper target has a sufficiently large ti-\u003elen with a small\nregion_size, the division result can exceed UINT_MAX. The truncated\nvalue is then used to calculate bitset_size, causing clean_bits,\nsync_bits, and recovering_bits to be allocated far smaller than needed\nfor the actual number of regions.\n\nSubsequent log operations (log_set_bit, log_clear_bit, log_test_bit) use\nregion indices derived from the full untruncated region space, causing\nout-of-bounds writes to kernel heap memory allocated by vmalloc.\n\nThis can be reproduced by creating a mirror target whose region_count\noverflows 32 bits:\n\n dmsetup create bigzero --table \u00270 8589934594 zero\u0027\n dmsetup create mymirror --table \u00270 8589934594 mirror \\\n core 2 2 nosync 2 /dev/mapper/bigzero 0 \\\n /dev/mapper/bigzero 0\u0027\n\nThe status output confirms the truncation (sync_count=1 instead of\n4294967297, because 0x100000001 was truncated to 1):\n\n $ dmsetup status mymirror\n 0 8589934594 mirror 2 254:1 254:1 1/4294967297 ...\n\nThis leads to a kernel crash in core_in_sync:\n\n BUG: scheduling while atomic: (udev-worker)/9150/0x00000000\n RIP: 0010:core_in_sync+0x14/0x30 [dm_log]\n CR2: 0000000000000008\n Fixing recursive fault but reboot is needed!\n\nFix by widening the local region_count to sector_t and adding an\nexplicit overflow check before the value is assigned to lc-\u003eregion_count."
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}
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Trend slope:
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(linear fit over daily sighting counts)
Show additional events:
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
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.
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