Vulnerability-Lookup

alsa-2026:54343

Vulnerability from osv_almalinux

Published

2026-08-12 00:00

Modified

2026-08-14 10:45

Summary

Important: kernel security, bug fix, and enhancement update

Details

The kernel packages contain the Linux kernel, the core of any Linux operating system.

Security Fix(es):

kernel: accel/ivpu: Fix signed integer truncation in IPC receive (CVE-2026-53202)
kernel: net/sched: act_api: use RCU with deferred freeing for action lifecycle (CVE-2026-53264)
kernel: scsi: target: iscsi: Bound iscsi_encode_text_output() appends to rsp_buf (CVE-2026-63887)
kernel: perf/aux: Fix page UAF in map_range() (CVE-2026-64300)
kernel: af_unix: set gc_in_progress to true in unix_gc() (CVE-2026-53361)

Bug Fix(es) and Enhancement(s):

netfilter: CVE backports for AlmaLinux 10.2.z (JIRA:AlmaLinux-185311)
tlbflush - Windows Driver Verifier catches FLTMGR/Ntfs crashes during KVM 42-VM soak test on AMD EPYC Turin [almalinux-10.2.z] (JIRA:AlmaLinux-214436)

For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

References

URL

Type

	https://access.redhat.com/errata/RHSA-2026:54343	ADVISORY
	https://access.redhat.com/security/cve/CVE-2026-53202	REPORT
	https://access.redhat.com/security/cve/CVE-2026-53264	REPORT
	https://access.redhat.com/security/cve/CVE-2026-63887	REPORT
	https://access.redhat.com/security/cve/CVE-2026-64300	REPORT
	https://bugzilla.redhat.com/2492823	REPORT
	https://bugzilla.redhat.com/2492851	REPORT
	https://bugzilla.redhat.com/2502447	REPORT
	https://bugzilla.redhat.com/2507040	REPORT
	https://errata.almalinux.org/10/ALSA-2026-54343.html	ADVISORY

JSON

To clipboard

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  "details": "The kernel packages contain the Linux kernel, the core of any Linux operating system.  \n\nSecurity Fix(es):  \n\n  * kernel: accel/ivpu: Fix signed integer truncation in IPC receive (CVE-2026-53202)\n  * kernel: net/sched: act_api: use RCU with deferred freeing for action lifecycle (CVE-2026-53264)\n  * kernel: scsi: target: iscsi: Bound iscsi_encode_text_output() appends to rsp_buf (CVE-2026-63887)\n  * kernel: perf/aux: Fix page UAF in map_range() (CVE-2026-64300)\n  * kernel: af_unix: set gc_in_progress to true in unix_gc() (CVE-2026-53361)\n\n\nBug Fix(es) and Enhancement(s):  \n\n  * netfilter: CVE backports for AlmaLinux 10.2.z (JIRA:AlmaLinux-185311)\n  * tlbflush - Windows Driver Verifier catches FLTMGR/Ntfs crashes during KVM 42-VM soak test on AMD EPYC Turin [almalinux-10.2.z] (JIRA:AlmaLinux-214436)\n\n\nFor more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.\n",
  "id": "ALSA-2026:54343",
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CVE-2026-53202 (GCVE-0-2026-53202)

Vulnerability from cvelistv5 – Published: 2026-06-25 08:39 – Updated: 2026-08-14 12:04

Title

accel/ivpu: Fix signed integer truncation in IPC receive

Summary

In the Linux kernel, the following vulnerability has been resolved: accel/ivpu: Fix signed integer truncation in IPC receive Fix potential buffer overflow where firmware-supplied data_size is cast to signed int before being used in min_t(). Large unsigned values (>= 0x80000000) become negative, causing unsigned wraparound and oversized memcpy operations that can overflow the stack buffer. Change min_t(int, ...) to min() as both values are unsigned and can be handled by min() without explicit cast.

Severity

7.8 (High)


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

7 (High)


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

CWE

CWE-787 - Out-of-bounds Write

Assigner

Linux

References

9 references

URL	Tags
https://git.kernel.org/stable/c/4788556d4dd9d7170…
https://git.kernel.org/stable/c/45cb105b8642c65e9…
https://git.kernel.org/stable/c/2821bf2b79e47f87e…
https://git.kernel.org/stable/c/d9faef564438d1e45…
https://access.redhat.com/security/cve/CVE-2026-53202	vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2492823	issue-trackingx_refsource_REDHAT
https://security.access.redhat.com/data/csaf/v2/v…	x_sadp-csaf-vex
https://access.redhat.com/errata/RHSA-2026:54343	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:54443	vendor-advisoryx_refsource_REDHAT

Impacted products

8 products

Vendor	Product	Version
Linux	Linux	Affected: 3b434a3445fff3149128db0169da864d67057325 , < 4788556d4dd9d717037e385de178974e9649231d (git) Affected: 3b434a3445fff3149128db0169da864d67057325 , < 45cb105b8642c65e9be286f7058e92314efe7ea3 (git) Affected: 3b434a3445fff3149128db0169da864d67057325 , < 2821bf2b79e47f87e1dbdd9d25c78240965a97d6 (git) Affected: 3b434a3445fff3149128db0169da864d67057325 , < d9faef564438d1e4579c692c046603e7ada7bdf4 (git)
Linux	Linux	Affected: 6.8 Unaffected: 0 , < 6.8 (semver) Unaffected: 6.12.94 , ≤ 6.12.* (semver) Unaffected: 6.18.36 , ≤ 6.18.* (semver) Unaffected: 7.0.13 , ≤ 7.0.* (semver) Unaffected: 7.1 , ≤ * (original_commit_for_fix)
Red Hat	Red Hat Enterprise Linux 10	Unaffected: 0:6.12.0-211.47.1.el10_2 , < * (rpm) cpe:/o:redhat:enterprise_linux:10.2
Red Hat	Red Hat Enterprise Linux 9	Unaffected: 0:5.14.0-687.39.1.el9_8 , < * (rpm) cpe:/a:redhat:enterprise_linux:9 cpe:/o:redhat:enterprise_linux:9
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-2026-53264 (GCVE-0-2026-53264)

Vulnerability from cvelistv5 – Published: 2026-06-25 08:39 – Updated: 2026-08-05 12:34

Title

net/sched: act_api: use RCU with deferred freeing for action lifecycle

Summary

In the Linux kernel, the following vulnerability has been resolved: net/sched: act_api: use RCU with deferred freeing for action lifecycle When NEWTFILTER and DELFILTER are run concurrently it is possible to create a race with an associated action. Let's illustrate with CPU0 running NEWTFILTER and CPU1 running DELFILTER: 0: mutex_lock() <-- holds the idr lock 0: rcu_read_lock() 0: p = idr_find(idr, index) <-- action p is valid (RCU protects IDR) 0: mutex_unlock() <-- releases the idr lock 1: refcount_dec_and_mutex_lock() <-- refcnt 1->0, mutex held 1: idr_remove(idr, index) <-- Action removed from IDR 1: mutex_unlock() <-- mutex released allowing us to delete the action 1: tcf_action_cleanup(p); kfree(p) <-- Kfrees p immediately, no deferral 0: refcount_inc_not_zero(&p->tcfa_refcnt) <-- ouch, UAF p points to freed memory This patch fixes the race condition between NEWTFILTER and DELFILTER by adding struct rcu_head to tc_action used in the deferral and introducing a call_rcu() in the delete path to defer the final kfree(). Note: this is a revert of commit d7fb60b9cafb ("net_sched: get rid of tcfa_rcu") but also modernization/simplification to directly use kfree_rcu(). Let's illustrate the new restored code path: 0: rcu_read_lock() 1: refcount_dec_and_mutex_lock() <-- refcnt 1->0, mutex held 1: idr_remove(idr, index) 1: mutex_unlock() 1: call_rcu(&p->tcfa_rcu, tcf_action_rcu_free) <-- defer kfree after grace period 0: p = idr_find(idr, index) 0: refcount_inc_not_zero(&p->tcfa_refcnt) <-- fails, refcnt already 0 1: rcu_read_unlock() <-- release so freeing can run after grace period After CPU1 calls idr_remove(), the object is no longer reachable through the IDR. CPU0's subsequent idr_find() will return NULL, and even if it still held a stale pointer, the immediate kfree() is now deferred until after the RCU grace period, so no UAF can occur.

Severity

7.8 (High)


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

SSVC

Exploitation: poc Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-07-29 03:55 UTC

CWE

CWE-416 - Use After Free

Assigner

Linux

References

9 references

URL	Tags
https://git.kernel.org/stable/c/98b2e40879abf0245…
https://git.kernel.org/stable/c/18af5d2ef0c4f6578…
https://git.kernel.org/stable/c/1f1b98fea6b9ea305…
https://git.kernel.org/stable/c/8b136f18ac4b2ace5…
https://git.kernel.org/stable/c/5dd51e09020c65aa5…
https://git.kernel.org/stable/c/b60e9391142e983fa…
https://git.kernel.org/stable/c/91d105d2cbe002f9c…
https://git.kernel.org/stable/c/5057e1aca011e51ef…
https://starlabs.sg/blog/2026/07-when-ai-makes-0-…	exploit

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: d7fb60b9cafb982cb2e46a267646a8dfd4f2e5da , < 98b2e40879abf0245be5a5b7af69e0f6ff524ac3 (git) Affected: d7fb60b9cafb982cb2e46a267646a8dfd4f2e5da , < 18af5d2ef0c4f65787fd1280c8b23286b9f2a835 (git) Affected: d7fb60b9cafb982cb2e46a267646a8dfd4f2e5da , < 1f1b98fea6b9ea30507d0f2fbff6750292d097e2 (git) Affected: d7fb60b9cafb982cb2e46a267646a8dfd4f2e5da , < 8b136f18ac4b2ace5aaad3305b3f8a5d8165a009 (git) Affected: d7fb60b9cafb982cb2e46a267646a8dfd4f2e5da , < 5dd51e09020c65aa53cf128e5e3517cd53b3c113 (git) Affected: d7fb60b9cafb982cb2e46a267646a8dfd4f2e5da , < b60e9391142e983fab2be53497aa8f71fdd09cd5 (git) Affected: d7fb60b9cafb982cb2e46a267646a8dfd4f2e5da , < 91d105d2cbe002f9c7b43a6183adedc37e1da1f7 (git) Affected: d7fb60b9cafb982cb2e46a267646a8dfd4f2e5da , < 5057e1aca011e51ef51498c940ef96f3d3e8a305 (git)
Linux	Linux	Affected: 4.14 Unaffected: 0 , < 4.14 (semver) Unaffected: 5.10.259 , ≤ 5.10.* (semver) Unaffected: 5.15.210 , ≤ 5.15.* (semver) Unaffected: 6.1.176 , ≤ 6.1.* (semver) Unaffected: 6.6.143 , ≤ 6.6.* (semver) Unaffected: 6.12.94 , ≤ 6.12.* (semver) Unaffected: 6.18.36 , ≤ 6.18.* (semver) Unaffected: 7.0.13 , ≤ 7.0.* (semver) Unaffected: 7.1 , ≤ * (original_commit_for_fix)

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    "cveId": "CVE-2026-53264",
    "datePublished": "2026-06-25T08:39:51.870Z",
    "dateReserved": "2026-06-09T07:44:35.395Z",
    "dateUpdated": "2026-08-05T12:34:41.215Z",
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CVE-2026-53361 (GCVE-0-2026-53361)

Vulnerability from cvelistv5 – Published: 2026-07-04 11:54 – Updated: 2026-08-05 12:35

Title

af_unix: Set gc_in_progress to true in unix_gc().

Summary

In the Linux kernel, the following vulnerability has been resolved: af_unix: Set gc_in_progress to true in unix_gc(). Igor Ushakov reported that unix_gc() could run with gc_in_progress being false if the work is scheduled while running: Thread 1 Thread 2 Thread 3 -------- -------- -------- unix_schedule_gc() unix_schedule_gc() `- if (!gc_in_progress) `- if (!gc_in_progress) |- gc_in_progress = true | `- queue_work() | unix_gc() <----------------/ | | |- gc_in_progress = true ... `- queue_work() | | `- gc_in_progress = false | | unix_gc() <---------------------------------------------' | ... /* gc_in_progress == false */ | `- gc_in_progress = false unix_peek_fpl() relies on gc_in_progress not to confuse GC by MSG_PEEK. Let's set gc_in_progress to true in unix_gc().

Severity

7.1 (High)


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

Assigner

Linux

References

4 references

URL	Tags
https://git.kernel.org/stable/c/82c17e13d404f686e…
https://git.kernel.org/stable/c/591f1ac217428a6d2…
https://git.kernel.org/stable/c/0cfa78c050662784f…
https://git.kernel.org/stable/c/d82ba05263c69fa24…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 328840c93bd6a4871dd10908d01b41eab83eb8e2 , < 82c17e13d404f686e164590483fd6c1abaa675d0 (git) Affected: 8b90a9f819dc2a06baae4ec1a64d875e53b824ec , < 591f1ac217428a6d2b32a8ac14aac0fab44f155a (git) Affected: 8b90a9f819dc2a06baae4ec1a64d875e53b824ec , < 0cfa78c050662784fc8e3ab26dbfd1dc632b2082 (git) Affected: 8b90a9f819dc2a06baae4ec1a64d875e53b824ec , < d82ba05263c69fa2437fe93e4e561cc40f4c03af (git) Affected: ceb8bd6c69c1680fd9b45e7f16d7170c9c7513a5 (git) Affected: 6.6.93 , < 6.6.144 (semver) Affected: 6.1.141 , < 6.2 (semver)
Linux	Linux	Affected: 6.9 Unaffected: 0 , < 6.9 (semver) Unaffected: 6.6.144 , ≤ 6.6.* (semver) Unaffected: 6.12.95 , ≤ 6.12.* (semver) Unaffected: 6.18.38 , ≤ 6.18.* (semver) Unaffected: 7.1 , ≤ * (original_commit_for_fix)

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JSON

To clipboard

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              "value": "AV:L - The vulnerable AF_UNIX garbage-collection path is reached through local socket syscalls such as socketpair(), sendmsg() with SCM_RIGHTS, recvmsg(MSG_PEEK), and close(). It is not reachable directly from network packets.\nAC:L - Although this is a race, the attacker can control the relevant operations by creating AF_UNIX FD cycles, issuing concurrent GC-triggering sends, peeking, and closing sockets. No victim timing or external condition is required beyond scheduler interleaving.\nPR:L - The path is available to an unprivileged local user through ordinary AF_UNIX sockets and SCM_RIGHTS; there is no capability check for socket creation, FD passing, or MSG_PEEK. It still requires local code execution, so privileges are Low rather than None.\nUI:N - No victim interaction is required once the local attacker can run code. The attacker can create the sockets, pass FDs, trigger GC, and race MSG_PEEK independently.\nS:U - The impact remains within the kernel/local IPC security authority. This is not a VM escape, IOMMU bypass, or other cross-scope boundary violation.\nC:N - The bug causes stale GC liveness decisions and purging of live AF_UNIX receive queues, but I did not find a new arbitrary read or unintended disclosure primitive. MSG_PEEK-visible descriptors are already exposed to the receiving endpoint by design.\nI:H - The race can make GC incorrectly collect a live AF_UNIX SCC and purge live receive queues, dropping queued data and SCM_RIGHTS file descriptors. That is unauthorized corruption/destruction of kernel-maintained IPC state, so integrity impact is High.\nA:H - The attacker can repeatedly cause live AF_UNIX sockets to lose queued messages and passed FDs, breaking IPC semantics and potentially denying service to affected local components. Under the required higher-severity rule, this supports High availability impact."
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CVE-2026-63887 (GCVE-0-2026-63887)

Vulnerability from cvelistv5 – Published: 2026-07-19 14:55 – Updated: 2026-08-05 12:36

Title

scsi: target: iscsi: Bound iscsi_encode_text_output() appends to rsp_buf

Summary

In the Linux kernel, the following vulnerability has been resolved: scsi: target: iscsi: Bound iscsi_encode_text_output() appends to rsp_buf iscsi_encode_text_output() concatenates "key=value\0" records into login->rsp_buf, an 8192-byte kzalloc(MAX_KEY_VALUE_PAIRS) buffer allocated in iscsit_alloc_login_setup_buffer(). The three sprintf() call sites in this function (lines 1398, 1411, 1424 in v7.1-rc2) never check the remaining buffer capacity: *length += sprintf(output_buf, "%s=%s", er->key, er->value); *length += 1; output_buf = textbuf + *length; The 8192-byte ceiling at iscsi_target_check_login_request() bounds the *input* Login PDU payload, but a single PDU can carry up to 2048 minimal four-byte "a=b\0" pairs, each unknown key expanding to a 16-byte "a=NotUnderstood\0" output record via iscsi_add_notunderstood_response(). 2048 * 16 = 32 KiB of output into an 8 KiB buffer, producing a ~24 KiB heap overrun in the kmalloc-8k slab. The fix introduces a static iscsi_encode_text_record() helper that uses snprintf() with a per-call bounds check against the remaining buffer, and threads a u32 textbuf_size parameter through iscsi_encode_text_output(). Both call sites in iscsi_target_handle_csg_zero() (PHASE_SECURITY) and iscsi_target_handle_csg_one() (PHASE_OPERATIONAL) pass MAX_KEY_VALUE_PAIRS. On overflow the encoder logs the condition, calls iscsi_release_extra_responses() to drop queued records, and returns -1; both caller sites now emit ISCSI_STATUS_CLS_INITIATOR_ERR / ISCSI_LOGIN_STATUS_INIT_ERR via iscsit_tx_login_rsp() before returning, so the initiator sees an explicit failed-login response rather than a silent connection drop. (Prior to this patch only the PHASE_OPERATIONAL caller did that; the PHASE_SECURITY caller is converted to the same shape.)

Severity

9.8 (Critical)


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

Assigner

Linux

References

8 references

URL	Tags
https://git.kernel.org/stable/c/cb84e974fb172bc71…
https://git.kernel.org/stable/c/b19382dfc6e7dee6d…
https://git.kernel.org/stable/c/efe633e600a0ac683…
https://git.kernel.org/stable/c/4e9f0c4a645c995bc…
https://git.kernel.org/stable/c/30bf335e8fe170322…
https://git.kernel.org/stable/c/594a40360012ce5f9…
https://git.kernel.org/stable/c/26e4a304b7e6f1338…
https://git.kernel.org/stable/c/bf33e01f88388c43e…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: e48354ce078c079996f89d715dfa44814b4eba01 , < cb84e974fb172bc71386289f37b78ea679410b39 (git) Affected: e48354ce078c079996f89d715dfa44814b4eba01 , < b19382dfc6e7dee6d3859ba44b6ca29e97a51627 (git) Affected: e48354ce078c079996f89d715dfa44814b4eba01 , < efe633e600a0ac68357206fede21b1ac8178f3b8 (git) Affected: e48354ce078c079996f89d715dfa44814b4eba01 , < 4e9f0c4a645c995bc75c06c7b3644254ffb4c76b (git) Affected: e48354ce078c079996f89d715dfa44814b4eba01 , < 30bf335e8fe170322080ee001f05ca29c50680b3 (git) Affected: e48354ce078c079996f89d715dfa44814b4eba01 , < 594a40360012ce5f94c715d5e3b20fa3af7d525a (git) Affected: e48354ce078c079996f89d715dfa44814b4eba01 , < 26e4a304b7e6f1338c675d527608d32549c091db (git) Affected: e48354ce078c079996f89d715dfa44814b4eba01 , < bf33e01f88388c43e285492a63e539df6ffed64c (git)
Linux	Linux	Affected: 3.1 Unaffected: 0 , < 3.1 (semver) Unaffected: 5.10.259 , ≤ 5.10.* (semver) Unaffected: 5.15.210 , ≤ 5.15.* (semver) Unaffected: 6.1.176 , ≤ 6.1.* (semver) Unaffected: 6.6.143 , ≤ 6.6.* (semver) Unaffected: 6.12.93 , ≤ 6.12.* (semver) Unaffected: 6.18.35 , ≤ 6.18.* (semver) Unaffected: 7.0.12 , ≤ 7.0.* (semver) Unaffected: 7.1 , ≤ * (original_commit_for_fix)

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JSON

To clipboard

{
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                  "versionEndExcluding": "7.0.12",
                  "versionStartIncluding": "3.1",
                  "vulnerable": true
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: target: iscsi: Bound iscsi_encode_text_output() appends to rsp_buf\n\niscsi_encode_text_output() concatenates \"key=value\\0\" records into\nlogin-\u003ersp_buf, an 8192-byte kzalloc(MAX_KEY_VALUE_PAIRS) buffer\nallocated in iscsit_alloc_login_setup_buffer(). The three sprintf() call\nsites in this function (lines 1398, 1411, 1424 in v7.1-rc2) never check\nthe remaining buffer capacity:\n\n\t*length += sprintf(output_buf, \"%s=%s\", er-\u003ekey, er-\u003evalue);\n\t*length += 1;\n\toutput_buf = textbuf + *length;\n\nThe 8192-byte ceiling at iscsi_target_check_login_request() bounds the\n*input* Login PDU payload, but a single PDU can carry up to 2048 minimal\nfour-byte \"a=b\\0\" pairs, each unknown key expanding to a 16-byte\n\"a=NotUnderstood\\0\" output record via iscsi_add_notunderstood_response().\n2048 * 16 = 32 KiB of output into an 8 KiB buffer, producing a ~24 KiB\nheap overrun in the kmalloc-8k slab.\n\nThe fix introduces a static iscsi_encode_text_record() helper that uses\nsnprintf() with a per-call bounds check against the remaining buffer,\nand threads a u32 textbuf_size parameter through\niscsi_encode_text_output(). Both call sites in\niscsi_target_handle_csg_zero() (PHASE_SECURITY) and\niscsi_target_handle_csg_one() (PHASE_OPERATIONAL) pass\nMAX_KEY_VALUE_PAIRS. On overflow the encoder logs the condition, calls\niscsi_release_extra_responses() to drop queued records, and returns -1;\nboth caller sites now emit ISCSI_STATUS_CLS_INITIATOR_ERR /\nISCSI_LOGIN_STATUS_INIT_ERR via iscsit_tx_login_rsp() before returning,\nso the initiator sees an explicit failed-login response rather than a\nsilent connection drop. (Prior to this patch only the PHASE_OPERATIONAL\ncaller did that; the PHASE_SECURITY caller is converted to the same\nshape.)"
        }
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      "metrics": [
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          "cvssV3_1": {
            "baseScore": 9.8,
            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
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              "value": "AV:N - The Linux iSCSI target (LIO) is an in-kernel SCSI target that accepts remote TCP connections on the iSCSI portal (typically port 3260); crafted Login PDUs reach the vulnerable encoder via the normal network receive and login-negotiation path.\nAC:L - Once an iSCSI target portal is reachable, an attacker can reliably trigger the overflow by sending a single Login PDU packed with unknown key=value pairs; no races or victim-dependent timing are required.\nPR:N - The heap overflow occurs during login negotiation before iSCSI authentication completes; a discovery-session login requires only InitiatorName and SessionType with no credentials, initiator ACL, or local privileges.\nUI:N - Exploitation requires only network packets sent by the attacker; no action from a legitimate user or administrator is needed beyond the target already exposing its iSCSI portal.\nS:U - The corruption is confined to kernel heap memory in the iSCSI target/login context and does not cross a VM, container, or IOMMU security boundary by itself.\nC:H - A ~24 KiB out-of-bounds write into the kmalloc-8k slab can corrupt adjacent kernel objects and be leveraged for arbitrary memory disclosure, not merely a bounded leak.\nI:H - The unbounded sprintf heap overrun is a large out-of-bounds write that can corrupt adjacent heap metadata or objects to achieve arbitrary kernel memory modification and potential code execution.\nA:H - Corrupting kmalloc-8k heap objects during login response encoding can cause kernel oops, BUG, or panic, and the attack can be repeated against an exposed iSCSI target."
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        "dateUpdated": "2026-08-05T12:36:56.451Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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          "url": "https://git.kernel.org/stable/c/b19382dfc6e7dee6d3859ba44b6ca29e97a51627"
        },
        {
          "url": "https://git.kernel.org/stable/c/efe633e600a0ac68357206fede21b1ac8178f3b8"
        },
        {
          "url": "https://git.kernel.org/stable/c/4e9f0c4a645c995bc75c06c7b3644254ffb4c76b"
        },
        {
          "url": "https://git.kernel.org/stable/c/30bf335e8fe170322080ee001f05ca29c50680b3"
        },
        {
          "url": "https://git.kernel.org/stable/c/594a40360012ce5f94c715d5e3b20fa3af7d525a"
        },
        {
          "url": "https://git.kernel.org/stable/c/26e4a304b7e6f1338c675d527608d32549c091db"
        },
        {
          "url": "https://git.kernel.org/stable/c/bf33e01f88388c43e285492a63e539df6ffed64c"
        }
      ],
      "title": "scsi: target: iscsi: Bound iscsi_encode_text_output() appends to rsp_buf",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-63887",
    "datePublished": "2026-07-19T14:55:00.114Z",
    "dateReserved": "2026-07-19T07:54:57.018Z",
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CVE-2026-64300 (GCVE-0-2026-64300)

Vulnerability from cvelistv5 – Published: 2026-07-25 08:49 – Updated: 2026-08-05 12:40

Title

perf/aux: Fix page UAF in map_range()

Summary

In the Linux kernel, the following vulnerability has been resolved: perf/aux: Fix page UAF in map_range() map_range() reads rb->aux_pages[], rb->aux_nr_pages and rb->aux_pgoff via perf_mmap_to_page() while holding only event->mmap_mutex. Those fields are serialized by rb->aux_mutex, and mmap_mutex is per event. Thus, two events sharing one rb via PERF_EVENT_IOC_SET_OUTPUT can race rb_alloc_aux() with map_range(), leading to a page-UAF scenario as follows: CPU 0 CPU 1 ===== ===== rb_alloc_aux() map_range() [1]: allocate rb->aux_pages[0] [2]: rb->aux_nr_pages++ [3]: perf_mmap_to_page() returns rb->aux_pages[0] [4]: map it as VM_PFNMAP [5]: rb->aux_pgoff = 1 munmap the page [6]: free rb->aux_pages[0] Pages mapped as VM_PFNMAP have no refcount protection, so CPU 1 holds a mapping to a freed physical frame. Fix this by taking rb->aux_mutex across the page walk in map_range().

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

3 references

URL	Tags
https://git.kernel.org/stable/c/c8b7e113f7b61eef2…
https://git.kernel.org/stable/c/0cff05bd2186020f8…
https://git.kernel.org/stable/c/5948aaf64f81f217a…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: b709eb872e19a19607bbb6d2975bc264d59735cf , < c8b7e113f7b61eef2f017e6329c27c2331058c5a (git) Affected: b709eb872e19a19607bbb6d2975bc264d59735cf , < 0cff05bd2186020f8706233e261016d149cc24db (git) Affected: b709eb872e19a19607bbb6d2975bc264d59735cf , < 5948aaf64f81f217a25dcc2bf6c0779bca19566c (git)
Linux	Linux	Affected: 6.14 Unaffected: 0 , < 6.14 (semver) Unaffected: 6.18.39 , ≤ 6.18.* (semver) Unaffected: 7.1.4 , ≤ 7.1.* (semver) Unaffected: 7.2-rc3 , ≤ * (original_commit_for_fix)

Show details on NVD website

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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nperf/aux: Fix page UAF in map_range()\n\nmap_range() reads rb-\u003eaux_pages[], rb-\u003eaux_nr_pages and rb-\u003eaux_pgoff via\nperf_mmap_to_page() while holding only event-\u003emmap_mutex. Those fields are\nserialized by rb-\u003eaux_mutex, and mmap_mutex is per event.\n\nThus, two events sharing one rb via PERF_EVENT_IOC_SET_OUTPUT can race\nrb_alloc_aux() with map_range(), leading to a page-UAF scenario as follows:\n\n  CPU 0                           CPU 1\n  =====                           =====\n  rb_alloc_aux()                  map_range()\n  [1]: allocate rb-\u003eaux_pages[0]\n  [2]: rb-\u003eaux_nr_pages++\n                                  [3]: perf_mmap_to_page()\n                                         returns rb-\u003eaux_pages[0]\n                                  [4]: map it as VM_PFNMAP\n  [5]: rb-\u003eaux_pgoff = 1\n\n  munmap the page\n  [6]: free rb-\u003eaux_pages[0]\n\nPages mapped as VM_PFNMAP have no refcount protection, so CPU 1 holds a\nmapping to a freed physical frame.\n\nFix this by taking rb-\u003eaux_mutex across the page walk in map_range()."
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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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.

Action not permitted

alsa-2026:54343

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CVE-2026-63887 (GCVE-0-2026-63887)

CVE-2026-64300 (GCVE-0-2026-64300)

Tags

Sightings

Nomenclature