ALSA: timer: Fix UAF at snd_timer_user_params()

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Summary

CVECVE-2026-53192
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-25 09:16:36 UTC
Updated2026-07-06 12:37:12 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: ALSA: timer: Fix UAF at snd_timer_user_params() At releasing a timer object, e.g. when a userspace timer (CONFIG_SND_UTIMER) gets closed and snd_timer_free() is called, it tries to detach the timer instances and release the resources. However, it's still possible that other in-flight tasks are holding the timer instance where the to-be-deleted timer object is associated, and this may lead to racy accesses. Fortunately, most of ioctls dealing with the timer instance list already have the protection with register_mutex, and this also avoids such races. But, SNDRV_TIMER_IOCTL_PARAMS isn't protected, hence the concurrent ioctl may lead to use-after-free. This patch just adds the guard with register_mutex to protect snd_timer_user_params() for covering the code path as a quick workaround. It's no hot-path but rather a rarely issued ioctl, so the performance penalty doesn't matter.

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

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

EPSS: 0.001340000 probability, percentile 0.032490000 (date 2026-07-04)

Problem Types: CWE-416

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 37745918e0e7575bc40f38da93a99b9fa6406224 38034d04d4a75bbca01df2b313ced0bcd0fa3242 git Not specified
CNA Linux Linux affected 37745918e0e7575bc40f38da93a99b9fa6406224 3d39da65b5c422c5e5afb7d5651b0698d060a827 git Not specified
CNA Linux Linux affected 37745918e0e7575bc40f38da93a99b9fa6406224 306427adf9b97e29e5958cb9cf3096c6151fc9ff git Not specified
CNA Linux Linux affected 37745918e0e7575bc40f38da93a99b9fa6406224 053a401b592be424fea9d57c789f66cd5d8cec11 git Not specified
CNA Linux Linux affected 6.12 Not specified
CNA Linux Linux unaffected 6.12 semver Not specified
CNA Linux Linux unaffected 6.12.94 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.36 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.13 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/053a401b592be424fea9d57c789f66cd5d8cec11 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/306427adf9b97e29e5958cb9cf3096c6151fc9ff 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/3d39da65b5c422c5e5afb7d5651b0698d060a827 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/38034d04d4a75bbca01df2b313ced0bcd0fa3242 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/117743d62e1225e208568a3ffc2c07214f1347cb MITRE git.kernel.org
git.kernel.org/stable/c/92ad2d7f80cad43b046f093e808e11fe919d304a MITRE git.kernel.org
git.kernel.org/stable/c/b2214914e461d0466548a52dfe4f4ee8ce362276 MITRE git.kernel.org
git.kernel.org/stable/c/e2331730175f74169046d2af8db1b47243df7c7a MITRE git.kernel.org
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