Skip to main content

Linux Kernel EUVDEUVD-2026-39283

| CVE-2026-53192 HIGH
Use After Free (CWE-416)
2026-06-25 416baaa9-dc9f-4396-8d5f-8c081fb06d67 GHSA-jmf6-3v74-7x28
Information Disclosure Linux Use After Free Memory Corruption Red Hat Suse
7.8
CVSS 3.1 · Vendor: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Share

Severity by source

Vendor (416baaa9-dc9f-4396-8d5f-8c081fb06d67) PRIMARY
7.8 HIGH
AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
vuln.today AI
7.0 HIGH

Local device access with low privilege (AV:L/PR:L); AC:H because winning the use-after-free timing race is probabilistic; high C/I/A from potential kernel memory corruption and escalation.

3.1 AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
4.0 AV:L/AC:H/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
SUSE
5.5 MEDIUM
AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Red Hat
7.0 MEDIUM
qualitative

Primary rating from Vendor (416baaa9-dc9f-4396-8d5f-8c081fb06d67).

CVSS VectorVendor: 416baaa9-dc9f-4396-8d5f-8c081fb06d67

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

Lifecycle Timeline

5
Analysis Generated
Jun 28, 2026 - 09:28 vuln.today
CVSS changed
Jun 28, 2026 - 08:22 NVD
7.8 (HIGH)
Patch available
Jun 25, 2026 - 10:32 EUVD
CVE Published
Jun 25, 2026 - 09:16 cve.org
UNKNOWN (no severity yet)
CVE Published
Jun 25, 2026 - 09:16 cve.org
HIGH 7.8

DescriptionCVE.org

In 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.

AnalysisAI

Local privilege escalation or memory corruption in the Linux kernel's ALSA timer subsystem stems from a use-after-free in snd_timer_user_params() reachable via the SNDRV_TIMER_IOCTL_PARAMS ioctl. A low-privileged local user with access to a timer device (notably userspace timers under CONFIG_SND_UTIMER) can race a concurrent ioctl against timer object release to access freed memory. No public exploit identified at time of analysis, and EPSS is low (0.18%), reflecting the local-only, race-dependent nature of the bug.

Technical ContextAI

The flaw lives in the Advanced Linux Sound Architecture (ALSA) timer layer of the kernel sound stack. When a timer object is freed - for example when a userspace timer (CONFIG_SND_UTIMER) is closed and snd_timer_free() detaches instances and releases resources - other in-flight tasks may still hold a reference to a timer instance associated with the object. Most ALSA timer ioctls serialize access through register_mutex, but SNDRV_TIMER_IOCTL_PARAMS (handled by snd_timer_user_params()) lacked this lock, leaving a window where a concurrent ioctl operates on a freed instance. This is a classic use-after-free (CWE-416) caused by a missing lock around a teardown/use race; the fix wraps snd_timer_user_params() in register_mutex. The kernel CWE field is N/A in the feed, but the description ('UAF') makes CWE-416 the root-cause class.

RemediationAI

Vendor-released patch: update to a fixed stable kernel - 5.10.259, 5.15.210, 6.1.176, 6.6.143, 6.12.94, 6.18.36, 7.0.13 (or 7.1) or later, whichever matches your branch, via your distribution's kernel update channel. The upstream fix adds register_mutex protection to snd_timer_user_params(); the commits are available at git.kernel.org/stable (e.g., https://git.kernel.org/stable/c/92ad2d7f80cad43b046f093e808e11fe919d304a) and the NVD advisory at https://nvd.nist.gov/vuln/detail/CVE-2026-53192. If immediate patching is not possible, reduce the attack surface by restricting access to ALSA timer device nodes (/dev/snd/timer) to trusted groups rather than world-accessible, and consider disabling the userspace timer feature (CONFIG_SND_UTIMER) or unloading the snd-timer module where audio timing is not required - the trade-off is loss of ALSA timer functionality for applications (e.g., MIDI sequencing, some audio software) that depend on it.

Same weakness CWE-416 – Use After Free

View all
CVE-2019-0708 CRITICAL POC
9.8
CVE-2015-5119 CRITICAL POC
9.8
CVE-2014-0322 HIGH POC
8.8
CVE-2012-4792 HIGH POC
8.8
CVE-2009-4324 HIGH POC
7.8
CVE-2015-0313 CRITICAL POC
9.8
CVE-2015-5122 CRITICAL POC
9.8
CVE-2013-2551 HIGH POC
8.8

Same technique Information Disclosure

View all
CVE-2019-2725 CRITICAL POC
9.8
CVE-2021-34523 CRITICAL POC
9.0
CVE-2013-2251 CRITICAL POC
9.8
CVE-2017-5638 CRITICAL POC
9.8
CVE-2025-24813 CRITICAL POC
9.8
CVE-2015-1701 HIGH POC
7.8
CVE-2017-0147 HIGH POC
7.5
CVE-2014-6324 HIGH POC
8.8

Vendor StatusVendor

SUSE

Severity: Moderate
Product Status
Image SLES15-SP7-Azure-3P Image SLES15-SP7-Azure-Basic Image SLES15-SP7-Azure-Standard Image SLES15-SP7-HPC-Azure Affected
Image SLES15-SP7-BYOS-Azure Image SLES15-SP7-BYOS-GCE Image SLES15-SP7-CHOST-BYOS-Aliyun Image SLES15-SP7-CHOST-BYOS-Azure Image SLES15-SP7-CHOST-BYOS-EC2 Image SLES15-SP7-CHOST-BYOS-GCE Image SLES15-SP7-CHOST-BYOS-GDC Image SLES15-SP7-CHOST-BYOS-SAP-CCloud Image SLES15-SP7-EC2 Image SLES15-SP7-EC2-ECS-HVM Image SLES15-SP7-GCE Image SLES15-SP7-HPC-BYOS-Azure Image SLES15-SP7-HPC-BYOS-EC2 Image SLES15-SP7-HPC-BYOS-GCE Image SLES15-SP7-Hardened-BYOS-Azure Image SLES15-SP7-Hardened-BYOS-EC2 Image SLES15-SP7-Hardened-BYOS-GCE Image SLES15-SP7-SAPCAL-Azure Image SLES15-SP7-SAPCAL-EC2 Image SLES15-SP7-SAPCAL-GCE Affected
Image SLES15-SP7-SAP-Azure Image SLES15-SP7-SAP-Azure-3P Image SLES15-SP7-SAP-BYOS-Azure Image SLES15-SP7-SAP-BYOS-EC2 Image SLES15-SP7-SAP-BYOS-GCE Image SLES15-SP7-SAP-EC2 Image SLES15-SP7-SAP-GCE Image SLES15-SP7-SAP-Hardened-Azure Image SLES15-SP7-SAP-Hardened-BYOS-Azure Image SLES15-SP7-SAP-Hardened-BYOS-EC2 Image SLES15-SP7-SAP-Hardened-BYOS-GCE Image SLES15-SP7-SAP-Hardened-GCE Affected
SUSE Linux Enterprise Desktop 15 SP7 Fixed
SUSE Linux Enterprise High Availability Extension 15 SP7 Fixed

Share

EUVD-2026-39283 vulnerability details – vuln.today
Back

This site uses cookies essential for authentication and security. No tracking or analytics cookies are used. Privacy Policy