CVE-2026-53192ALSA: timer: Fix UAF at snd_timer_user_params()
Updated under an hour ago ()
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It affects Linux and 2 other products. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Modified
- Record last updated
- Oct 16, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | 37745918e0e7575bc40f38da93a99b9fa6406224 builds before 38034d04d4a75bbca01df2b313ced0bcd0fa3242; 37745918e0e7575bc40f38da93a99b9fa6406224 builds before 3d39da65b5c422c5e5afb7d5651b0698d060a827; 37745918e0e7575bc40f38da93a99b9fa6406224 builds before 306427adf9b97e29e5958cb9cf3096c6151fc9ff; 37745918e0e7575bc40f38da93a99b9fa6406224 builds before 053a401b592be424fea9d57c789f66cd5d8cec11 | CNA record |
Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem siemens:simatic_s7_1500_tm_mfp_gnu_linux_subsystem (from the name) | all versions | CISA ADP |
linux linux_kernel linux:linux_kernel | from 6.12 before 6.12.94; from 6.13 before 6.18.36; from 6.19 before 7.0.13; 7.1; 7.1; 7.1; 7.1; 7.1; and 2 more ranges | NVD |
References
- https://git.kernel.org/stable/c/38034d04d4a75bbca01df2b313ced0bcd0fa3242patch
- https://git.kernel.org/stable/c/3d39da65b5c422c5e5afb7d5651b0698d060a827patch
- https://git.kernel.org/stable/c/306427adf9b97e29e5958cb9cf3096c6151fc9ffpatch
- https://git.kernel.org/stable/c/053a401b592be424fea9d57c789f66cd5d8cec11patch
- https://cert-portal.siemens.com/productcert/html/ssa-784472.html
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.