CVE-2026-53192

Description

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 breakdown

Affected products

• Linux / Linux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – 92ad2d7f80cad43b046f093e808e11fe919d304a
• Linux / Linux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – 117743d62e1225e208568a3ffc2c07214f1347cb
• Linux / Linux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – b2214914e461d0466548a52dfe4f4ee8ce362276
• Linux / Linux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – e2331730175f74169046d2af8db1b47243df7c7a
• Linux / Linux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – 38034d04d4a75bbca01df2b313ced0bcd0fa3242
• Linux / Linux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – 3d39da65b5c422c5e5afb7d5651b0698d060a827
• Linux / Linux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – 306427adf9b97e29e5958cb9cf3096c6151fc9ff
• Linux / Linux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – 053a401b592be424fea9d57c789f66cd5d8cec11
• Linux / Linux0 – 5.10.259
• Linux / Linux0 – 5.15.210
• Linux / Linux0 – 6.1.176
• Linux / Linux0 – 6.6.143
• Linux / Linux0 – 6.12.94
• Linux / Linux0 – 6.18.36
• Linux / Linux0 – 7.0.13
• Linux / Linux5.10.259 – 5.10.*
• Linux / Linux5.15.210 – 5.15.*
• Linux / Linux6.1.176 – 6.1.*
• Linux / Linux6.6.143 – 6.6.*
• Linux / Linux6.12.94 – 6.12.*
• Linux / Linux6.18.36 – 6.18.*
• Linux / Linux7.0.13 – 7.0.*
• Linux / Linux7.1 – *

References

• MISChttps://git.kernel.org/stable/c/92ad2d7f80cad43b046f093e808e11fe919d304a
• MISChttps://git.kernel.org/stable/c/117743d62e1225e208568a3ffc2c07214f1347cb
• MISChttps://git.kernel.org/stable/c/b2214914e461d0466548a52dfe4f4ee8ce362276
• MISChttps://git.kernel.org/stable/c/e2331730175f74169046d2af8db1b47243df7c7a
• MISChttps://git.kernel.org/stable/c/38034d04d4a75bbca01df2b313ced0bcd0fa3242
• MISChttps://git.kernel.org/stable/c/3d39da65b5c422c5e5afb7d5651b0698d060a827
• MISChttps://git.kernel.org/stable/c/306427adf9b97e29e5958cb9cf3096c6151fc9ff
• MISChttps://git.kernel.org/stable/c/053a401b592be424fea9d57c789f66cd5d8cec11