High 7.8Published Feb 14, 2026

CVE-2026-23191ALSA: aloop: Fix racy access at PCM trigger

Updated under an hour ago (Oct 26, 2026, 5:40 PM ET)

Does this affect you?

It affects Linux and 1 other product. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

Do this next

Start free and add your stack

Free account, 1 product

Every CVE for Linux

Exploited in the last 30 days

In the Linux kernel, the following vulnerability has been resolved: ALSA: aloop: Fix racy access at PCM trigger The PCM trigger callback of aloop driver tries to check the PCM state and stop the stream of the tied substream in the corresponding cable. Since both check and stop operations are performed outside the cable lock, this may result in UAF when a program attempts to trigger frequently while opening/closing the tied stream, as spotted by fuzzers. For addressing the UAF, this patch changes two things: - It covers the most of code in loopback_check_format() with cable->lock spinlock, and add the proper NULL checks. This avoids already some racy accesses. - In addition, now we try to check the state of the capture PCM stream that may be stopped in this function, which was the major pain point leading to UAF.

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): CWE-362
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 19, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from b1c73fc8e697eb73e23603e465e9af2711ed4183 before f57467114f40c5aacebbea96fb4ff9e5cd2b7f18; from b1c73fc8e697eb73e23603e465e9af2711ed4183 before c99be0d5af02adebe9cb6f9869d20397fa9935a3; from b1c73fc8e697eb73e23603e465e9af2711ed4183 before f3ce8be893726899e3053cf8059ecc95d8410359; from b1c73fc8e697eb73e23603e465e9af2711ed4183 before 0e6245b2424d126ac90018142d09f0707e12998b; from b1c73fc8e697eb73e23603e465e9af2711ed4183 before bad15420050db1803767e58756114800cce91ea4; from b1c73fc8e697eb73e23603e465e9af2711ed4183 before 5727ccf9d19ca414cb76d9b647883822e2789c2e; from b1c73fc8e697eb73e23603e465e9af2711ed4183 before 826af7fa62e347464b1b4e0ba2fe19a92438084f	CNA record
linux linux_kernel linux:linux_kernel	from 2.6.37 before 6.12.70; from 6.13 before 6.18.10; 6.19; 6.19; 6.19; 6.19; 6.19; 6.19; and 2 more ranges	NVD

References

References

https://git.kernel.org/stable/c/f57467114f40c5aacebbea96fb4ff9e5cd2b7f18
https://git.kernel.org/stable/c/c99be0d5af02adebe9cb6f9869d20397fa9935a3
https://git.kernel.org/stable/c/f3ce8be893726899e3053cf8059ecc95d8410359
https://git.kernel.org/stable/c/0e6245b2424d126ac90018142d09f0707e12998b
https://git.kernel.org/stable/c/bad15420050db1803767e58756114800cce91ea4	patch
https://git.kernel.org/stable/c/5727ccf9d19ca414cb76d9b647883822e2789c2e	patch
https://git.kernel.org/stable/c/826af7fa62e347464b1b4e0ba2fe19a92438084f	patch

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.