Vulnerability Description
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 Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 2.6.37, < 6.12.70 |
Related Weaknesses (CWE)
References
- https://git.kernel.org/stable/c/5727ccf9d19ca414cb76d9b647883822e2789c2ePatch
- https://git.kernel.org/stable/c/826af7fa62e347464b1b4e0ba2fe19a92438084fPatch
- https://git.kernel.org/stable/c/bad15420050db1803767e58756114800cce91ea4Patch
FAQ
What is CVE-2026-23191?
CVE-2026-23191 is a vulnerability with a CVSS score of 7.8 (HIGH). 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 str...
How severe is CVE-2026-23191?
CVE-2026-23191 has been rated HIGH with a CVSS base score of 7.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-23191?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel.