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Vulnerability record · CVE-2026-23191 · published 14 February 2026

CVE-2026-23191: Linux kernel use after free vulnerability

Linux · Linux Kernel

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.

7.0 CVSS 3.1 High EPSS 0.12% · top 98.4% CWE-416 · Use after free
7.0CVSS 3.1 base score
0.12%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
7References
14 Sep 2026Last modified by NVD

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:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

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

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Source: NIST National Vulnerability Database (record CVE-2026-23191), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.