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.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
b1c73fc8e697eb73e23603e465e9af2711ed4183 to < f57467114f40c5aacebbea96fb4ff9e5cd2b7f18affectedb1c73fc8e697eb73e23603e465e9af2711ed4183 to < c99be0d5af02adebe9cb6f9869d20397fa9935a3affectedb1c73fc8e697eb73e23603e465e9af2711ed4183 to < f3ce8be893726899e3053cf8059ecc95d8410359affectedb1c73fc8e697eb73e23603e465e9af2711ed4183 to < 0e6245b2424d126ac90018142d09f0707e12998baffectedb1c73fc8e697eb73e23603e465e9af2711ed4183 to < bad15420050db1803767e58756114800cce91ea4affectedb1c73fc8e697eb73e23603e465e9af2711ed4183 to < 5727ccf9d19ca414cb76d9b647883822e2789c2eaffectedb1c73fc8e697eb73e23603e465e9af2711ed4183 to < 826af7fa62e347464b1b4e0ba2fe19a92438084faffected
Linux Linux
Default version status: affected
2.6.37affected0 to < 2.6.37unaffected5.10.270 to ≤ 5.10.*unaffected5.15.221 to ≤ 5.15.*unaffected6.1.188 to ≤ 6.1.*unaffected6.6.157 to ≤ 6.6.*unaffected6.12.70 to ≤ 6.12.*unaffected6.18.10 to ≤ 6.18.*unaffected6.19 to ≤ *unaffected
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 ↗
- https://git.kernel.org/stable/c/5727ccf9d19ca414cb76d9b647883822e2789c2e ↗
- https://git.kernel.org/stable/c/826af7fa62e347464b1b4e0ba2fe19a92438084f ↗