ALSA: pcm: oss: Fix setup list UAF on proc write error

Summary

In the Linux kernel, the following vulnerability has been resolved: ALSA: pcm: oss: Fix setup list UAF on proc write error snd_pcm_oss_proc_write() links a newly allocated setup entry into the OSS setup list before duplicating the task name. If the task-name allocation fails, the error path frees the already linked entry and leaves setup_list pointing at freed memory. A later OSS device open can then walk the stale list entry in snd_pcm_oss_look_for_setup() and dereference freed memory. Allocate the task name and initialize the setup entry before publishing the entry on setup_list. Also fetch the initial proc read iterator only after taking setup_mutex, so all setup_list traversal follows the same list lifetime rules.

Timeline

1. Jul 19, 2026, 2:56 PM UTCCVE published
2. Oct 21, 2026, 12:42 PM UTCRecord last updated

Affected versions

• Linux Linux

  From 060d77b9c04acd7aef60790398a53f731db8c8fe · fixed in d9df965284abde27ba6bfbdfc8407697cf6802f1; From 060d77b9c04acd7aef60790398a53f731db8c8fe · fixed in 8be4efd0dc0093eb7a02ad1aac936bca2a1f04ce; From 060d77b9c04acd7aef60790398a53f731db8c8fe · fixed in e13922bb97b4e6f94f8ac02d034f2d4bd65eeb3c; From 060d77b9c04acd7aef60790398a53f731db8c8fe · fixed in be387230dc22d870afd0e5d35912b07c2bc323bd; From 060d77b9c04acd7aef60790398a53f731db8c8fe · fixed in 4cc54bdd54b337e77115be5b55577d1c58608eae

• Linux Linux

  2.6.17

• KernelLinux

  From 2.6.17 · fixed in 6.6.160; From 6.7.0 · fixed in 6.12.93; From 6.13.0 · fixed in 6.18.35; From 6.19.0 · fixed in 7.0.12

References 5