CVE-2026-89874

Summary

In the Linux kernel, the following vulnerability has been resolved:

media: v4l2-async: avoid deleting unlinked ASC entry on link error

v4l2_async_match_notify() creates ancillary media links before adding asc->asc_subdev_entry to sd->asc_list.

If ancillary link creation fails, the function jumps to err_call_unbind while asc_subdev_entry has not been linked yet. Async connections are zero-allocated, so the list entry still has NULL next and prev pointers on this path. Calling list_del() on it can therefore dereference NULL instead of returning the original link creation error.

Do not delete asc_subdev_entry from err_call_unbind. There is no list insertion to undo on this path; the bound callback and sub-device registration are the operations that need to be rolled back.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux28a1295795d85a25f2e7dd391c43969e95fcb341 < d273571e531405426983c6a45ec635c7d0415eedaffected
LinuxLinux28a1295795d85a25f2e7dd391c43969e95fcb341 < caac13f518d83974e9884d1eeda3d4cc3bb92978affected
LinuxLinux28a1295795d85a25f2e7dd391c43969e95fcb341 < 3345746e0957bce6c53644838e4955710a82a962affected
LinuxLinux28a1295795d85a25f2e7dd391c43969e95fcb341 < a57d94026cb4fd7b3d258f0db2ad391cbccfaba5affected
LinuxLinux28a1295795d85a25f2e7dd391c43969e95fcb341 < 47d82b605351c0e04f6365e42c8ffe2fcfdba615affected
LinuxLinux6.6affected
LinuxLinux0 < 6.6unaffected
LinuxLinux6.6.157 <= 6.6.*unaffected
LinuxLinux6.12.110 <= 6.12.*unaffected
LinuxLinux6.18.51 <= 6.18.*unaffected
LinuxLinux7.2.5 <= 7.2.*unaffected
LinuxLinux7.3-rc1 <= *unaffected

Weaknesses

References