CVE-2026-89874

Description

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.

References

• https://git.kernel.org/stable/c/3345746e0957bce6c53644838e4955710a82a962
• https://git.kernel.org/stable/c/47d82b605351c0e04f6365e42c8ffe2fcfdba615
• https://git.kernel.org/stable/c/a57d94026cb4fd7b3d258f0db2ad391cbccfaba5
• https://git.kernel.org/stable/c/caac13f518d83974e9884d1eeda3d4cc3bb92978
• https://git.kernel.org/stable/c/d273571e531405426983c6a45ec635c7d0415eed