CVE-2026-98196

Description

In the Linux kernel, the following vulnerability has been resolved: wifi: brcmsmac: fix UAF in brcms_free_timer() brcms_free_timer() calls brcms_del_timer() which uses the non-synchronous cancel_delayed_work() to cancel the timer's underlying delayed work. If the work callback (_brcms_timer) is already running, cancel_delayed_work() returns false without waiting, and brcms_free_timer() proceeds to kfree(t) while the callback still accesses t through container_of(). Add an explicit cancel_delayed_work_sync() after brcms_del_timer() to guarantee that any in-flight callback has completed before the timer structure is freed.

References

• https://git.kernel.org/stable/c/050d2486e8ed2c0a23b87249ccd23e8072721391
• https://git.kernel.org/stable/c/10eeb0b29fd7f52487c9ae573e8d79c210a0095d
• https://git.kernel.org/stable/c/1edb3ddd261e973a4d577c0547e63bfa25a8170d
• https://git.kernel.org/stable/c/1eeca1d5e0920fbdad6449768fd2d4364e714180
• https://git.kernel.org/stable/c/2a4841ff0b74b495cddd31ae324e922217fc2f13