Detections
Analytics
CVE-2024-40909
high
Description
In the Linux kernel, the following vulnerability has been resolved: bpf: Fix a potential use-after-free in bpf_link_free() After commit 1a80dbcb2dba, bpf_link can be freed by link->ops->dealloc_deferred, but the code still tests and uses link->ops->dealloc afterward, which leads to a use-after-free as reported by syzbot. Actually, one of them should be sufficient, so just call one of them instead of both. Also add a WARN_ON() in case of any problematic implementation.
References
https://git.kernel.org/stable/c/fa97b8fed9896f1e89cb657513e483a152d4c382
https://git.kernel.org/stable/c/91cff53136daeff50816b0baeafd38a6976f6209
https://git.kernel.org/stable/c/2884dc7d08d98a89d8d65121524bb7533183a63a