high7.8
CVE-2024-40909
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 …
Impact
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.
Affected products
| Vendor | Product | Affected versions |
|---|---|---|
| Linux | Linux Kernel | from 6.6.26 before 6.6.35 from 6.9 before 6.9.6 Version 6.10 |
Weakness classification
References
- NVD record
- CVE.org record
- https://git.kernel.org/stable/c/2884dc7d08d98a89d8d65121524bb7533183a63a
- https://git.kernel.org/stable/c/91cff53136daeff50816b0baeafd38a6976f6209
- https://git.kernel.org/stable/c/e8ccda39b395169622855607085cdeef4d376e0f
- https://git.kernel.org/stable/c/fa97b8fed9896f1e89cb657513e483a152d4c382