CVE-2024-40909: bpf: Fix a potential use-after-free in bpf_link_free()
First published: Fri Jul 12 2024(Updated: )
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.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Linux kernel | >=6.6.26<6.6.35 | |
| Linux Linux kernel | >=6.9<6.9.6 | |
| Linux Linux kernel | =6.10-rc1 | |
| Linux Linux kernel | =6.10-rc2 | |
| debian/linux | 5.10.223-1 5.10.226-1 6.1.115-1 6.1.119-1 6.11.10-1 6.12.5-1 |
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Reference Links
- https://git.kernel.org/stable/c/2884dc7d08d98a89d8d65121524bb7533183a63a
- https://git.kernel.org/stable/c/91cff53136daeff50816b0baeafd38a6976f6209
- https://git.kernel.org/stable/c/fa97b8fed9896f1e89cb657513e483a152d4c382
- https://git.kernel.org/linus/2884dc7d08d98a89d8d65121524bb7533183a63a
- https://security-tracker.debian.org/tracker/CVE-2024-40909
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-40909
- https://nvd.nist.gov/vuln/detail/CVE-2024-40909
- https://launchpad.net/bugs/cve/CVE-2024-40909
- https://ubuntu.com/security/CVE-2024-40909
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