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Unrated severityNVD Advisory· Published Jul 12, 2024· Updated May 4, 2025

bpf: Fix a potential use-after-free in bpf_link_free()

CVE-2024-40909

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.

Affected products

106

Patches

3
2884dc7d08d9
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.gitvia osv
commit
fa97b8fed989
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.gitvia osv
commit
91cff53136da
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.gitvia osv
commit

Vulnerability mechanics

Generated on May 9, 2026. Inputs: CWE entries + fix-commit diffs from this CVE's patches. Citations validated against bundle.

References

3

News mentions

0

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