CVE-2024-40909 (GCVE-0-2024-40909)

Vulnerability from cvelistv5 – Published: 2024-07-12 12:20 – Updated: 2025-05-04 12:57
VLAI?
Title
bpf: Fix a potential use-after-free in bpf_link_free()
Summary
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.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 876941f533e7b47fc69977fc4551c02f2d18af97 , < 91cff53136daeff50816b0baeafd38a6976f6209 (git)
Affected: 1a80dbcb2dbaf6e4c216e62e30fa7d3daa8001ce , < fa97b8fed9896f1e89cb657513e483a152d4c382 (git)
Affected: 1a80dbcb2dbaf6e4c216e62e30fa7d3daa8001ce , < 2884dc7d08d98a89d8d65121524bb7533183a63a (git)
Affected: 5d8d447777564b35f67000e7838e7ccb64d525c8 (git)
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    Linux Linux Affected: 6.9
Unaffected: 0 , < 6.9 (semver)
Unaffected: 6.6.35 , ≤ 6.6.* (semver)
Unaffected: 6.9.6 , ≤ 6.9.* (semver)
Unaffected: 6.10 , ≤ * (original_commit_for_fix)
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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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