Vulnerability Details 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 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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.0
EPSS Ranking 2.0%
CVSS Severity
CVSS v3 Score 7.8
References
- 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/stable/c/2884dc7d08d98a89d8d65121524bb7533183a63a
- https://git.kernel.org/stable/c/91cff53136daeff50816b0baeafd38a6976f6209
- https://git.kernel.org/stable/c/fa97b8fed9896f1e89cb657513e483a152d4c382
Products affected by CVE-2024-40909
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cpe:2.3:o:linux:linux_kernel:6.10
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cpe:2.3:o:linux:linux_kernel:6.6.26
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cpe:2.3:o:linux:linux_kernel:6.6.27
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cpe:2.3:o:linux:linux_kernel:6.6.28
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cpe:2.3:o:linux:linux_kernel:6.6.29
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cpe:2.3:o:linux:linux_kernel:6.6.30
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cpe:2.3:o:linux:linux_kernel:6.6.31
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cpe:2.3:o:linux:linux_kernel:6.6.32
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cpe:2.3:o:linux:linux_kernel:6.6.33
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cpe:2.3:o:linux:linux_kernel:6.6.34
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cpe:2.3:o:linux:linux_kernel:6.9
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cpe:2.3:o:linux:linux_kernel:6.9.1
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cpe:2.3:o:linux:linux_kernel:6.9.2
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cpe:2.3:o:linux:linux_kernel:6.9.3
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cpe:2.3:o:linux:linux_kernel:6.9.4
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cpe:2.3:o:linux:linux_kernel:6.9.5