UBUNTU-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.
02 / AFFECTED SOFTWARE
Affected packages
50 explicit affected versions
6 explicit affected versions
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23 explicit affected versions
10 explicit affected versions
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10 explicit affected versions
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26 explicit affected versions
11 explicit affected versions
3 explicit affected versions
12 explicit affected versions
13 explicit affected versions
11 explicit affected versions
16 explicit affected versions
12 explicit affected versions
3 explicit affected versions
51 explicit affected versions
26 explicit affected versions
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27 explicit affected versions
5 explicit affected versions
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5 explicit affected versions
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10 explicit affected versions
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13 explicit affected versions
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35 explicit affected versions
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9 explicit affected versions
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4 explicit affected versions
23 explicit affected versions
13 explicit affected versions
21 explicit affected versions
16 explicit affected versions
10 explicit affected versions
11 explicit affected versions
7 explicit affected versions
12 explicit affected versions
12 explicit affected versions
1 explicit affected versions
7 explicit affected versions
12 explicit affected versions
12 explicit affected versions
5 explicit affected versions
37 explicit affected versions
2 explicit affected versions
10 explicit affected versions
26 explicit affected versions
13 explicit affected versions
29 explicit affected versions
44 explicit affected versions
13 explicit affected versions
3 explicit affected versions
4 explicit affected versions
33 explicit affected versions
37 explicit affected versions
12 explicit affected versions
38 explicit affected versions
9 explicit affected versions
11 explicit affected versions
4 explicit affected versions
7 explicit affected versions
4 explicit affected versions
13 explicit affected versions
43 explicit affected versions
10 explicit affected versions
8 explicit affected versions
7 explicit affected versions
14 explicit affected versions
4 explicit affected versions
1 explicit affected versions
5 explicit affected versions
03 / CONNECTIONS
Connected vulnerabilities
04 / EVIDENCE
Source records
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.
05 / REFERENCES
Further evidence
- https://git.kernel.org/linus/2884dc7d08d98a89d8d65121524bb7533183a63a
- https://git.kernel.org/stable/c/2884dc7d08d98a89d8d65121524bb7533183a63a
- https://git.kernel.org/stable/c/91cff53136daeff50816b0baeafd38a6976f6209
- https://git.kernel.org/stable/c/fa97b8fed9896f1e89cb657513e483a152d4c382
- https://ubuntu.com/security/CVE-2024-40909
- https://ubuntu.com/security/notices/USN-6999-1
- https://ubuntu.com/security/notices/USN-6999-2
- https://ubuntu.com/security/notices/USN-7004-1
- https://ubuntu.com/security/notices/USN-7005-1
- https://ubuntu.com/security/notices/USN-7005-2
- https://ubuntu.com/security/notices/USN-7008-1
- https://ubuntu.com/security/notices/USN-7029-1
- https://www.cve.org/CVERecord?id=CVE-2024-40909