CVE-2025-38708 Affecting kernel6.12-libbpf-devel package, versions <1:6.12.46-66.121.amzn2023
Threat Intelligence
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Test your applications- Snyk IDSNYK-AMZN2023-KERNEL612LIBBPFDEVEL-13169044
- published1 Oct 2025
- disclosed4 Sept 2025
Introduced: 4 Sep 2025
CVE-2025-38708 (opens in a new tab)How to fix?
Upgrade Amazon-Linux:2023 kernel6.12-libbpf-devel to version 1:6.12.46-66.121.amzn2023 or higher.
This issue was patched in ALAS2023-2025-1208.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel6.12-libbpf-devel package and not the kernel6.12-libbpf-devel package as distributed by Amazon-Linux.
See How to fix? for Amazon-Linux:2023 relevant fixed versions and status.
In the Linux kernel, the following vulnerability has been resolved:
drbd: add missing kref_get in handle_write_conflicts
With two-primaries enabled, DRBD tries to detect "concurrent" writes
and handle write conflicts, so that even if you write to the same sector
simultaneously on both nodes, they end up with the identical data once
the writes are completed.
In handling "superseeded" writes, we forgot a kref_get, resulting in a premature drbd_destroy_device and use after free, and further to kernel crashes with symptoms.
Relevance: No one should use DRBD as a random data generator, and apparently all users of "two-primaries" handle concurrent writes correctly on layer up. That is cluster file systems use some distributed lock manager, and live migration in virtualization environments stops writes on one node before starting writes on the other node.
Which means that other than for "test cases", this code path is never taken in real life.
FYI, in DRBD 9, things are handled differently nowadays. We still detect "write conflicts", but no longer try to be smart about them. We decided to disconnect hard instead: upper layers must not submit concurrent writes. If they do, that's their fault.
References
- http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2025-38708
- https://git.kernel.org/stable/c/00c9c9628b49e368d140cfa61d7df9b8922ec2a8
- https://git.kernel.org/stable/c/0336bfe9c237476bd7c45605a36ca79c2bca62e5
- https://git.kernel.org/stable/c/3a896498f6f577e57bf26aaa93b48c22b6d20c20
- https://git.kernel.org/stable/c/46e3763dcae0ffcf8fcfaff4fc10a90a92ffdd89
- https://git.kernel.org/stable/c/57418de35420cedab035aa1da8a26c0499b7f575
- https://git.kernel.org/stable/c/7d483ad300fc0a06f69b019dda8f74970714baf8
- https://git.kernel.org/stable/c/810cd546a29bfac90ed1328ea01d693d4bd11cb1
- https://git.kernel.org/stable/c/84ef8dd3238330d1795745ece83b19f0295751bf
- https://git.kernel.org/stable/c/9f53b2433ad248cd3342cc345f56f5c7904bd8c4