CVE-2025-39800

low-risk
Published 2025-09-15

In the Linux kernel, the following vulnerability has been resolved: btrfs: abort transaction on unexpected eb generation at btrfs_copy_root() If we find an unexpected generation for the extent buffer we are cloning at btrfs_copy_root(), we just WARN_ON() and don't error out and abort the transaction, meaning we allow to persist metadata with an unexpected generation. Instead of warning only, abort the transaction and return -EUCLEAN.

Do I need to act?

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0.02% chance of exploitation
EPSS score — low exploit probability
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Not on CISA KEV list
No confirmed active exploitation reported to CISA
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Patch status unknown
Check vendor advisories for fix availability and mitigation guidance
5
CVSS 5.5/10 Medium
LOCAL / LOW complexity

Affected Products (2)

Affected Vendors

Debian Linux

References (6)

Patch https://git.kernel.org/stable/c/33e8f24b52d2796b8cfb28c19a1a7dd6476323a8
Patch https://git.kernel.org/stable/c/4290e34fb87ae556b12c216efd0ae91583446b7a
Patch https://git.kernel.org/stable/c/4734255ef39b416864139dcda96a387fe5f33a6a
Patch https://git.kernel.org/stable/c/da2124719f386b6e5d4d4b1a2e67c440e4d5892f
Patch https://git.kernel.org/stable/c/f4f5bd9251a4cbe55aaa05725c6c3c32ad1f74b3
Third Party Advisory https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html
25
/ 100
low-risk
Severity 18/34 · Moderate
Exploitability 0/34 · Minimal
Exposure 7/34 · Low