High 7.8Published Sep 15, 2025

CVE-2025-39800btrfs: abort transaction on unexpected eb generation at btrfs_copy_root()

Updated under an hour ago (Oct 27, 2026, 3:00 PM ET)

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It affects Linux and 3 other products. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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.

CVSS: 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Modified
Record last updated: Aug 5, 2026
First seen by InfoSec Signals: Oct 19, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from be20aa9dbadc8c06283784ee12bbc0d97dea3418 before 4290e34fb87ae556b12c216efd0ae91583446b7a; from be20aa9dbadc8c06283784ee12bbc0d97dea3418 before 4734255ef39b416864139dcda96a387fe5f33a6a; from be20aa9dbadc8c06283784ee12bbc0d97dea3418 before da2124719f386b6e5d4d4b1a2e67c440e4d5892f; from be20aa9dbadc8c06283784ee12bbc0d97dea3418 before f4f5bd9251a4cbe55aaa05725c6c3c32ad1f74b3; from be20aa9dbadc8c06283784ee12bbc0d97dea3418 before 33e8f24b52d2796b8cfb28c19a1a7dd6476323a8	CNA record
Siemens SIMATIC CN 4100 siemens:simatic_cn_4100 (from the name)	before V5.0	CISA ADP
linux linux_kernel linux:linux_kernel	from 2.6.29 before 6.1.149; from 6.2 before 6.6.103; from 6.7 before 6.12.44; from 6.13 before 6.16.4	NVD
debian debian_linux debian:debian_linux	11.0	NVD

References

References

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	patch
https://git.kernel.org/stable/c/33e8f24b52d2796b8cfb28c19a1a7dd6476323a8	patch
https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html	third-party-advisory
https://cert-portal.siemens.com/productcert/html/ssa-032379.html

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.