Medium 5.5Published May 8, 2026

CVE-2026-43393btrfs: fix chunk map leak in btrfs_map_block() after btrfs_chunk_map_num_copies()

Updated under an hour ago (Oct 27, 2026, 6:00 AM ET)

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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: fix chunk map leak in btrfs_map_block() after btrfs_chunk_map_num_copies() Fix a chunk map leak in btrfs_map_block(): if we return early with -EINVAL, we're not freeing the chunk map that we've just looked up.

CVSS: 5.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/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: Analyzed
Record last updated: May 11, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 0ae653fbec2b9fbc72c65a0c99528990bfb2136d before 0e4aaf5a3212b6a469c2489637c29a8e2a5062a5; from 0ae653fbec2b9fbc72c65a0c99528990bfb2136d before 7bdf00ed75c477252578068dba19934cd825f20a; from 0ae653fbec2b9fbc72c65a0c99528990bfb2136d before 4f90c5c2698383984102401b1724b0b67da832ab; from 0ae653fbec2b9fbc72c65a0c99528990bfb2136d before f15fb3d41543244d1179f423da4a4832a55bc050	CNA record
linux linux_kernel linux:linux_kernel	from 6.12 before 6.12.78; from 6.13 before 6.18.19; from 6.19 before 6.19.9; 7.0; 7.0	NVD

References

References

https://git.kernel.org/stable/c/0e4aaf5a3212b6a469c2489637c29a8e2a5062a5	patch
https://git.kernel.org/stable/c/7bdf00ed75c477252578068dba19934cd825f20a	patch
https://git.kernel.org/stable/c/4f90c5c2698383984102401b1724b0b67da832ab	patch
https://git.kernel.org/stable/c/f15fb3d41543244d1179f423da4a4832a55bc050	patch

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.