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CVE-2026-43168: ocfs2: fix reflink preserve cleanup issue

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-05-06 · updated 2026-06-17

Description

In the Linux kernel, the following vulnerability has been resolved: ocfs2: fix reflink preserve cleanup issue commit c06c303832ec ("ocfs2: fix xattr array entry __counted_by error") doesn't handle all cases and the cleanup job for preserved xattr entries still has bug: - the 'last' pointer should be shifted by one unit after cleanup an array entry. - current code logic doesn't cleanup the first entry when xh_count is 1. Note, commit c06c303832ec is also a bug fix for 0fe9b66c65f3.

Affected products

• Linux kernel: from 2.6.32 before 5.10.252; from 5.11 before 5.15.202; from 5.16 before 6.1.165; from 6.2 before 6.6.128; from 6.7 before 6.12.75; from 6.13 before 6.18.16 — fixed in 5.10.252, 5.15.202, 6.1.165, 6.12.75, 6.18.16, 6.19.6

How to fix

Upgrade to a fixed version: Linux kernel 5.10.252, 5.15.202, 6.1.165, 6.12.75. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/02acc9f72365e50eb45a56b7dacb9114ca3b503c
• https://git.kernel.org/stable/c/2f4daccd9d9b8b2952df7878df8c2e8ba6439398
• https://git.kernel.org/stable/c/3bdc3766aafb052aef4baadef455a84c1c0a059d
• https://git.kernel.org/stable/c/5138c936c2c82c9be8883921854bc6f7e1177d8c
• https://git.kernel.org/stable/c/8ff329353134280b203cb2bce95311cb8f7cbd8a
• https://git.kernel.org/stable/c/b2952dbeac2c3c527cb0519d5ffaeb95b062466a
• https://git.kernel.org/stable/c/bb273b68c1719c2925e05557f7e7099edb066680
• https://git.kernel.org/stable/c/c44d86ca949cb1e5566ad14510cc26fa1a17e2d8

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