Medium [CVE-2026-89772] Linux kernel Btrfs: Data corruption and loss due to missing write protection during data writeback
This medium-severity Red Hat Linux advisory covers CVE-2026-89772.
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Summary
A flaw was found in the Btrfs filesystem of the Linux kernel. This vulnerability allows a local attacker with write access to a memory-mapped file to modify data while it is being written to disk.
This can lead to data corruption, where the integrity of the stored information is compromised, or data loss, where recent changes to a file are not saved correctly even after a save operation. The issue arises from a missing write-protection mechanism during specific data writeback operations.
Red Hat severity: Moderate — CVSS 6.3 (CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:H/A:H). Weakness: CWE-413.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · medium-confidence parse· fetched 55 minutes ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · medium-confidence parse· fetched 55 minutes ago·verify at source
Mitigation
The source record does not include mitigation steps. That is not a statement that no fix exists — read the vendor advisory below for the authoritative guidance.
Official advisory · medium-confidence parse· fetched 55 minutes ago·verify at source
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