Advisory [CVE-2026-63954] fix a crash if hpfs_map_dnode_bitmap fails
This security Red Hat Linux advisory covers CVE-2026-63954.
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Summary
In the Linux kernel, the following vulnerability has been resolved: hpfs: fix a crash if hpfs_map_dnode_bitmap fails If hpfs_map_dnode_bitmap fails, the code would call hpfs_brelse4 on uninitialized quad buffer head, causing a crash. A flaw was found in the Linux kernel's High Performance File System (HPFS) component.
This vulnerability occurs when the hpfs_map_dnode_bitmap function fails, leading to the system attempting to release an uninitialized buffer. An attacker could potentially trigger this condition, resulting in a system crash and causing a Denial of Service (DoS).
Red Hat severity: not rated. Weakness: CWE-824.
Red Hat lists Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9 as not affected.
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 7 days 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 7 days 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 7 days ago·verify at source
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