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A high-severity vulnerability (CVE-2026-63954) in the Linux kernel's HPFS file system driver could cause a system crash when the function hpfs_map_dnode_bitmap fails, due to calling hpfs_brelse4 on an uninitialized buffer. This flaw has been fixed in updated Linux kernel versions. The vulnerability has a CVSS score of 7.8 and impacts confidentiality, integrity, and availability. Multiple Linux kernel versions prior to 7.0.0-28.28 and related builds are affected. Official patches are available from Ubuntu and other Linux distributors, and users should update and reboot to apply the fixes.

The Linux kernel contained a vulnerability in the HPFS file system driver where failure of the hpfs_map_dnode_bitmap function led to a call to hpfs_brelse4 on an uninitialized quad buffer head, causing a kernel crash. This could result in denial of service and potentially other impacts as indicated by the CVSS vector (local attack with low complexity and privileges required, no user interaction, affecting confidentiality, integrity, and availability). The issue has been resolved in Linux kernel updates released by Ubuntu and others. Multiple affected kernel versions prior to 7.0.0-28.28 and related package versions are identified. The vendor advisory confirms patch availability and recommends updating and rebooting systems.

Detailed information about In the Linux kernel, the following vulnerability has been resolved: hpfs: fix a crash if hpfs_map_dnode_bitmap fails If hpfs_map_dnod

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,… (CVE-2026-63954) - Live Threat Intelligence - Threat Radar | OffSeq.com

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,… (CVE-2026-63954)

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