What’s Vulnerable › Vulnerabilities

CVE-2026-63954: hpfs: fix a crash if hpfs_map_dnode_bitmap fails

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-19 · updated 2026-10-30

Description

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.

Affected products

• Linux kernel: from 2.6.12.1 before 5.10.259; from 5.11 before 5.15.210; from 5.16 before 6.1.176; from 6.2 before 6.6.143; from 6.7 before 6.12.93; from 6.13 before 6.18.35 — fixed in 5.10.259, 5.15.210, 6.1.176, 6.6.143, 6.12.93, 6.18.35
• Linux kernel: 2.6.12 — fixed in 7.1

How to fix

Upgrade to a fixed version: Linux kernel 5.10.259, 5.15.210, 6.1.176, 6.6.143; Linux kernel 7.1. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/010b08084000ef018f1a8de5197087f3b91d8cfe
• https://git.kernel.org/stable/c/0886c6f257fe3663f80218aa1919b0f3f21bf22c
• https://git.kernel.org/stable/c/1648a3c7f4e18f46a4881920133fc4f2494185a0
• https://git.kernel.org/stable/c/1d73a533760bc5abb83b3cc759133596f7bb708f
• https://git.kernel.org/stable/c/4f37bb30b57d6d403d02673074555bd3c3602bef
• https://git.kernel.org/stable/c/7c58c55a2a16f7274772507bd1637be609351b4f
• https://git.kernel.org/stable/c/974820a59efde7c1a7e1260bcfe9bb81f833cc9f
• https://git.kernel.org/stable/c/d98d8562b3284b5a5c8eb67e71b794508e46e288

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