What’s Vulnerable › Vulnerabilities

CVE-2026-90318: fat: release buffer head after rebuilding parent

• Severity: unknown
• 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: 2026-09-17 · updated 2026-10-19

Description

In the Linux kernel, the following vulnerability has been resolved: fat: release buffer head after rebuilding parent fat_scan_logstart() leaves the matching directory entry's buffer head in sinfo.bh for the caller to release, just like fat_scan(). fat_rebuild_parent() uses the directory entry to rebuild the parent inode for the nostale_ro NFS export path, but does not release sinfo.bh after a successful scan. Release it once fat_build_inode() has consumed the directory entry data.

Affected products

• Linux kernel: 3.10 — fixed in 7.3

How to fix

Upgrade to a fixed version: Linux kernel 7.3. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/0f18d712ba9c980e05b7e33a27cde4fe3ed2d393
• https://git.kernel.org/stable/c/571ea4263d69df1b48578e4314a828ecd0604755
• https://git.kernel.org/stable/c/5e44b6944e11fd6647f028219ad0be4e85e9acee
• https://git.kernel.org/stable/c/7565e44507634514e3e1899d3acad3de43f7a2c1
• https://git.kernel.org/stable/c/83e98dbf19ab64e8528e101e20f8d50e1aaa68a8
• https://git.kernel.org/stable/c/c6a67aa438179cad40f8ae45469e304338d65c0a
• https://git.kernel.org/stable/c/d2a86329152c69a6200c15b2bf618755f8563826
• https://git.kernel.org/stable/c/e38587d98d1ceac608420052c0cdd901d25878f3

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