fat: release buffer head after rebuilding parent
Key facts
- Attack vector
- —
- Privileges required
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- User interaction
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- Attack complexity
- —
- Impact type
- —
- Confidentiality · integrity · availability
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- Fix status
- Partial Red Hat: 6 without a fix
No CVSS vector from any source. Fix status from CNA and Red Hat.
Summary
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.
Why it matters now
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
Remediation
- Fix · CNA Linux (Linux) Fixed in 5.10.270, 5.15.221, 6.1.188, 6.6.157, 6.12.110, 6.18.52, 7.2.6, 7.3
Vendor assessments
Red Hat
Red Hat rating: Moderate. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 10 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 7 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 8 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 9 | Affected | No fix yet: Fix deferred |
| Red Hat OpenShift Container Platform 4 | Affected | No fix yet: Fix deferred |
| Red Hat OpenShift Container Platform 5 | Affected | No fix yet: Fix deferred |
Not affected: 1 product
- Red Hat Enterprise Linux 6
Timeline
- 2026-10-02 Threatist record created from CVE-2026-90318
- 2026-10-03 Alias added: GHSA-qqhm-c5f5-75r9
- 2026-10-06 Affected versions changed · Red Hat
- 2026-10-06 CVSS score added · Red Hat
- 2026-10-19 Fix available: Linux/[email protected] · CNA
- 2026-11-06 Affected versions changed · Red Hat
References
Other 8
- https://git.kernel.org/stable/c/5e44b6944e11fd6647f028219ad0be4e85e9acee
- https://git.kernel.org/stable/c/d2a86329152c69a6200c15b2bf618755f8563826
- https://git.kernel.org/stable/c/0f18d712ba9c980e05b7e33a27cde4fe3ed2d393
- https://git.kernel.org/stable/c/e38587d98d1ceac608420052c0cdd901d25878f3
- https://git.kernel.org/stable/c/c6a67aa438179cad40f8ae45469e304338d65c0a
- https://git.kernel.org/stable/c/571ea4263d69df1b48578e4314a828ecd0604755
- https://git.kernel.org/stable/c/7565e44507634514e3e1899d3acad3de43f7a2c1
- https://git.kernel.org/stable/c/83e98dbf19ab64e8528e101e20f8d50e1aaa68a8
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Sources
- CVE-2026-90318 · CVE Program
- CVE-2026-90318 · NVD
- FIRST EPSS
- GHSA-qqhm-c5f5-75r9 · GitHub Advisory Database · CC BY 4.0
- CVE-2026-90318 · Red Hat security data · CC BY 4.0
This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences