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CVE-2026-90318· NVD / CVE Program· CNA Linux

fat: release buffer head after rebuilding parent

Noroxi assessment

Priority: Monitor (action score 0/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.21% (FIRST EPSS).
  • Fixed version: Linux Linux 0f18d712ba9c980e05b7e33a27cde4fe3ed2d393, 571ea4263d69df1b48578e4314a828ecd0604755, 5e44b6944e11fd6647f028219ad0be4e85e9acee; azl3 kernel 6.6.152.1-1 on Azure Linux 3.0 6.6.157.1-1.

Low priority for now. Upgrade to Linux Linux 0f18d712ba9c980e05b7e33a27cde4fe3ed2d393, 571ea4263d69df1b48578e4314a828ecd0604755, 5e44b6944e11fd6647f028219ad0be4e85e9acee; azl3 kernel 6.6.152.1-1 on Azure Linux 3.0 6.6.157.1-1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

—No exploit Fix available
Published
Sep 17, 2026
Updated
Sep 17, 2026
EPSS
0.2% · 10th percentile
CWE
—

Report tools

JSON

Action score

0

Monitor

Low priority for now.

CVSS
0 / 40 · —
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

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When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 3.10affected
    • f1e6fb0ab451dae8523fbb8c119a653b2730e938 and later · before 5e44b6944e11fd6647f028219ad0be4e85e9aceeaffected · git
    • f1e6fb0ab451dae8523fbb8c119a653b2730e938 and later · before d2a86329152c69a6200c15b2bf618755f8563826affected · git
    • f1e6fb0ab451dae8523fbb8c119a653b2730e938 and later · before 0f18d712ba9c980e05b7e33a27cde4fe3ed2d393affected · git
    • f1e6fb0ab451dae8523fbb8c119a653b2730e938 and later · before e38587d98d1ceac608420052c0cdd901d25878f3affected · git
    • f1e6fb0ab451dae8523fbb8c119a653b2730e938 and later · before c6a67aa438179cad40f8ae45469e304338d65c0aaffected · git
    • f1e6fb0ab451dae8523fbb8c119a653b2730e938 and later · before 571ea4263d69df1b48578e4314a828ecd0604755affected · git
    • f1e6fb0ab451dae8523fbb8c119a653b2730e938 and later · before 7565e44507634514e3e1899d3acad3de43f7a2c1affected · git
    • f1e6fb0ab451dae8523fbb8c119a653b2730e938 and later · before 83e98dbf19ab64e8528e101e20f8d50e1aaa68a8affected · git
    • before 3.10not affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.190-16.1.190-1
Debian:12linux-6.12before 6.12.111-1~deb12u16.12.111-1~deb12u1
Debian:13linuxbefore 6.12.111-16.12.111-1
Debian:14linuxbefore 7.2.6-17.2.6-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan
  • CVE-2026-74279crypto: cavium/cpt - fix DMA cleanup using wrong loop index
    40Plan
  • CVE-2026-72421ipv4: fib: Don't ignore error route in local/main tables.
    40Plan
  • CVE-2026-74309vdpa/octeon_ep: fix IRQ-to-ring mapping in interrupt handler
    40Plan

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux0f18d712ba9c980e05b7e33a27cde4fe3ed2d393Vendor (CNA)
Linux Linux571ea4263d69df1b48578e4314a828ecd0604755Vendor (CNA)
Linux Linux5e44b6944e11fd6647f028219ad0be4e85e9aceeVendor (CNA)
Linux Linux7565e44507634514e3e1899d3acad3de43f7a2c1Vendor (CNA)
Linux Linux83e98dbf19ab64e8528e101e20f8d50e1aaa68a8Vendor (CNA)
Linux Linuxc6a67aa438179cad40f8ae45469e304338d65c0aVendor (CNA)
Linux Linuxd2a86329152c69a6200c15b2bf618755f8563826Vendor (CNA)
Linux Linuxe38587d98d1ceac608420052c0cdd901d25878f3Vendor (CNA)
azl3 kernel 6.6.150.1-1 on Azure Linux 3.0—Microsoft (MSRC)
azl3 kernel 6.6.152.1-1 on Azure Linux 3.06.6.157.1-1 · Release NotesMicrosoft (MSRC)
debian:linux6.1.190-1 · Debian:12Package registry (OSV)
debian:linux6.12.111-1 · Debian:13Package registry (OSV)
debian:linux-6.126.12.111-1~deb12u1 · Debian:12Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

No CVSS vector for this record, so attack conditions can't be derived.

Weakness class (CWE)

—

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (7 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records