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NVD / CVE Program· CNA Linux

CVE-2026-90103: NFSv4.2: fix LAYOUTSTATS send buffer exhaustion

Noroxi assessment

Priority: Monitor (action score 30/100)

  • 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: 0.69% (FIRST EPSS); higher than 52.9% of all records.
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Linux Linux 3815b894b922e9b4f40b8b6f6d67bf80d44141c9, 397aa7000bbf6b6a0d32e66a544e978fb478c8e4, 5aca000630c0fd0da102ae1abf9245dd74f2ce36.

Low priority for now. Upgrade to Linux Linux 3815b894b922e9b4f40b8b6f6d67bf80d44141c9, 397aa7000bbf6b6a0d32e66a544e978fb478c8e4, 5aca000630c0fd0da102ae1abf9245dd74f2ce36 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: NFSv4.2: fix LAYOUTSTATS send buffer exhaustion encode_layoutstats_maxsz budgets XDR_QUADLEN(PNFS_LAYOUTSTATS_MAXSIZE), i.e. 256 bytes, for the layoutupdate4 body written by the layout driver. The flexfiles record can exceed that. ff_layout_encode_ff_layoutupdate() emits, per data server, a netaddr4, an nfs_fh4, two ff_io_latency4, an nfstime4 and a bool. A data server whose filehandle is NFS_MAXFHSIZE bytes long already accounts for 132 of those bytes, and the two ff_io_latency4 at 64 bytes each, the nfstime4 and the bool add a further 144, so the body passes 256 bytes before the netaddr4 is encoded at all. encode_layoutstats() additionally writes the deviceid4 and the layoutupdate4 lou_type word, neither of which the macro accounts for. The filehandle and the address are both chosen by the server, through LAYOUTGET and GETDEVICEINFO, so it can drive the encoder past the end of the send buffer. xdr_reserve_space() returns NULL once that happens, and the two ff_layout_encode_io_latency() calls run with dss_info->mirror->lock held, so a NULL return there leaves the lock permanently held. Raise PNFS_LAYOUTSTATS_MAXSIZE to 384 so that the record fits inside the reservation.

HighCVSS 7.5 · v3.1—No exploit Fix available
Published
Sep 17, 2026
Updated
Oct 19, 2026
EPSS
0.6% · 52th percentile
CWE
—

Report tools

JSON

Action score

30

Monitor

Low priority for now.

CVSS
30 / 40 · 7.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.6%

CNA vs NVD score

NVD
—
CNA · Linux
7.5
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

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  • 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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Follow CVE-2026-90103

When you'll hear from us

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  • 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

    • 4.2affected
    • 27c430644369ccd9a2272492ba6d0e85e2e4800b and later · before 842ac26615424577f24f0486b9d3bf97f28fad9caffected · git
    • 27c430644369ccd9a2272492ba6d0e85e2e4800b and later · before 397aa7000bbf6b6a0d32e66a544e978fb478c8e4affected · git
    • 27c430644369ccd9a2272492ba6d0e85e2e4800b and later · before e82d7d999fe9f893f84bf332fd39cb5d9de7128faffected · git
    • 27c430644369ccd9a2272492ba6d0e85e2e4800b and later · before 5aca000630c0fd0da102ae1abf9245dd74f2ce36affected · git
    • 27c430644369ccd9a2272492ba6d0e85e2e4800b and later · before cb11590c7ddc6883a1b1d70b1f98b2779fe626f2affected · git
    • 27c430644369ccd9a2272492ba6d0e85e2e4800b and later · before 3815b894b922e9b4f40b8b6f6d67bf80d44141c9affected · git
    • 27c430644369ccd9a2272492ba6d0e85e2e4800b and later · before a973622da0c62c34043ddbbf382cd761b03e5136affected · git
    • 27c430644369ccd9a2272492ba6d0e85e2e4800b and later · before c75ef2137e749f2673f0617cfdaae53b2bb7195aaffected · git
    • before 4.2not 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

Published before and after this one in the same product

  • ← EarlierCVE-2026-90101Sep 17, 2026 · bnxt_en: Fix call to hardware monitoring event handler
    0Monitor
  • ← EarlierCVE-2026-90102Sep 17, 2026 · NFSv4/pnfs: key the data server cache on the NFS version
    30Monitor
  • Later →CVE-2026-90104Sep 17, 2026 · NFSv4.1: zero referring call lists before decoding
    39Monitor

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 Linux3815b894b922e9b4f40b8b6f6d67bf80d44141c9Vendor (CNA)
Linux Linux397aa7000bbf6b6a0d32e66a544e978fb478c8e4Vendor (CNA)
Linux Linux5aca000630c0fd0da102ae1abf9245dd74f2ce36Vendor (CNA)
Linux Linux842ac26615424577f24f0486b9d3bf97f28fad9cVendor (CNA)
Linux Linuxa973622da0c62c34043ddbbf382cd761b03e5136Vendor (CNA)
Linux Linuxc75ef2137e749f2673f0617cfdaae53b2bb7195aVendor (CNA)
Linux Linuxcb11590c7ddc6883a1b1d70b1f98b2779fe626f2Vendor (CNA)
Linux Linuxe82d7d999fe9f893f84bf332fd39cb5d9de7128fVendor (CNA)
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

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

—

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

nvd-secondary

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