Unknown

CVE-2026-89710 — NFSv4.1: fix layout segment leak on the pnfs_layout_process() forget path

In the Linux kernel, the following vulnerability has been resolved: NFSv4.1: fix layout segment leak on the pnfs_layout_process() forget path When the server returns a new layout stateid while a valid one is still held, pnfs_layout_process() calls pnfs_mark_matching_lsegs_return() on the on-stack free_me list and jumps to out_forget. Segments whose reference count drops to zero are unlinked from lo->plh_segs and moved to free_me by mark_lseg_invalid(); for an idle cached segment the layout header holds the only reference, so this happens on the first decrement. out_forget never drains free_me -- only the success path calls pnfs_free_lseg_list(). Commit 814b84971388 ("pNFS/NFSv4: Fix a layout segment leak in pnfs_layout_process()") added the drain; commit 08bd8dbe8882 ("pNFS/NFSv4: Try to return invalid layout in pnfs_layout_process()") removed it while switching the destination to lo->plh_return_segs, which is drained elsewhere. Commit fb700ef02676 ("NFSv4.1: Simplify layout return in pnfs_layout_process()") switched the destination back to free_me without restoring the drain. Restore the pnfs_free_lseg_list() call.

Published Sep 11, 2026 · Updated Oct 19, 2026 · Sources: NIST National Vulnerability Database, CVE Program (cve.org) e CISA ADP, GitHub Security Advisories · CNA: Linux

Low

Who exploits it and how urgent it is

A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.

No exploitation signal in the sources consulted so far.

How the score was calculated

EPSS 0.2% (30-day exploitation probability)+1

The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

Exploitation

Not confirmed

Not in CISA KEV — an absence of record, not proof it is unexploited.

EPSS FIRST

0.17%

ahead of 6% of scored CVEs · Oct 20, 2026

Affects

Linux

CVSS base

—

Score not published yet.

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

No fix documented by the sources we poll. That does not mean none exists: check the vendor advisory.

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

Identify exposed assets running the affected vendor/product/version combinations (Linux Linux).
No fix documented in the sources: reduce exposure and monitor the vendor advisory.
Search available logs for exploit probes, errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

Vendor	Product	Versions	Status	Source
Linux	Linux	≥ fb700ef026766c95578aafc0db1b208946e7ad4f and < f52188118d319b47d49ee91a897f6afda4879c59≥ fb700ef026766c95578aafc0db1b208946e7ad4f and < ad3e41855325e55623276660ef20fbc3b8ba087f≥ fb700ef026766c95578aafc0db1b208946e7ad4f and < a080bb69d30f11738d753a60d1eb733d627c2093≥ fb700ef026766c95578aafc0db1b208946e7ad4f and < 7c5b0e813efd9124760d5fd1bfc6b229f03fb1a2≥ fb700ef026766c95578aafc0db1b208946e7ad4f and < 36e3f13bf0728f4ce11ee8904cec82a783222f62≥ fb700ef026766c95578aafc0db1b208946e7ad4f and < 32ac1b0b7f1cfa0d1a1faf9c72f4154046101070≥ fb700ef026766c95578aafc0db1b208946e7ad4f and < ee5a386cfe60f3f8286de16a9db8e1a08f0bc124version 5.13	Vulnerable	CVE Program (cve.org) e CISA ADP

EPSS over time FIRST

Oct 15, 2026 → Oct 20, 2026 · 5 reading(s) · max 0.17%

Detection

Read off the CVSS vector and the weakness class. Starting points, not tested rules.

Not enough vector or weakness data: use the affected application’s logs as a starting point.

application logs

Timeline

What happened to this CVE, newest first.

2026
Record published
Oct 15, 2026
Affected products added · linux/linux
Oct 15, 2026 · CVE Program (cve.org) e CISA ADP
Source status changed · → Received
Oct 15, 2026 · NIST National Vulnerability Database
Record created in this database
Oct 15, 2026 · NIST National Vulnerability Database
CVE published
Sep 11, 2026 · Linux

Source activity

Repeated readings are counted rather than listed.

1× References added · Oct 19, 2026 – Oct 19, 2026
1× Official description updated · Oct 15, 2026 – Oct 15, 2026

References

9 on the record

git.kernel.org/stable/c/ad3e41855325e55623276660ef20fbc3b8ba087f
NIST National Vulnerability Database
nvd.nist.gov/vuln/detail/CVE-2026-89710
GitHub Security Advisories
git.kernel.org/stable/c/ee5a386cfe60f3f8286de16a9db8e1a08f0bc124
NIST National Vulnerability Database
git.kernel.org/stable/c/36e3f13bf0728f4ce11ee8904cec82a783222f62
NIST National Vulnerability Database
git.kernel.org/stable/c/a080bb69d30f11738d753a60d1eb733d627c2093
NIST National Vulnerability Database
git.kernel.org/stable/c/32ac1b0b7f1cfa0d1a1faf9c72f4154046101070
NIST National Vulnerability Database
git.kernel.org/stable/c/7c5b0e813efd9124760d5fd1bfc6b229f03fb1a2
NIST National Vulnerability Database
git.kernel.org/stable/c/f52188118d319b47d49ee91a897f6afda4879c59
NIST National Vulnerability Database
github.com/advisories/GHSA-84pc-7mxq-h2j8
GitHub Security Advisories

Elsewhere on this site

Linux
every CVE for this vendor

Related CVEs (same products)

Unknown CVE-2026-98869 bpf: Infer zext_dst based on static register liveness analysis 1h
Unknown CVE-2023-7356 Bluetooth: ISO: Copy BASE if service data matches EIR_BAA_SERVICE_UUID 1h
Unknown CVE-2026-98866 sched/cache: Introduce task_struct->sched_cache_grp to fix UAF 3d
Unknown CVE-2026-98867 dm-pcache: bound the logical key offset from persistent memory 3d
Unknown CVE-2026-98868 dm-pcache: reject a kset that overruns its segment 3d
Unknown CVE-2026-98856 kprobes: Skip disarmed probes when checking optkprobe overlap 3d

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

No CVSS score published by NVD, the CNA, CISA or GitHub so far.
No fixed version, patch or mitigation documented.
No CISA SSVC assessment.
No CWE classification.
No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2026-89710 is "NFSv4.1: fix layout segment leak on the pnfs_layout_process() forget path", rated Unknown. It affects Linux (Linux); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. EPSS 0.17% estimates the probability of exploitation in 30 days; neither replaces your asset context. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

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