CVE-2026-22980

Local kernel compromise via v4_end_grace shutdown race

Published Jan 23, 2026 · Updated Jan 23, 2026

A use-after-free in Linux Kernel nfsd allows local users to access freed memory by writing v4_end_grace during server shutdown. The control write can reschedule the laundromat work item after shutdown has waited for it, causing nfsd4_end_grace to access the freed reclaim_str_hashtbl. Exploitation requires local access to an nfsd control or helper context; remote NFS clients cannot directly invoke this path.

CVSS severity7.8
High
EPSS probability0.14%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A use-after-free in Linux Kernel nfsd allows local users to access freed memory by writing v4_end_grace during server shutdown. The control write can reschedule the laundromat work item after shutdown has waited for it, causing nfsd4_end_grace to access the freed reclaim_str_hashtbl. Exploitation requires local access to an nfsd control or helper context; remote NFS clients cannot directly invoke this path.

The record

CVE
CVE-2026-22980
Published
Jan 23, 2026
Updated
Jan 23, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-416, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jan 23, 2026CVE publishedPublication date reported by the CVE source.
  2. Jan 23, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=3.18
  2. Affected versionversion=7f5ef2e900d9462bf9cffaf6bb246ed87a20a6d6 <06600719d0f7a723811c45e4d51f5b742f345309
  3. Affected versionversion=7f5ef2e900d9462bf9cffaf6bb246ed87a20a6d6 <2857bd59feb63fcf40fe4baf55401baea6b4feb4
  4. Affected versionversion=7f5ef2e900d9462bf9cffaf6bb246ed87a20a6d6 <34eb22836e0cdba093baac66599d68c4cd245a9d
  5. Affected versionversion=7f5ef2e900d9462bf9cffaf6bb246ed87a20a6d6 <53f07d095e7e680c5e4569a55a019f2c0348cdc6
  6. Affected versionversion=7f5ef2e900d9462bf9cffaf6bb246ed87a20a6d6 <ba4811c8b433bfa681729ca42cc62b6034f223b0
  7. Affected versionversion=7f5ef2e900d9462bf9cffaf6bb246ed87a20a6d6 <ca97360860eb02e3ae4ba42c19b439a0fcecbf06
  8. Affected versionversion=7f5ef2e900d9462bf9cffaf6bb246ed87a20a6d6 <e8bfa2401d4c51eca6e48e9b33c798828ca9df61

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=3.18; version=7f5ef2e900d9462bf9cffaf6bb246ed87a20a6d6 <06600719d0f7a723811c45e4d51f5b742f345309; version=7f5ef2e900d9462bf9cffaf6bb246ed87a20a6d6 <2857bd59feb63fcf40fe4baf55401baea6b4feb4; version=7f5ef2e900d9462bf9cffaf6bb246ed87a20a6d6 <34eb22836e0cdba093baac66599d68c4cd245a9d; version=7f5ef2e900d9462bf9cffaf6bb246ed87a20a6d6 <53f07d095e7e680c5e4569a55a019f2c0348cdc6; version=7f5ef2e900d9462bf9cffaf6bb246ed87a20a6d6 <ba4811c8b433bfa681729ca42cc62b6034f223b0; version=7f5ef2e900d9462bf9cffaf6bb246ed87a20a6d6 <ca97360860eb02e3ae4ba42c19b439a0fcecbf06; version=7f5ef2e900d9462bf9cffaf6bb246ed87a20a6d6 <e8bfa2401d4c51eca6e48e9b33c798828ca9df61

Published CVSS scores

7.8kernel.orgCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-416Use After Free
T1068Exploitation for Privilege Escalation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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