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Review reviewHigh

CVE-2026-22980

Linux Linux, SIMATIC S7-1500 CPU 1518-4 PN/DP MFP, SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP

In the Linux kernel, the following vulnerability has been resolved: nfsd: provide locking for v4_end_grace Writing to v4_end_grace can race with server shutdown and result in memory being accessed after it was freed - reclaim_str_hashtbl in particularly. We cannot hold nfsd_mutex across the nfsd4_end_grace() call as that is held while client_tracking_op->init() is called and that can wait for an upcall to nfsdcltrack which can write to v4_end_grace, resulting in a deadlock. nfsd4_end_grace() is also called by the landromat work queue and this doesn't require locking as server shutdown will...

CVSS
7.8
EPSS
0.13%
3.02% percentile
CISA KEV
Not listed
Published
2026.01.24
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.13%
Technical severityCVSS 7.8

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: nfsd: provide locking for v4_end_grace Writing to v4_end_grace can race with server shutdown and result in memory being accessed after it was freed - reclaim_str_hashtbl in particularly. We cannot hold nfsd_mutex across the nfsd4_end_grace() call as that is held while client_tracking_op->init() is called and that can wait for an upcall to nfsdcltrack which can write to v4_end_grace, resulting in a deadlock. nfsd4_end_grace() is also called by the landromat work queue and this doesn't require locking as server shutdown will...

Affected product and versions

Product
Linux Linux, SIMATIC S7-1500 CPU 1518-4 PN/DP MFP, SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP
Affected versions
>= 7f5ef2e900d9462bf9cffaf6bb246ed87a20a6d6 < ca97360860eb02e3ae4ba42c19b439a0fcecbf06, >= 7f5ef2e900d9462bf9cffaf6bb246ed87a20a6d6 < e8bfa2401d4c51eca6e48e9b33c798828ca9df61, >= 7f5ef2e900d9462bf9cffaf6bb246ed87a20a6d6 < 34eb22836e0cdba093baac66599d68c4cd245a9d, >= 7f5ef2e900d9462bf9cffaf6bb246ed87a20a6d6 < 06600719d0f7a723811c45e4d51f5b742f345309, >= 7f5ef2e900d9462bf9cffaf6bb246ed87a20a6d6 < ba4811c8b433bfa681729ca42cc62b6034f223b0, >= 7f5ef2e900d9462bf9cffaf6bb246ed87a20a6d6 < 53f07d095e7e680c5e4569a55a019f2c0348cdc6, >= 7f5ef2e900d9462bf9cffaf6bb246ed87a20a6d6 < 2857bd59feb63fcf40fe4baf55401baea6b4feb4, >= 3.18, >= V3.1.6, >= 3.18 < 5.10.248, >= 5.11 < 5.15.198, >= 5.16 < 6.1.161, >= 6.2 < 6.6.121, >= 6.7 < 6.12.66, >= 6.13 < 6.18.6, 6.19
Fixed versions
5.10.248, 5.15.198, 6.1.161, 6.6.121, 6.12.66, 6.18.6

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux Linux, SIMATIC S7-1500 CPU 1518-4 PN/DP MFP, SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
CWE-416