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  4. CVE 2026 89642 cifs call pagecacheisizeextended in cifssetsize
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Back to active CVEs
Unknown severity · Source severity not reportedCVE-2026-89642

cifs: call pagecache_isize_extended() in cifs_setsize() when extendingCVE-2026-89642

Answer in brief

CVE-2026-89642 records a Unknown severity vulnerability in cifs: call pagecache_isize_extended() in cifs_setsize() when extending. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 11, 2026Updated Oct 21, 2026Source checked Oct 27, 2026First seen by HOL Sep 11, 2026Material review Oct 21, 2026
Upstream Advisory

Record context

Vulnerability class
Vulnerability
EPSS
Not reported
CWE IDs
Not reported
Source
CVE List V5
Source checked
Oct 27, 2026
References
5 linked sources
Open source record

Key facts

Risk
Unknown severitySource severity not reported
Exploitation
Not marked as known exploited
Affected software
5 mapped packages or products
Fix availability
Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic), Linux/Linux (generic) and additional mapped packages. Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Linux/Linuxgeneric>=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <12bafe32f09c0d24f5096154b59c347b9c6606e0 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <c510edb9734af1c274d18f4f31a471a166bbc7e8 || >=0 <7.2.412bafe32f09c0d24f5096154b59c347b9c6606e0, c510edb9734af1c274d18f4f31a471a166bbc7e8, 7.2.4
Linux/Linuxgeneric>=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <12bafe32f09c0d24f5096154b59c347b9c6606e0 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <c510edb9734af1c274d18f4f31a471a166bbc7e812bafe32f09c0d24f5096154b59c347b9c6606e0, c510edb9734af1c274d18f4f31a471a166bbc7e8
Linux/Linuxgeneric2.6.12Not reported
Linux/Linuxgeneric>=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <e1f692b6da3e632a25d0b3a99f833bb609bae1a3 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <12bafe32f09c0d24f5096154b59c347b9c6606e0 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <c510edb9734af1c274d18f4f31a471a166bbc7e8e1f692b6da3e632a25d0b3a99f833bb609bae1a3, 12bafe32f09c0d24f5096154b59c347b9c6606e0, c510edb9734af1c274d18f4f31a471a166bbc7e8
Linux/Linuxgeneric>=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <5463d96cd2e46064ceefcf861b028745a4f4c373 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <40c16040783abcc240bd1b453e679ea6ca30e19e || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <e1f692b6da3e632a25d0b3a99f833bb609bae1a3 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <12bafe32f09c0d24f5096154b59c347b9c6606e0 || >=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <c510edb9734af1c274d18f4f31a471a166bbc7e85463d96cd2e46064ceefcf861b028745a4f4c373, 40c16040783abcc240bd1b453e679ea6ca30e19e, e1f692b6da3e632a25d0b3a99f833bb609bae1a3, 12bafe32f09c0d24f5096154b59c347b9c6606e0, c510edb9734af1c274d18f4f31a471a166bbc7e8

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux, Linux/Linux.
  2. 2Review the reported fix. Update Linux/Linux to 12bafe32f09c0d24f5096154b59c347b9c6606e0; Linux/Linux to 12bafe32f09c0d24f5096154b59c347b9c6606e0; Linux/Linux to e1f692b6da3e632a25d0b3a99f833bb609bae1a3; Linux/Linux to 5463d96cd2e46064ceefcf861b028745a4f4c373 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Sep 11, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 21, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Sep 11, 2026

Sources and claim methodology

  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
Upstream source description

In the Linux kernel, the following vulnerability has been resolved: cifs: call pagecache_isize_extended() in cifs_setsize() when extending cifs_setsize() calls truncate_pagecache() but skips pagecache_isize_extended() on extension. truncate_setsize() shows the correct pattern: i_size_write(inode, newsize); if (newsize > oldsize) pagecache_isize_extended(inode, oldsize, newsize); truncate_pagecache(inode, newsize); pagecache_isize_extended() zeroes the tail of the page straddling old EOF. Without it, dirty bytes in that region can be written back to the server, exposing stale data in the newly extended range.

Quoted source text, attributed separately from HOL analysis.