CVE record · CVE-2026-89642

cifs: call pagecache_isize_extended() in cifs_setsize() when extending

No CVSS scoreEPSS 0.0017 · 6th percentile

Published by the CVE Program (CNA: Linux) at 11 Sept 2026, 19:45 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

Affected products, as the CNA wrote them
Vendor	Product	Versions
Linux	Linux	affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 880e1b5883a5d78d916fa446791c48f28a16719b git affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 5463d96cd2e46064ceefcf861b028745a4f4c373 git affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 40c16040783abcc240bd1b453e679ea6ca30e19e git affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before e1f692b6da3e632a25d0b3a99f833bb609bae1a3 git affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before 12bafe32f09c0d24f5096154b59c347b9c6606e0 git affected 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 to before c510edb9734af1c274d18f4f31a471a166bbc7e8 git Other versions: unaffected
Linux	Linux	affected 2.6.12 unaffected before 2.6.12 semver unaffected 6.1.191 to 6.1., inclusive semver unaffected 6.6.160 to 6.6., inclusive semver unaffected 6.12.114 to 6.12., inclusive semver unaffected 6.18.57 to 6.18., inclusive semver unaffected 7.2.4 to 7.2., inclusive semver unaffected 7.3 to , inclusive original_commit_for_fix Other versions: affected

Identifiers: CVE-2026-89642
CNA: Linux
Tags: Linux kernel
Published: 11 Sept 2026
Updated: 30 Oct 2026

Machine-written summary

Summary written by Claude Haiku from the source advisory. Not reviewed by a person.

The cifs module in the Linux kernel, affected from 2.6.12 until fixed, can write stale dirty page data to the server when a file is extended, exposing old contents in the new range. The source gives few details on what an attacker needs. Upgrade to 6.1.191, 6.6.160, 6.12.114, or 6.18.57, or a later release in those series.

Written 12 Nov 2026.

Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

Severity and exploitation

No source has published a CVSS score for this record yet.

CISA KEV Not listed.
EPSS 0.0017, the 6th percentile, on 14 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

Timeline

This record came from the full history of the CVE Program, published 11 Sept 2026. New records show when each source confirmed them.

Sources

References from the CNA

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.