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.

No CVSS v4.0

Attack Vector Network

Attack Complexity Low

Privileges Required Low

Scope Unchanged

Confidentiality Impact High

Integrity Impact None

Availability Impact None

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Key SSVC decision points have not yet been added.

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
Linux Linux unaffected
Version Status Constraints
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 affected < 12bafe32f09c0d24f5096154b59c347b9c6606e0
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 affected < c510edb9734af1c274d18f4f31a471a166bbc7e8
0 affected < 7.2.4
Linux Linux affected
Version Status Constraints
7.2.4 unaffected ≤ 7.2.*
7.3-rc1 unaffected ≤ *

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Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://git.kernel.org/stable/c/12bafe32f09c0d24f5096154b59c347b9c6606e0 cve-icon cve-icon cve-icon
https://git.kernel.org/stable/c/c510edb9734af1c274d18f4f31a471a166bbc7e8 cve-icon cve-icon cve-icon
https://nvd.nist.gov/vuln/detail/CVE-2026-89642 cve-icon
https://www.cve.org/CVERecord?id=CVE-2026-89642 cve-icon
History

Sat, 12 Sep 2026 00:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-201
References
Metrics threat_severity

None

 cvssV3_1

{'score': 6.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N'}

threat_severity

Moderate

Fri, 11 Sep 2026 23:45:00 +0000

Type Values Removed Values Added
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.
Title cifs: call pagecache_isize_extended() in cifs_setsize() when extending
First Time appeared Linux
Linux linux Kernel
CPEs cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Vendors & Products Linux
Linux linux Kernel
References

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published:

Updated: 2026-09-11T19:45:34.778Z

Reserved: 2026-09-11T19:38:34.741Z

Link: CVE-2026-89642

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-09-11T20:19:49.980

Modified: 2026-09-11T20:19:49.980

Link: CVE-2026-89642

cve-icon Redhat

Severity : Moderate

Publid Date: 2026-09-11T19:45:34Z

Links: CVE-2026-89642 - Bugzilla

cve-icon OpenCVE Enrichment

Updated: 2026-09-12T05:00:08Z

Weaknesses