CVE-2026-89642

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.

Package Linux Kernel
Published 2026-09-11
Last modified 2026-09-13
Patch available
Yes

Affected versions

Linux kernel versions 2.6.12 and later are affected. Fixed in 7.2.4, 7.3-rc1 and their respective stable series.

Affected from
≥ 2.6.12
Fixed in
✓ 7.2.4 7.2.x ✓ 7.3-rc1

References

2 total

Frequently asked questions

  • What is CVE-2026-89642?

    CVE-2026-89642 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 2.6.12 onward and has been patched in 7.2.4 and 7.3-rc1. CVE-2026-89642 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

  • Is there a patch available for CVE-2026-89642?

    Yes. CVE-2026-89642 has been patched. Fixed versions include 7.2.4 and 7.3-rc1. If you are running Linux kernel 2.6.12 or later up to the fix versions, apply the relevant patch for your kernel branch.

  • Is CVE-2026-89642 actively exploited?

    No. CVE-2026-89642 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.

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