CVE-2026-89639

Last refreshed2026-10-19

Status: UPDATED | Advisory ID: CVE-2026-89639

Key Details

CVE	CVE-2026-89639
CVSS Score / Version	7.1 (High) / CVSS v3.1
Updated	2026-10-19
CVSS Vector	`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N`
CVSS Prose	attack vector is local; attack complexity is low; privileges required is low; user interaction is none; scope is unchanged; confidentiality impact is high; integrity impact is high; availability impact is none.
Affected products	Linux Kernel

Vendor	Product	Affected Versions	Patch Status
Linux	Linux Kernel

Vendor

Product

Affected Versions

Patch Status

Linux

Linux Kernel

Subsystems	OT Supporting Infrastructure
Sectors	All Sectors

In the Linux kernel, the following vulnerability has been resolved:

cifs: use cifs_invalidate_cache() in cifs_do_truncate() for O_TRUNC

cifs_do_truncate() is invoked from cifs_open() without i_rwsem, so it

cannot use cifs_resize_file_locked() to perform a proper fscache cookie

resize. Instead, add cifs_invalidate_cache() after cifs_setsize().

cifs_invalidate_cache() calls fscache_invalidate(), which works without

holding i_rwsem: it unconditionally increments inval_counter and sets

FSCACHE_COOKIE_NO_DATA_TO_READ, ensuring that stale cached data is not

served once the cookie is later activated by fscache_use_cookie().

Truncation to zero leaves no valid cached data, making invalidation the

correct semantic here. (NVD)

Monitor Linux's web page for any future patch releases.

Source	Reference
NVD	https://nvd.nist.gov/vuln/detail/CVE-2026-89639
CVE	https://www.cve.org/CVERecord?id=CVE-2026-89639

Source

Reference

NVD

CVE