CVE-2026-89548

Last refreshed2026-10-17

Status: UPDATED | Advisory ID: CVE-2026-89548

Key Details

CVE	CVE-2026-89548
CVSS Score / Version	7.8 (High) / CVSS v3.1
Updated	2026-10-16
CVSS Vector	`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H`
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 high.
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:

SUNRPC: always drain cache_cleaner before destroying a cache_detail

sunrpc_destroy_cache_detail() only cancels the global cache_cleaner

delayed_work when cache_list is empty. During per-netns teardown

cache_list is never empty because init_net's caches remain registered,

so the cancel never fires. After unlink, the caller proceeds to

cache_destroy_net() which kfrees the cache_detail while cache_clean()

may still hold a dangling pointer to it. The result is a

use-after-free: cache_dequeue() takes cd->queue_lock on freed memory,

and cache_put() dereferences cd->cache_put as a function pointer from

freed slab.

Drop the list_empty guard so that cancel_delayed_work_sync() always

runs, ensuring any in-flight cache_clean() completes before the

cache_detail is freed. Re-arm the cleaner afterwards if other caches

are still registered. (NVD)

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

Source	Reference
NVD	https://nvd.nist.gov/vuln/detail/CVE-2026-89548
CVE	https://www.cve.org/CVERecord?id=CVE-2026-89548

Source

Reference

NVD

CVE