CVE-2026-89573

Last refreshed2026-10-17

Status: UPDATED | Advisory ID: CVE-2026-89573

Key Details

CVE	CVE-2026-89573
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:

dm array: reject an array block whose value size is not the caller's

array_block_check() can only compare the header against itself, so a block

with value_size 4 and max_entries 1018 is internally consistent and passes.

dm-cache keeps two arrays -- mappings at 8 bytes and hints at 4 -- and the

roots for both live in the superblock. Point the mappings root at a hint

block and __load_mappings() walks it through an info whose value size is 8,

so element_at() strides 8 bytes over 4-byte entries and reaches offset 8160

of a 4096-byte block.

get_ablock() and __shadow_ablock() are the two places that hold the block

and the caller at once. Reject there when the two value sizes disagree.

Arrays only ever read their own blocks, so this fires on crafted metadata

only. (NVD)

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

Source	Reference
NVD	https://nvd.nist.gov/vuln/detail/CVE-2026-89573
CVE	https://www.cve.org/CVERecord?id=CVE-2026-89573

Source

Reference

NVD

CVE