CVE-2026-89965

Last refreshed2026-10-19

Status: UPDATED | Advisory ID: CVE-2026-89965

Key Details

CVE	CVE-2026-89965
CVSS Score / Version	7.8 (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: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:

nvdimm/btt: reject an arena whose nfree is below the lane count

The BTT info block's nfree field, the number of reserve free blocks, is

read from the medium without validation. btt_freelist_init() and

btt_rtt_init() size the per-lane freelist[] and rtt[] arrays by nfree,

but the I/O path indexes them by the lane from nd_region_acquire_lane(),

which is bounded by nd_region->num_lanes (ND_MAX_LANES), not by nfree.

A crafted or foreign arena whose nfree is below the lane count makes

freelist[lane]/rtt[lane] run past the allocation: an out-of-bounds write.

btt.rst documents the nlanes = min(nfree, num_cpus) invariant, which the

code does not currently honor: num_lanes is ND_MAX_LANES regardless of

nfree. Reject an arena whose nfree is below num_lanes at discovery,

before the per-lane arrays are allocated, enforcing that invariant. (NVD)

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

Source	Reference
NVD	https://nvd.nist.gov/vuln/detail/CVE-2026-89965
CVE	https://www.cve.org/CVERecord?id=CVE-2026-89965

Source

Reference

NVD

CVE