CVE-2026-89653

Last refreshed2026-10-17

Status: UPDATED | Advisory ID: CVE-2026-89653

Key Details

CVE	CVE-2026-89653
CVSS Score / Version	9.8 (Critical) / CVSS v3.1
Updated	2026-10-16
CVSS Vector	`CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`
CVSS Prose	attack vector is network; attack complexity is low; privileges required is none; 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:

ceph: reject export_targets ranks >= CEPH_MAX_MDS in mdsmap decode

MDSMap export_targets entries are monitor controlled. check_new_map()

uses each entry as a bit number in a fixed stack bitmap, so a rank

outside the protocol namespace can make set_bit() write past the end of

the array.

Reject ranks outside CEPH_MAX_MDS while decoding the map. Do not

validate against possible_max_rank here because maps may legitimately

reference ranks beyond a temporarily reduced max_mds. (NVD)

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

Source	Reference
NVD	https://nvd.nist.gov/vuln/detail/CVE-2026-89653
CVE	https://www.cve.org/CVERecord?id=CVE-2026-89653

Source

Reference

NVD

CVE