CVE-2026-31657

Last refreshed2026-10-17

Status: UPDATED | Advisory ID: CVE-2026-31657

Key Details

CVE	CVE-2026-31657
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
Classified as	CWE-476 (NULL Pointer Dereference)

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:

batman-adv: hold claim backbone gateways by reference

batadv_bla_add_claim() can replace claim->backbone_gw and drop the old

gateway's last reference while readers still follow the pointer.

The netlink claim dump path dereferences claim->backbone_gw->orig and

takes claim->backbone_gw->crc_lock without pinning the underlying

backbone gateway. batadv_bla_check_claim() still has the same naked

pointer access pattern.

Reuse batadv_bla_claim_get_backbone_gw() in both readers so they operate

on a stable gateway reference until the read-side work is complete.

This keeps the dump and claim-check paths aligned with the lifetime

rules introduced for the other BLA claim readers. (NVD)

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

Source	Reference
NVD	https://nvd.nist.gov/vuln/detail/CVE-2026-31657
CVE	https://www.cve.org/CVERecord?id=CVE-2026-31657

Source

Reference

NVD

CVE