CVE-2026-31657

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.

Affected products

Linuxmint, Linux Kernel

Linux Linux Kernel

< 6.1.169, 6.6.135, 6.12.82, 6.18.23, 6.19.13, 3.5, 7.0

CVSS 3.1

9.8 CRITICAL

EPSS

0.4% (33th percentile)

Weakness

CWE-476

NVD status

Modified

Published

2026-04-24

No exploit for CVE-2026-31657 has been indexed yet. Our index is built from live traffic and upstream syncs, so this page can only say what it knows — not that no exploit exists.