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Tracker / CVE-2026-31657

CVE-2026-31657

Critical 9.8

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 and versions

linux linux_kernel
linux linux_kernel · 3.5.1 → 6.1.169
linux linux_kernel · 6.13 → 6.18.23
linux linux_kernel · 6.19 → 6.19.13
linux linux_kernel · 6.2 → 6.6.135
linux linux_kernel · 6.7 → 6.12.82

Analysis

This page is not indexable yet.Until it carries original analysis — what it actually exposes, how to check in two minutes whether a system was touched, what to do if it was — the page stays noindex. The database decides that, not the template.

References