CVE-2026-31657 (GCVE-0-2026-31657)
Vulnerability from cvelistv5
Published
2026-04-24 14:45
Modified
2026-10-19 18:56
Severity ?
9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: 23721387c409087fd3b97e274f34d3ddc0970b74
Version: 23721387c409087fd3b97e274f34d3ddc0970b74
Version: 23721387c409087fd3b97e274f34d3ddc0970b74
Version: 23721387c409087fd3b97e274f34d3ddc0970b74
Version: 23721387c409087fd3b97e274f34d3ddc0970b74
Version: 23721387c409087fd3b97e274f34d3ddc0970b74
Version: 23721387c409087fd3b97e274f34d3ddc0970b74
Version: 23721387c409087fd3b97e274f34d3ddc0970b74
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  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.