CVE-2026-31657Critical· 9.8▾ MidnightIn 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 sti…
▾ Midnight zone — Critical, or high with PoC / in-the-wild
impact 53.9 · likelihood 0.1 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.4%
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.
Linux >= 23721387c409087fd3b97e274f34d3ddc0970b74 < 5202f071b367ffbc8e279fc7a00db14f5e587f52Linux >= 23721387c409087fd3b97e274f34d3ddc0970b74 < 69d1ce9c72eca91203ffdb8d08bacd511100aec6Linux >= 23721387c409087fd3b97e274f34d3ddc0970b74 < f4858832ddef2f39f21e30b7226bbcd3c4b2bc96Linux >= 23721387c409087fd3b97e274f34d3ddc0970b74 < 2f55b58b5a0bbed192d60c444a45a49cdf1b545fLinux >= 23721387c409087fd3b97e274f34d3ddc0970b74 < 7962b522222628596ca9ecc8722efc95367aadbdLinux >= 23721387c409087fd3b97e274f34d3ddc0970b74 < 4dee4c0688443aaf5bbec74aa203c851d1d53c35Linux >= 23721387c409087fd3b97e274f34d3ddc0970b74 < 1f2dc36c297d27733f1b380ea644cf15a361bd7bLinux >= 23721387c409087fd3b97e274f34d3ddc0970b74 < 82d8701b2c930d0e96b0dbc9115a218d791cb0d2Linux 3.5Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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