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CVE-2026-31657

batman-adv: hold claim backbone gateways by reference

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.10.258, 5.15.209, 6.1.169, 6.6.135, 6.12.82, and 2 more
None on Exploit-DB, Metasploit or GitHub
  • Exploitation: none
  • Automatable: yes
  • Technical impact: total

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.

Timeline

  1. CVE published
  2. CISA SSVC assessment

    Exploitation: none · Automatable: yes · Technical impact: total

  3. Record last updated

Affected versions

  • Linux Linux

    From 23721387c409087fd3b97e274f34d3ddc0970b74 · fixed in 5202f071b367ffbc8e279fc7a00db14f5e587f52; From 23721387c409087fd3b97e274f34d3ddc0970b74 · fixed in 69d1ce9c72eca91203ffdb8d08bacd511100aec6; From 23721387c409087fd3b97e274f34d3ddc0970b74 · fixed in f4858832ddef2f39f21e30b7226bbcd3c4b2bc96; From 23721387c409087fd3b97e274f34d3ddc0970b74 · fixed in 2f55b58b5a0bbed192d60c444a45a49cdf1b545f; From 23721387c409087fd3b97e274f34d3ddc0970b74 · fixed in 7962b522222628596ca9ecc8722efc95367aadbd; From 23721387c409087fd3b97e274f34d3ddc0970b74 · fixed in 4dee4c0688443aaf5bbec74aa203c851d1d53c35; From 23721387c409087fd3b97e274f34d3ddc0970b74 · fixed in 1f2dc36c297d27733f1b380ea644cf15a361bd7b; From 23721387c409087fd3b97e274f34d3ddc0970b74 · fixed in 82d8701b2c930d0e96b0dbc9115a218d791cb0d2

  • Linux Linux

    3.5

  • KernelLinux

    From 3.5.0 · fixed in 5.10.258; From 5.11.0 · fixed in 5.15.209; From 5.16.0 · fixed in 6.1.169; From 6.2.0 · fixed in 6.6.135; From 6.7.0 · fixed in 6.12.82; From 6.13.0 · fixed in 6.18.23; From 6.19.0 · fixed in 6.19.13

References 8

git.kernel.org