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CVE-2026-31659

batman-adv: reject oversized global TT response buffers

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.10.253, 5.15.203, 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: reject oversized global TT response buffers batadv_tt_prepare_tvlv_global_data() builds the allocation length for a global TT response in 16-bit temporaries. When a remote originator advertises a large enough global TT, the TT payload length plus the VLAN header offset can exceed 65535 and wrap before kmalloc(). The full-table response path still uses the original TT payload length when it fills tt_change, so the wrapped allocation is too small and batadv_tt_prepare_tvlv_global_data() writes past the end of the heap object before the later packet-size check runs. Fix this by rejecting TT responses whose TVLV value length cannot fit in the 16-bit TVLV payload length field.

Timeline

  1. CVE published
  2. CISA SSVC assessment

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

  3. Record last updated

Affected versions

  • Linux Linux

    From 7ea7b4a142758deaf46c1af0ca9ceca6dd55138b · fixed in 7e5d007e0df946bffb8542fb112e0044014a5897; From 7ea7b4a142758deaf46c1af0ca9ceca6dd55138b · fixed in 2997f4bd1f982e7013709946e00be89b507693fa; From 7ea7b4a142758deaf46c1af0ca9ceca6dd55138b · fixed in 95c71365a2222908441b54d6f2c315e0c79fcec3; From 7ea7b4a142758deaf46c1af0ca9ceca6dd55138b · fixed in 69d61639bc7e963c3b645e570279d731e7c89062; From 7ea7b4a142758deaf46c1af0ca9ceca6dd55138b · fixed in f970646b9a39539d1bac86822ac78b5915455ea9; From 7ea7b4a142758deaf46c1af0ca9ceca6dd55138b · fixed in de6c1dc3c7d01a152607e6fcecee4d5288283f10; From 7ea7b4a142758deaf46c1af0ca9ceca6dd55138b · fixed in cf2199171ef799ca7270019125f4a91bd20ad4d9; From 7ea7b4a142758deaf46c1af0ca9ceca6dd55138b · fixed in 3a359bf5c61d52e7f09754108309d637532164a6

  • Linux Linux

    3.13

  • KernelLinux

    From 3.13.0 · fixed in 5.10.253; From 5.11.0 · fixed in 5.15.203; 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