CVE-2026-31659batman-adv: reject oversized global TT response buffers
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 9.8 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Analyzed
- Record last updated
- Oct 16, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | 7ea7b4a142758deaf46c1af0ca9ceca6dd55138b builds before 7e5d007e0df946bffb8542fb112e0044014a5897; from 7ea7b4a142758deaf46c1af0ca9ceca6dd55138b before 2997f4bd1f982e7013709946e00be89b507693fa; from 7ea7b4a142758deaf46c1af0ca9ceca6dd55138b before 95c71365a2222908441b54d6f2c315e0c79fcec3; from 7ea7b4a142758deaf46c1af0ca9ceca6dd55138b before 69d61639bc7e963c3b645e570279d731e7c89062; from 7ea7b4a142758deaf46c1af0ca9ceca6dd55138b before f970646b9a39539d1bac86822ac78b5915455ea9; from 7ea7b4a142758deaf46c1af0ca9ceca6dd55138b before de6c1dc3c7d01a152607e6fcecee4d5288283f10; from 7ea7b4a142758deaf46c1af0ca9ceca6dd55138b before cf2199171ef799ca7270019125f4a91bd20ad4d9; 7ea7b4a142758deaf46c1af0ca9ceca6dd55138b builds before 3a359bf5c61d52e7f09754108309d637532164a6 | CNA record |
linux linux_kernel linux:linux_kernel | from 3.13.1 before 5.10.253; from 5.11 before 5.15.203; from 5.16 before 6.1.169; from 6.2 before 6.6.135; from 6.7 before 6.12.82; from 6.13 before 6.18.23; from 6.19 before 6.19.13; 3.13; and 7 more ranges | NVD |
References
- https://git.kernel.org/stable/c/7e5d007e0df946bffb8542fb112e0044014a5897patch
- https://git.kernel.org/stable/c/2997f4bd1f982e7013709946e00be89b507693fapatch
- https://git.kernel.org/stable/c/95c71365a2222908441b54d6f2c315e0c79fcec3patch
- https://git.kernel.org/stable/c/69d61639bc7e963c3b645e570279d731e7c89062patch
- https://git.kernel.org/stable/c/f970646b9a39539d1bac86822ac78b5915455ea9patch
- https://git.kernel.org/stable/c/de6c1dc3c7d01a152607e6fcecee4d5288283f10patch
- https://git.kernel.org/stable/c/cf2199171ef799ca7270019125f4a91bd20ad4d9patch
- https://git.kernel.org/stable/c/3a359bf5c61d52e7f09754108309d637532164a6patch
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.