batman-adv: reject oversized global TT response buffers

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Summary

CVECVE-2026-31659
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-24 15:16:45 UTC
Updated2026-04-27 20:17:17 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 9.8 CRITICAL from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS: 0.000240000 probability, percentile 0.067850000 (date 2026-04-27)

Problem Types: NVD-CWE-noinfo

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Operating System Linux Linux Kernel All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 7ea7b4a142758deaf46c1af0ca9ceca6dd55138b 7e5d007e0df946bffb8542fb112e0044014a5897 git Not specified
CNA Linux Linux affected 7ea7b4a142758deaf46c1af0ca9ceca6dd55138b 2997f4bd1f982e7013709946e00be89b507693fa git Not specified
CNA Linux Linux affected 7ea7b4a142758deaf46c1af0ca9ceca6dd55138b 95c71365a2222908441b54d6f2c315e0c79fcec3 git Not specified
CNA Linux Linux affected 7ea7b4a142758deaf46c1af0ca9ceca6dd55138b 69d61639bc7e963c3b645e570279d731e7c89062 git Not specified
CNA Linux Linux affected 7ea7b4a142758deaf46c1af0ca9ceca6dd55138b f970646b9a39539d1bac86822ac78b5915455ea9 git Not specified
CNA Linux Linux affected 7ea7b4a142758deaf46c1af0ca9ceca6dd55138b de6c1dc3c7d01a152607e6fcecee4d5288283f10 git Not specified
CNA Linux Linux affected 7ea7b4a142758deaf46c1af0ca9ceca6dd55138b cf2199171ef799ca7270019125f4a91bd20ad4d9 git Not specified
CNA Linux Linux affected 7ea7b4a142758deaf46c1af0ca9ceca6dd55138b 3a359bf5c61d52e7f09754108309d637532164a6 git Not specified
CNA Linux Linux affected 3.13 Not specified
CNA Linux Linux unaffected 3.13 semver Not specified
CNA Linux Linux unaffected 5.10.253 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.203 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.169 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.135 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.82 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.23 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.13 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/3a359bf5c61d52e7f09754108309d637532164a6 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/7e5d007e0df946bffb8542fb112e0044014a5897 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/de6c1dc3c7d01a152607e6fcecee4d5288283f10 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/cf2199171ef799ca7270019125f4a91bd20ad4d9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/f970646b9a39539d1bac86822ac78b5915455ea9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/95c71365a2222908441b54d6f2c315e0c79fcec3 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/69d61639bc7e963c3b645e570279d731e7c89062 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
git.kernel.org/stable/c/2997f4bd1f982e7013709946e00be89b507693fa 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org Patch
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