batman-adv: reject oversized global TT response buffers
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.
CVE-2026-31659
Primary source · Revision 1
Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.
Security context
Source reference: cve:CVE-2026-31659
Linux
Source reference: /containers/cna/affected/0/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Linux
Source reference: /containers/cna/affected/1/product
- Affected versions
- Not stated in this record
- Fixed versions
- Not stated in this record
- Prerequisites
- Not stated in this record
Structured affected-version data
Original package identities and version rules from this source.
[
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "7ea7b4a142758deaf46c1af0ca9ceca6dd55138b",
"lessThan": "7e5d007e0df946bffb8542fb112e0044014a5897",
"versionType": "git"
},
{
"status": "affected",
"version": "7ea7b4a142758deaf46c1af0ca9ceca6dd55138b",
"lessThan": "2997f4bd1f982e7013709946e00be89b507693fa",
"versionType": "git"
},
{
"status": "affected",
"version": "7ea7b4a142758deaf46c1af0ca9ceca6dd55138b",
"lessThan": "95c71365a2222908441b54d6f2c315e0c79fcec3",
"versionType": "git"
},
{
"status": "affected",
"version": "7ea7b4a142758deaf46c1af0ca9ceca6dd55138b",
"lessThan": "69d61639bc7e963c3b645e570279d731e7c89062",
"versionType": "git"
},
{
"status": "affected",
"version": "7ea7b4a142758deaf46c1af0ca9ceca6dd55138b",
"lessThan": "f970646b9a39539d1bac86822ac78b5915455ea9",
"versionType": "git"
},
{
"status": "affected",
"version": "7ea7b4a142758deaf46c1af0ca9ceca6dd55138b",
"lessThan": "de6c1dc3c7d01a152607e6fcecee4d5288283f10",
"versionType": "git"
},
{
"status": "affected",
"version": "7ea7b4a142758deaf46c1af0ca9ceca6dd55138b",
"lessThan": "cf2199171ef799ca7270019125f4a91bd20ad4d9",
"versionType": "git"
},
{
"status": "affected",
"version": "7ea7b4a142758deaf46c1af0ca9ceca6dd55138b",
"lessThan": "3a359bf5c61d52e7f09754108309d637532164a6",
"versionType": "git"
}
],
"programFiles": [
"net/batman-adv/translation-table.c"
],
"defaultStatus": "unaffected"
},
{
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"product": "Linux",
"versions": [
{
"status": "affected",
"version": "3.13"
},
{
"status": "unaffected",
"version": "0",
"lessThan": "3.13",
"versionType": "semver"
},
{
"status": "unaffected",
"version": "5.10.253",
"versionType": "semver",
"lessThanOrEqual": "5.10.*"
},
{
"status": "unaffected",
"version": "5.15.203",
"versionType": "semver",
"lessThanOrEqual": "5.15.*"
},
{
"status": "unaffected",
"version": "6.1.169",
"versionType": "semver",
"lessThanOrEqual": "6.1.*"
},
{
"status": "unaffected",
"version": "6.6.135",
"versionType": "semver",
"lessThanOrEqual": "6.6.*"
},
{
"status": "unaffected",
"version": "6.12.82",
"versionType": "semver",
"lessThanOrEqual": "6.12.*"
},
{
"status": "unaffected",
"version": "6.18.23",
"versionType": "semver",
"lessThanOrEqual": "6.18.*"
},
{
"status": "unaffected",
"version": "6.19.13",
"versionType": "semver",
"lessThanOrEqual": "6.19.*"
},
{
"status": "unaffected",
"version": "7.0",
"versionType": "original_commit_for_fix",
"lessThanOrEqual": "*"
}
],
"programFiles": [
"net/batman-adv/translation-table.c"
],
"defaultStatus": "affected"
}
]- Related CVEs
- CVE-2026-31659
Source reference:
/cveMetadata/cveId
Publisher severity
critical
Source reference: /containers/cna/metrics
- Event
- #39940 · Revision 1
- Added to Heist Feed
- Publisher date