CVE-2026-72226 (GCVE-0-2026-72226)
Vulnerability from cvelistv5
Published
2026-08-15 05:54
Modified
2026-08-17 05:41
Severity ?
VLAI Severity ?
EPSS score ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
batman-adv: tt: prevent TVLV OOB check overflow
A TT unicast TVLV contains the number of VLANs stored in it. This number is
an u16 and gets multiplied by the size of the struct
batadv_tvlv_tt_vlan_data (8 bytes). The size can therefore overflow the u16
used to store the tt_vlan_len. All additional safety checks to prevent
out-of-bounds access of the TVLV buffer are invalid due to this overflow.
Using size_t prevents this overflow and ensures that the safety checks
compare against the actual buffer requirements.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Version: 7ea7b4a142758deaf46c1af0ca9ceca6dd55138b Version: 7ea7b4a142758deaf46c1af0ca9ceca6dd55138b Version: 7ea7b4a142758deaf46c1af0ca9ceca6dd55138b Version: 7ea7b4a142758deaf46c1af0ca9ceca6dd55138b Version: 7ea7b4a142758deaf46c1af0ca9ceca6dd55138b Version: 7ea7b4a142758deaf46c1af0ca9ceca6dd55138b Version: 7ea7b4a142758deaf46c1af0ca9ceca6dd55138b Version: 7ea7b4a142758deaf46c1af0ca9ceca6dd55138b |
||
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"net/batman-adv/translation-table.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "0de12a4c4847f571d82a9cd96bc633eded41d7c6",
"status": "affected",
"version": "7ea7b4a142758deaf46c1af0ca9ceca6dd55138b",
"versionType": "git"
},
{
"lessThan": "d6ff4764ff784ede25f5c83a6f5883a74c93a5ea",
"status": "affected",
"version": "7ea7b4a142758deaf46c1af0ca9ceca6dd55138b",
"versionType": "git"
},
{
"lessThan": "1898273c5dc8148267ef9f97cd2517a2822350e7",
"status": "affected",
"version": "7ea7b4a142758deaf46c1af0ca9ceca6dd55138b",
"versionType": "git"
},
{
"lessThan": "604bd5042fbcd1ab9f7cd98fd847ec017aeede8a",
"status": "affected",
"version": "7ea7b4a142758deaf46c1af0ca9ceca6dd55138b",
"versionType": "git"
},
{
"lessThan": "7319c0794f91be2734aac695794e7203606b49f8",
"status": "affected",
"version": "7ea7b4a142758deaf46c1af0ca9ceca6dd55138b",
"versionType": "git"
},
{
"lessThan": "3256c05d5a9db34346eaf20f52dddde984852d77",
"status": "affected",
"version": "7ea7b4a142758deaf46c1af0ca9ceca6dd55138b",
"versionType": "git"
},
{
"lessThan": "6222b443686525cb5a9b6a9cecf23b2e2ab23e2a",
"status": "affected",
"version": "7ea7b4a142758deaf46c1af0ca9ceca6dd55138b",
"versionType": "git"
},
{
"lessThan": "7a581d9aaba8c82bd6177fa36b2588eea77f6e2b",
"status": "affected",
"version": "7ea7b4a142758deaf46c1af0ca9ceca6dd55138b",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"net/batman-adv/translation-table.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "3.13"
},
{
"lessThan": "3.13",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"version": "5.10.261",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.212",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.178",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.145",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.97",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.40",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.1.*",
"status": "unaffected",
"version": "7.1.5",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.10.261",
"versionStartIncluding": "3.13",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.15.212",
"versionStartIncluding": "3.13",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.1.178",
"versionStartIncluding": "3.13",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.6.145",
"versionStartIncluding": "3.13",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.12.97",
"versionStartIncluding": "3.13",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.18.40",
"versionStartIncluding": "3.13",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.1.5",
"versionStartIncluding": "3.13",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.2",
"versionStartIncluding": "3.13",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbatman-adv: tt: prevent TVLV OOB check overflow\n\nA TT unicast TVLV contains the number of VLANs stored in it. This number is\nan u16 and gets multiplied by the size of the struct\nbatadv_tvlv_tt_vlan_data (8 bytes). The size can therefore overflow the u16\nused to store the tt_vlan_len. All additional safety checks to prevent\nout-of-bounds access of the TVLV buffer are invalid due to this overflow.\n\nUsing size_t prevents this overflow and ensures that the safety checks\ncompare against the actual buffer requirements."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 9.8,
"baseSeverity": "CRITICAL",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"scenarios": [
{
"lang": "en",
"value": "AV:N - Crafted BATADV_UNICAST_TVLV frames from remote mesh peers reach batadv_tt_tvlv_unicast_handler_v1() via batadv_batman_skb_recv() \u2192 batadv_recv_unicast_tvlv() \u2192 batadv_tvlv_containers_process() without local syscall or ioctl access on the victim.\nAC:L - An attacker reliably bypasses TVLV bounds checks by setting num_vlan so flex_array_size() overflows the u16 tt_vlan_len (e.g. 8192 VLANs wraps length to 4); all packet fields are attacker-controlled with no races or victim-state dependencies.\nPR:N - batman-adv TVLV receive processing performs no authentication or capability check on senders; any unauthenticated mesh peer injecting ETH_P_BATMAN unicast TVLV frames to an active mesh node triggers the vulnerable path without Linux credentials on the victim.\nUI:N - Exploitation is triggered solely by the attacker transmitting malicious mesh packets; no victim mount, click, or runtime configuration change is required beyond batman-adv already being active on a mesh interface.\nS:U - Out-of-bounds reads and translation-table corruption occur within the victim kernel networking subsystem on the mesh node; the flaw does not cross VM, container, IOMMU, or other separate security-authority boundaries.\nC:H - Overflowed tt_vlan_len invalidates the length check, so batadv_handle_tt_response() offsets tt_change by struct_size() far beyond the skb and _batadv_tt_update_changes() performs out-of-bounds reads of kernel memory for each computed entry.\nI:H - Out-of-bounds tt_change data drives batadv_tt_global_add()/batadv_tt_global_del() and batadv_tt_fill_gtable(), writing attacker-influenced or leaked bytes into kmalloc-backed translation-table objects suitable for heap corruption and control-flow hijacking.\nA:H - Dereferencing tt_change pointers tens of kilobytes past the packet buffer can cause kernel oops or panic, and corrupt translation-table updates can destabilize or disable mesh routing on the victim node."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-17T05:41:46.404Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/0de12a4c4847f571d82a9cd96bc633eded41d7c6"
},
{
"url": "https://git.kernel.org/stable/c/d6ff4764ff784ede25f5c83a6f5883a74c93a5ea"
},
{
"url": "https://git.kernel.org/stable/c/1898273c5dc8148267ef9f97cd2517a2822350e7"
},
{
"url": "https://git.kernel.org/stable/c/604bd5042fbcd1ab9f7cd98fd847ec017aeede8a"
},
{
"url": "https://git.kernel.org/stable/c/7319c0794f91be2734aac695794e7203606b49f8"
},
{
"url": "https://git.kernel.org/stable/c/3256c05d5a9db34346eaf20f52dddde984852d77"
},
{
"url": "https://git.kernel.org/stable/c/6222b443686525cb5a9b6a9cecf23b2e2ab23e2a"
},
{
"url": "https://git.kernel.org/stable/c/7a581d9aaba8c82bd6177fa36b2588eea77f6e2b"
}
],
"title": "batman-adv: tt: prevent TVLV OOB check overflow",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-72226",
"datePublished": "2026-08-15T05:54:18.285Z",
"dateReserved": "2026-08-09T03:40:39.913Z",
"dateUpdated": "2026-08-17T05:41:46.404Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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