CVE-2026-80601 (GCVE-0-2026-80601)
Vulnerability from cvelistv5
Published
2026-08-28 06:48
Modified
2026-08-29 06:21
Severity ?
VLAI Severity ?
EPSS score ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
batman-adv: gw: acquire ethernet header only after skb realloc
The pskb_may_pull() called by batadv_get_vid() could reallocate the buffer
behind the skb. Variables which were pointing to the old buffer need to be
reassigned to avoid an use-after-free.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Version: 6c413b1c22a2c4ef324f1c6f2c282f1ca10a93b9 Version: 6c413b1c22a2c4ef324f1c6f2c282f1ca10a93b9 Version: 6c413b1c22a2c4ef324f1c6f2c282f1ca10a93b9 Version: 6c413b1c22a2c4ef324f1c6f2c282f1ca10a93b9 Version: 6c413b1c22a2c4ef324f1c6f2c282f1ca10a93b9 Version: 6c413b1c22a2c4ef324f1c6f2c282f1ca10a93b9 Version: 6c413b1c22a2c4ef324f1c6f2c282f1ca10a93b9 Version: 6c413b1c22a2c4ef324f1c6f2c282f1ca10a93b9 |
||
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"net/batman-adv/gateway_client.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "2760b38222c8828b075802342fe3b91eb823d542",
"status": "affected",
"version": "6c413b1c22a2c4ef324f1c6f2c282f1ca10a93b9",
"versionType": "git"
},
{
"lessThan": "6c37f1166549c999ccd164b0cb6462d1ae68f8f6",
"status": "affected",
"version": "6c413b1c22a2c4ef324f1c6f2c282f1ca10a93b9",
"versionType": "git"
},
{
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"status": "affected",
"version": "6c413b1c22a2c4ef324f1c6f2c282f1ca10a93b9",
"versionType": "git"
},
{
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"status": "affected",
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"versionType": "git"
},
{
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"status": "affected",
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"versionType": "git"
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{
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},
{
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"status": "affected",
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"versionType": "git"
},
{
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"status": "affected",
"version": "6c413b1c22a2c4ef324f1c6f2c282f1ca10a93b9",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"net/batman-adv/gateway_client.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "3.14"
},
{
"lessThan": "3.14",
"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": "3.14",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.15.212",
"versionStartIncluding": "3.14",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.1.178",
"versionStartIncluding": "3.14",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.6.145",
"versionStartIncluding": "3.14",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.12.97",
"versionStartIncluding": "3.14",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.18.40",
"versionStartIncluding": "3.14",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.1.5",
"versionStartIncluding": "3.14",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.2",
"versionStartIncluding": "3.14",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbatman-adv: gw: acquire ethernet header only after skb realloc\n\nThe pskb_may_pull() called by batadv_get_vid() could reallocate the buffer\nbehind the skb. Variables which were pointing to the old buffer need to be\nreassigned to avoid an use-after-free."
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 8.8,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"scenarios": [
{
"lang": "en",
"value": "AV:A - The bug is hit only in batadv_interface_tx on outgoing bat0 traffic; the highest-impact path is an unauthenticated client on the same WiFi/LAN segment bridged to a batman-adv gateway node sending a crafted VLAN-tagged DHCP packet into bat0.\nAC:L - Triggering is synchronous and attacker-controlled: a VLAN-tagged DHCP discover/request shaped to force pskb_may_pull() skb reallocation deterministically hits the stale ethhdr UAF without races or victim-specific timing.\nPR:N - No privileges on the mesh router are required when a client on a bridged WiFi/LAN port injects the malicious DHCP frame; gateway-client mode is operator configuration, not an attacker privilege.\nUI:N - Exploitation requires no victim interaction beyond normal always-on mesh bridging and DHCP forwarding; the attacker only sends a malicious frame.\nS:U - Impact is kernel memory corruption and potential privilege escalation within the same kernel/host security boundary, not a cross-boundary escape such as VM or sandbox breakout.\nC:H - This is a use-after-free read: after skb reallocation, ethhdr-\u003eh_source/h_dest dereference freed skb head memory, enabling uncontrolled kernel memory disclosure and further exploitation primitives.\nI:H - UAF on skb data can corrupt routing lookups (batadv_transtable_search) and adjacent kernel heap state, providing a standard path to controlled writes and arbitrary kernel code execution.\nA:H - Reading freed skb memory via ethhdr commonly causes kernel oops/panic on the batman-adv gateway node, yielding complete loss of mesh connectivity and host availability."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-29T06:21:13.415Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/2760b38222c8828b075802342fe3b91eb823d542"
},
{
"url": "https://git.kernel.org/stable/c/6c37f1166549c999ccd164b0cb6462d1ae68f8f6"
},
{
"url": "https://git.kernel.org/stable/c/b79884a5567bf788fb76c30832467cf6a56f3c0d"
},
{
"url": "https://git.kernel.org/stable/c/afac8096bde4948e3caa7e4dd733867cfbd3018e"
},
{
"url": "https://git.kernel.org/stable/c/e3f4325e35dd6e76b80665f3510738ce34819753"
},
{
"url": "https://git.kernel.org/stable/c/e6b43acd34b219b807e65096ce207b087942779d"
},
{
"url": "https://git.kernel.org/stable/c/916dac5f2944f63f07f7b501acbea6737dbbed0e"
},
{
"url": "https://git.kernel.org/stable/c/77880a3be88d378d60cc1e8f8ec70430e2ed0518"
}
],
"title": "batman-adv: gw: acquire ethernet header only after skb realloc",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-80601",
"datePublished": "2026-08-28T06:48:27.948Z",
"dateReserved": "2026-08-26T14:34:25.771Z",
"dateUpdated": "2026-08-29T06:21:13.415Z",
"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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