CVE-2026-72234 (GCVE-0-2026-72234)
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: access unicast_ttvn skb->data 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.
This was done correctly for the ethernet header but missed for the
unicast_packet pointer.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Version: c018ad3de61a1dc4194879a53e5559e094aa7b1a Version: c018ad3de61a1dc4194879a53e5559e094aa7b1a Version: c018ad3de61a1dc4194879a53e5559e094aa7b1a Version: c018ad3de61a1dc4194879a53e5559e094aa7b1a Version: c018ad3de61a1dc4194879a53e5559e094aa7b1a Version: c018ad3de61a1dc4194879a53e5559e094aa7b1a Version: c018ad3de61a1dc4194879a53e5559e094aa7b1a Version: c018ad3de61a1dc4194879a53e5559e094aa7b1a |
||
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"net/batman-adv/routing.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "aa9558af859934f24717d4bab97d61004f91a736",
"status": "affected",
"version": "c018ad3de61a1dc4194879a53e5559e094aa7b1a",
"versionType": "git"
},
{
"lessThan": "9c2c05629e46c1fd43931506d41c56a885a98eb4",
"status": "affected",
"version": "c018ad3de61a1dc4194879a53e5559e094aa7b1a",
"versionType": "git"
},
{
"lessThan": "7b162b36de750565404cd3b98315706622c6974f",
"status": "affected",
"version": "c018ad3de61a1dc4194879a53e5559e094aa7b1a",
"versionType": "git"
},
{
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"status": "affected",
"version": "c018ad3de61a1dc4194879a53e5559e094aa7b1a",
"versionType": "git"
},
{
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"status": "affected",
"version": "c018ad3de61a1dc4194879a53e5559e094aa7b1a",
"versionType": "git"
},
{
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"status": "affected",
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"versionType": "git"
},
{
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"status": "affected",
"version": "c018ad3de61a1dc4194879a53e5559e094aa7b1a",
"versionType": "git"
},
{
"lessThan": "7141990add3f75436f2933cb310654cad3b1e3e9",
"status": "affected",
"version": "c018ad3de61a1dc4194879a53e5559e094aa7b1a",
"versionType": "git"
}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
"net/batman-adv/routing.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: access unicast_ttvn skb-\u003edata 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.\n\nThis was done correctly for the ethernet header but missed for the\nunicast_packet pointer."
}
],
"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 - Triggered in batadv_check_unicast_ttvn() when batadv_batman_skb_recv() processes incoming BATADV unicast packets from remote mesh peers on hard interfaces; crafted batman-adv frames reach the vulnerable code over the mesh network without local system access.\nAC:L - An attacker reliably triggers the UAF by sending a batman-adv unicast packet with a VLAN-tagged embedded Ethernet header to a victim node; packet fields are attacker-controlled and can force batadv_get_vid()\u0027s pskb_may_pull() to reallocate the skb buffer.\nPR:N - No privileges are required on the victim host; exploitation only needs batman-adv active on an interface while the attacker acts as an unauthenticated mesh peer able to transmit batman-adv protocol frames to the target node.\nUI:N - No victim user interaction is needed; the kernel automatically processes the malicious batman-adv unicast packet on receive through the normal mesh routing receive path.\nS:U - The use-after-free corrupts kernel heap memory within the same host networking subsystem and does not cross VM, container, or IOMMU boundaries to impact a separate security authority.\nC:H - The stale unicast_packet pointer dereferences freed skb buffer memory for reads (unicast_packet-\u003edest, unicast_packet-\u003ettvn), constituting a kernel heap use-after-free that can disclose sensitive memory contents.\nI:H - The stale pointer is used for writes via ether_addr_copy(unicast_packet-\u003edest) and unicast_packet-\u003ettvn updates in reroute paths, enabling heap corruption and potential arbitrary kernel code execution.\nA:H - Use-after-free on the skb data buffer during batman-adv unicast processing can cause kernel oops, panic, or hang, and UAF heap corruption inherently threatens system availability even before full exploit development."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-17T05:41:51.879Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/aa9558af859934f24717d4bab97d61004f91a736"
},
{
"url": "https://git.kernel.org/stable/c/9c2c05629e46c1fd43931506d41c56a885a98eb4"
},
{
"url": "https://git.kernel.org/stable/c/7b162b36de750565404cd3b98315706622c6974f"
},
{
"url": "https://git.kernel.org/stable/c/ed90eb5c68420cdfe67ec1f773324198d2ef6f50"
},
{
"url": "https://git.kernel.org/stable/c/979175834a699ccc3c4c0b0ba60ecae0f135a587"
},
{
"url": "https://git.kernel.org/stable/c/b8afcf799b2cc92c41beebd029e53ed18960184a"
},
{
"url": "https://git.kernel.org/stable/c/9a7b7248798123efbd5fafe58461d57c7cc718af"
},
{
"url": "https://git.kernel.org/stable/c/7141990add3f75436f2933cb310654cad3b1e3e9"
}
],
"title": "batman-adv: access unicast_ttvn skb-\u003edata only after skb realloc",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-72234",
"datePublished": "2026-08-15T05:54:24.395Z",
"dateReserved": "2026-08-09T03:40:39.914Z",
"dateUpdated": "2026-08-17T05:41:51.879Z",
"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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