CVE-2026-72235 (GCVE-0-2026-72235)
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: retrieve ethhdr after potential skb realloc on RX
pskb_may_pull() in batadv_interface_rx() 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 VLAN header but missed for the ethernet
header which is later used for the TT and AP isolation handling.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Version: c6c8fea29769d998d94fcec9b9f14d4b52b349d3 Version: c6c8fea29769d998d94fcec9b9f14d4b52b349d3 Version: c6c8fea29769d998d94fcec9b9f14d4b52b349d3 Version: c6c8fea29769d998d94fcec9b9f14d4b52b349d3 Version: c6c8fea29769d998d94fcec9b9f14d4b52b349d3 Version: c6c8fea29769d998d94fcec9b9f14d4b52b349d3 Version: c6c8fea29769d998d94fcec9b9f14d4b52b349d3 Version: c6c8fea29769d998d94fcec9b9f14d4b52b349d3 |
||
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"net/batman-adv/mesh-interface.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
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"status": "affected",
"version": "c6c8fea29769d998d94fcec9b9f14d4b52b349d3",
"versionType": "git"
},
{
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"status": "affected",
"version": "c6c8fea29769d998d94fcec9b9f14d4b52b349d3",
"versionType": "git"
},
{
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"status": "affected",
"version": "c6c8fea29769d998d94fcec9b9f14d4b52b349d3",
"versionType": "git"
},
{
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"status": "affected",
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{
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}
]
},
{
"defaultStatus": "affected",
"product": "Linux",
"programFiles": [
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],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "2.6.38"
},
{
"lessThan": "2.6.38",
"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": "2.6.38",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.15.212",
"versionStartIncluding": "2.6.38",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "2.6.38",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.12.97",
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"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.18.40",
"versionStartIncluding": "2.6.38",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.1.5",
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"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.2",
"versionStartIncluding": "2.6.38",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbatman-adv: retrieve ethhdr after potential skb realloc on RX\n\npskb_may_pull() in batadv_interface_rx() could reallocate the buffer behind\nthe 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 VLAN header but missed for the ethernet\nheader which is later used for the TT and AP isolation handling."
}
],
"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 - Exploitation requires delivering crafted ETH_P_BATMAN frames on the victim\u0027s batman-adv mesh hard interface (802.11/wired L2 mesh), reachable from any adjacent mesh peer without local shell access.\nAC:L - The attacker fully controls remote batman-adv packet contents (VLAN-encapsulated payload and skb layout) and can repeatedly send unicast/broadcast frames to reliably force pskb_may_pull() skb reallocation.\nPR:N - No privileges on the victim are required; any unauthenticated remote mesh participant that can inject batman-adv RX frames onto an active mesh node can reach batadv_interface_rx().\nUI:N - Exploitation is triggered solely by the attacker sending malicious mesh packets; no victim user action (mounting, clicking, or configuration changes) is needed at exploit time.\nS:U - Impact is kernel memory corruption and potential privilege escalation on the mesh node; it does not cross a VM/host, IOMMU, or sandbox security boundary.\nC:H - Stale ethhdr after skb realloc is a use-after-free read of freed skb data; attacker-influenced bytes from ethhdr-\u003eh_source/h_dest are consumed by TT and AP-isolation logic, enabling arbitrary kernel memory disclosure.\nI:H - UAF-supplied MAC data is copied into translation-table heap objects via batadv_tt_add_temporary_global_entry()/batadv_tt_global_add(), providing a memory-corruption primitive suitable for control-flow or data hijacking.\nA:H - Use-after-free on the RX path can cause kernel oops/panic from dereferencing freed skb buffer memory during TT/AP-isolation handling, even before full exploitation."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-17T05:41:52.969Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/6e189f14d1ea28db212b9d70a02131a7ce518012"
},
{
"url": "https://git.kernel.org/stable/c/a1820344b180cb55af748f102bc536b5c93164db"
},
{
"url": "https://git.kernel.org/stable/c/6abf73589bed3f27ee240c08108feb72bed0b9c6"
},
{
"url": "https://git.kernel.org/stable/c/f19259395b44af67f3c274e34237c295b526b859"
},
{
"url": "https://git.kernel.org/stable/c/2cefa5141cab8ec1e4b24cf585958b13f2e3049d"
},
{
"url": "https://git.kernel.org/stable/c/85a71a81854e0e191ad0e533eabb4eff54866feb"
},
{
"url": "https://git.kernel.org/stable/c/b031fc97e1993d29d6c3a0e86a99140528cf31e8"
},
{
"url": "https://git.kernel.org/stable/c/035e1fed892d3d06002a73ff73668f618a514644"
}
],
"title": "batman-adv: retrieve ethhdr after potential skb realloc on RX",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-72235",
"datePublished": "2026-08-15T05:54:25.136Z",
"dateReserved": "2026-08-09T03:40:39.914Z",
"dateUpdated": "2026-08-17T05:41:52.969Z",
"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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