CVE-2026-72233 (GCVE-0-2026-72233)
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: bla: reacquire gw address after skb realloc
The pskb_may_pull() called by batadv_bla_is_backbone_gw() 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: 9e794b6bf4a2c65d698d7433ddfabc54a5d53a88 Version: 9e794b6bf4a2c65d698d7433ddfabc54a5d53a88 Version: 9e794b6bf4a2c65d698d7433ddfabc54a5d53a88 Version: 9e794b6bf4a2c65d698d7433ddfabc54a5d53a88 Version: 9e794b6bf4a2c65d698d7433ddfabc54a5d53a88 Version: 9e794b6bf4a2c65d698d7433ddfabc54a5d53a88 Version: 9e794b6bf4a2c65d698d7433ddfabc54a5d53a88 Version: 9e794b6bf4a2c65d698d7433ddfabc54a5d53a88 |
||
{
"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": "41819c5467b6eb8ab4567f0ac98702ce9b6abbb1",
"status": "affected",
"version": "9e794b6bf4a2c65d698d7433ddfabc54a5d53a88",
"versionType": "git"
},
{
"lessThan": "a9ab19fbca86b32e9a9ae9e1a63e70a7eab3400f",
"status": "affected",
"version": "9e794b6bf4a2c65d698d7433ddfabc54a5d53a88",
"versionType": "git"
},
{
"lessThan": "4a6673c55752a7aa41e28f51660eb981504ca088",
"status": "affected",
"version": "9e794b6bf4a2c65d698d7433ddfabc54a5d53a88",
"versionType": "git"
},
{
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"status": "affected",
"version": "9e794b6bf4a2c65d698d7433ddfabc54a5d53a88",
"versionType": "git"
},
{
"lessThan": "dc16bbf53cede1baf564bf0c8a861114b64e18b3",
"status": "affected",
"version": "9e794b6bf4a2c65d698d7433ddfabc54a5d53a88",
"versionType": "git"
},
{
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"status": "affected",
"version": "9e794b6bf4a2c65d698d7433ddfabc54a5d53a88",
"versionType": "git"
},
{
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"status": "affected",
"version": "9e794b6bf4a2c65d698d7433ddfabc54a5d53a88",
"versionType": "git"
},
{
"lessThan": "cdf3b5af2bc4431e58629e8ad2086b1e9185c761",
"status": "affected",
"version": "9e794b6bf4a2c65d698d7433ddfabc54a5d53a88",
"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": "4.12"
},
{
"lessThan": "4.12",
"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": "4.12",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.15.212",
"versionStartIncluding": "4.12",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.1.178",
"versionStartIncluding": "4.12",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.6.145",
"versionStartIncluding": "4.12",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.12.97",
"versionStartIncluding": "4.12",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.18.40",
"versionStartIncluding": "4.12",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.1.5",
"versionStartIncluding": "4.12",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.2",
"versionStartIncluding": "4.12",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbatman-adv: bla: reacquire gw address after skb realloc\n\nThe pskb_may_pull() called by batadv_bla_is_backbone_gw() could reallocate\nthe buffer behind the skb. Variables which were pointing to the old buffer\nneed to be reassigned 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 in batadv_recv_unicast_packet() when batman-adv ETH_P_BATMAN frames are received on a mesh hard interface via batadv_batman_skb_recv(); exploitation requires a peer on the same wireless/bridged mesh segment (community, industrial, or gateway meshes), matching adjacent Wi-Fi/L2 reachability rather than arbitrary Internet routing.\nAC:L - An on-mesh attacker fully controls the injected unicast skb (headers, VLAN tagging) to make batadv_bla_is_backbone_gw()\u0027s pskb_may_pull() reallocate the buffer; this is a deterministic use-after-free with no victim-timed race or layout the attacker cannot influence by resending crafted frames.\nPR:N - No account or capability on the victim host is required; any unauthenticated mesh participant (or L2 source spoofer on the mesh/backbone) can send batman-adv unicast packets destined to the victim\u0027s MAC through the normal RX handler without local login or CAP_NET_ADMIN on the target.\nUI:N - The vulnerable path runs automatically in softirq when the mesh interface receives qualifying unicast traffic; the victim operator does not need to mount a filesystem, click a link, or perform any deliberate action beyond running an active batman-adv mesh with bridge loop avoidance enabled.\nS:U - Exploitation corrupts or reads kernel heap memory inside the batman-adv RX path on the same host; it does not cross a VM/hypervisor, container, or IOMMU security boundary to impact a different authority\u0027s resources.\nC:H - After pskb_may_pull() frees the old skb head, the stale orig_addr_gw pointer is read through %pM in batadv_dbg(), constituting a kernel slab use-after-free that can disclose adjacent freed-object contents and is scored as arbitrary-read class per UAF guidance.\nI:H - Use-after-free of skb linear data is heap memory corruption; even though the immediate stale access is for logging, UAF on RX skbs enables spray/reuse of the freed buffer for control of subsequent kernel objects and potential write primitives.\nA:H - Dereferencing a freed skb buffer in interrupt/RX context can trigger KASAN slab-use-after-free reports, kernel oops, or panic on affected builds; any exploitable UAF on the packet receive path is rated high availability impact."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-17T05:41:50.777Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/41819c5467b6eb8ab4567f0ac98702ce9b6abbb1"
},
{
"url": "https://git.kernel.org/stable/c/a9ab19fbca86b32e9a9ae9e1a63e70a7eab3400f"
},
{
"url": "https://git.kernel.org/stable/c/4a6673c55752a7aa41e28f51660eb981504ca088"
},
{
"url": "https://git.kernel.org/stable/c/ab2bac47a02637df1128a151e81d3ec14767f4bb"
},
{
"url": "https://git.kernel.org/stable/c/dc16bbf53cede1baf564bf0c8a861114b64e18b3"
},
{
"url": "https://git.kernel.org/stable/c/e5e18886aadd3870e2d84e32a9678317fab1dd9e"
},
{
"url": "https://git.kernel.org/stable/c/f4fb97ecf677cd9c3aa4f3bfc6fbf5b0e4bdbbbf"
},
{
"url": "https://git.kernel.org/stable/c/cdf3b5af2bc4431e58629e8ad2086b1e9185c761"
}
],
"title": "batman-adv: bla: reacquire gw address after skb realloc",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-72233",
"datePublished": "2026-08-15T05:54:23.663Z",
"dateReserved": "2026-08-09T03:40:39.913Z",
"dateUpdated": "2026-08-17T05:41:50.777Z",
"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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