CVE-2026-52916 (GCVE-0-2026-52916)
Vulnerability from cvelistv5 – Published: 2026-06-24 07:14 – Updated: 2026-06-24 07:14
VLAI?
Title
batman-adv: frag: disallow unicast fragment in fragment
Summary
In the Linux kernel, the following vulnerability has been resolved:
batman-adv: frag: disallow unicast fragment in fragment
batadv_frag_skb_buffer() is called by batadv_batman_skb_recv() when a
BATADV_UNICAST_FRAG packet is received. Once all fragments are collected
and the packet is reassembled, batadv_recv_frag_packet() calls
batadv_batman_skb_recv() again to process the defragmented payload.
A malicious sender can craft a BATADV_UNICAST_FRAG packet whose reassembled
payload is itself a BATADV_UNICAST_FRAG packet (matryoshka-style nesting).
Each nesting level recurses through batadv_batman_skb_recv() without bound,
growing the kernel stack until it is exhausted.
Since refragmentation or fragments in fragments are not actually allowed,
discard all packets which are still BATADV_UNICAST_FRAG packets after the
defragmentation process.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
| Vendor | Product | Version | |||||||
|---|---|---|---|---|---|---|---|---|---|
| Linux | Linux |
Affected:
610bfc6bc99bc83680d190ebc69359a05fc7f605 , < 0c208fa3859e3a33a1c38bebc41d021166e94ac8
(git)
Affected: 610bfc6bc99bc83680d190ebc69359a05fc7f605 , < bcda4814dc6524283c0b958882cb963d75fe411d (git) Affected: 610bfc6bc99bc83680d190ebc69359a05fc7f605 , < aea54d0bbe156d5ab7d00d68f66149ff41f4612a (git) Affected: 610bfc6bc99bc83680d190ebc69359a05fc7f605 , < b54e459cf86943583c1aa2ee3081874e7ab1f5f3 (git) Affected: 610bfc6bc99bc83680d190ebc69359a05fc7f605 , < 5418be6c2e117bf8a316582795a8e3ff90f45e5d (git) Affected: 610bfc6bc99bc83680d190ebc69359a05fc7f605 , < 5895ad21c7059a652da83fb817510f7a1e962abf (git) Affected: 610bfc6bc99bc83680d190ebc69359a05fc7f605 , < 7138c35c9ad39a2fca6264af6b87466471f04ffc (git) Affected: 610bfc6bc99bc83680d190ebc69359a05fc7f605 , < bc62216dc8e221e3781afa14430f45208bfa9af9 (git) |
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{
"containers": {
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{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
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],
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],
"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": "5.10.258",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.209",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.175",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.142",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.92",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.34",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.0.*",
"status": "unaffected",
"version": "7.0.11",
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},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.1",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
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"nodes": [
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}
],
"negate": false,
"operator": "OR"
}
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],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbatman-adv: frag: disallow unicast fragment in fragment\n\nbatadv_frag_skb_buffer() is called by batadv_batman_skb_recv() when a\nBATADV_UNICAST_FRAG packet is received. Once all fragments are collected\nand the packet is reassembled, batadv_recv_frag_packet() calls\nbatadv_batman_skb_recv() again to process the defragmented payload.\n\nA malicious sender can craft a BATADV_UNICAST_FRAG packet whose reassembled\npayload is itself a BATADV_UNICAST_FRAG packet (matryoshka-style nesting).\nEach nesting level recurses through batadv_batman_skb_recv() without bound,\ngrowing the kernel stack until it is exhausted.\n\nSince refragmentation or fragments in fragments are not actually allowed,\ndiscard all packets which are still BATADV_UNICAST_FRAG packets after the\ndefragmentation process."
}
],
"providerMetadata": {
"dateUpdated": "2026-06-24T07:14:13.221Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/0c208fa3859e3a33a1c38bebc41d021166e94ac8"
},
{
"url": "https://git.kernel.org/stable/c/bcda4814dc6524283c0b958882cb963d75fe411d"
},
{
"url": "https://git.kernel.org/stable/c/aea54d0bbe156d5ab7d00d68f66149ff41f4612a"
},
{
"url": "https://git.kernel.org/stable/c/b54e459cf86943583c1aa2ee3081874e7ab1f5f3"
},
{
"url": "https://git.kernel.org/stable/c/5418be6c2e117bf8a316582795a8e3ff90f45e5d"
},
{
"url": "https://git.kernel.org/stable/c/5895ad21c7059a652da83fb817510f7a1e962abf"
},
{
"url": "https://git.kernel.org/stable/c/7138c35c9ad39a2fca6264af6b87466471f04ffc"
},
{
"url": "https://git.kernel.org/stable/c/bc62216dc8e221e3781afa14430f45208bfa9af9"
}
],
"title": "batman-adv: frag: disallow unicast fragment in fragment",
"x_generator": {
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}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-52916",
"datePublished": "2026-06-24T07:14:13.221Z",
"dateReserved": "2026-06-09T07:44:35.367Z",
"dateUpdated": "2026-06-24T07:14:13.221Z",
"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 observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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