CVE-2026-80725 (GCVE-0-2026-80725)
Vulnerability from cvelistv5 – Published: 2026-08-29 06:39 – Updated: 2026-08-29 06:40
VLAI
EPSS
VEX
Title
net: gro: properly validate BIG TCP aggregation criteria
Summary
In the Linux kernel, the following vulnerability has been resolved:
net: gro: properly validate BIG TCP aggregation criteria
When GRO attempts to aggregate packets beyond GRO_LEGACY_MAX_SIZE (64KB),
BIG TCP should only be permitted for plain IPv4 TCP and plain IPv6 TCP
(with sufficient MAC header room to insert the temporary HBH jumbo header).
However, commit b1a78b9b9886 ("net: add support for ipv4 big tcp")
loosened the check in skb_gro_receive(), leading to several issues:
1. skb_gro_receive() checked skb_headroom(p) instead of the actual space
before the MAC header (p->mac_header). Because skb_headroom(p) includes
mac_len, crafted frames (e.g. injected via AF_PACKET) can pass the check
with p->mac_header < 8 bytes. When ipv6_gro_complete() inserts the
temporary HBH jumbo header, the memmove() starts before skb->head,
causing an out-of-bounds write and wrapping skb->mac_header.
2. It allowed non-IP protocols such as software VLAN (ETH_P_8021Q /
ETH_P_8021AD) to aggregate beyond 64KB because
p->protocol != ETH_P_IPV6 was true.
3. It checked p->encapsulation instead of NAPI_GRO_CB(skb)->encap_mark,
allowing encapsulated flows (e.g. SIT / IPv6-in-IPv4) to aggregate
beyond 64KB.
Fix skb_gro_receive() to strictly enforce:
- NAPI_GRO_CB(skb)->proto == IPPROTO_TCP
- Not encapsulated (!NAPI_GRO_CB(skb)->encap_mark && !p->encapsulation)
- Protocol must be either ETH_P_IP or ETH_P_IPV6
- If ETH_P_IPV6, p->mac_header must be at least
sizeof(struct hop_jumbo_hdr)
Returning -E2BIG from skb_gro_receive() ensures that packets which cannot
become BIG TCP are cleanly flushed at <= 64KB and delivered intact without
dropping.
This issue does not exist in mainline (7.0+) because the subsystem was
rewritten in commit 81be30c1f5f2 ("net/ipv6: Drop HBH for BIG TCP on RX
side"), making this fix relevant only for older stable branches like
6.18.y.
Severity
No CVSS data available.
Assigner
References
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
0fe79f28bfaf73b66b7b1562d2468f94aa03bd12 , < 37a5dcd6837fc2afc44a7bc3ed8af4e983783d46
(git)
Affected: 0fe79f28bfaf73b66b7b1562d2468f94aa03bd12 , < e907bf694ed55bdfe421be99dba35751a655df25 (git) Affected: 0fe79f28bfaf73b66b7b1562d2468f94aa03bd12 , < 03cb8cc2961f5f781d12e903782cb3815ed84b1c (git) Affected: 0fe79f28bfaf73b66b7b1562d2468f94aa03bd12 , < 3ce832e2bd431d0c12ba525ed73ad8fbc4191da5 (git) Affected: 0fe79f28bfaf73b66b7b1562d2468f94aa03bd12 , < 81be30c1f5f2bffda1f04c0efd0746af10b9643a (git) |
guessed | |
| Linux | Linux |
Affected:
5.19
Unaffected: 0 , < 5.19 (semver) Unaffected: 6.1.185 , ≤ 6.1.* (semver) Unaffected: 6.6.154 , ≤ 6.6.* (semver) Unaffected: 6.12.106 , ≤ 6.12.* (semver) Unaffected: 6.18.47 , ≤ 6.18.* (semver) Unaffected: 7.0 , ≤ * (original_commit_for_fix) |
guessed |
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"net/core/gro.c"
],
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"vendor": "Linux",
"versions": [
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"versionType": "git"
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{
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"status": "affected",
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"versionType": "git"
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{
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"status": "affected",
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"versionType": "git"
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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": "5.19"
},
{
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"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
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"status": "unaffected",
"version": "6.1.185",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.154",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.106",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.47",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.0",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.1.185",
"versionStartIncluding": "5.19",
"vulnerable": true
},
{
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},
{
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},
{
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},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.0",
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"vulnerable": true
}
],
"negate": false,
"operator": "OR"
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"descriptions": [
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"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: gro: properly validate BIG TCP aggregation criteria\n\nWhen GRO attempts to aggregate packets beyond GRO_LEGACY_MAX_SIZE (64KB),\nBIG TCP should only be permitted for plain IPv4 TCP and plain IPv6 TCP\n(with sufficient MAC header room to insert the temporary HBH jumbo header).\n\nHowever, commit b1a78b9b9886 (\"net: add support for ipv4 big tcp\")\nloosened the check in skb_gro_receive(), leading to several issues:\n\n1. skb_gro_receive() checked skb_headroom(p) instead of the actual space\n before the MAC header (p-\u003emac_header). Because skb_headroom(p) includes\n mac_len, crafted frames (e.g. injected via AF_PACKET) can pass the check\n with p-\u003emac_header \u003c 8 bytes. When ipv6_gro_complete() inserts the\n temporary HBH jumbo header, the memmove() starts before skb-\u003ehead,\n causing an out-of-bounds write and wrapping skb-\u003emac_header.\n2. It allowed non-IP protocols such as software VLAN (ETH_P_8021Q /\n ETH_P_8021AD) to aggregate beyond 64KB because\n p-\u003eprotocol != ETH_P_IPV6 was true.\n3. It checked p-\u003eencapsulation instead of NAPI_GRO_CB(skb)-\u003eencap_mark,\n allowing encapsulated flows (e.g. SIT / IPv6-in-IPv4) to aggregate\n beyond 64KB.\n\nFix skb_gro_receive() to strictly enforce:\n- NAPI_GRO_CB(skb)-\u003eproto == IPPROTO_TCP\n- Not encapsulated (!NAPI_GRO_CB(skb)-\u003eencap_mark \u0026\u0026 !p-\u003eencapsulation)\n- Protocol must be either ETH_P_IP or ETH_P_IPV6\n- If ETH_P_IPV6, p-\u003emac_header must be at least\n sizeof(struct hop_jumbo_hdr)\n\nReturning -E2BIG from skb_gro_receive() ensures that packets which cannot\nbecome BIG TCP are cleanly flushed at \u003c= 64KB and delivered intact without\ndropping.\n\nThis issue does not exist in mainline (7.0+) because the subsystem was\nrewritten in commit 81be30c1f5f2 (\"net/ipv6: Drop HBH for BIG TCP on RX\nside\"), making this fix relevant only for older stable branches like\n6.18.y."
}
],
"providerMetadata": {
"dateUpdated": "2026-08-29T06:40:30.300Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/37a5dcd6837fc2afc44a7bc3ed8af4e983783d46"
},
{
"url": "https://git.kernel.org/stable/c/e907bf694ed55bdfe421be99dba35751a655df25"
},
{
"url": "https://git.kernel.org/stable/c/03cb8cc2961f5f781d12e903782cb3815ed84b1c"
},
{
"url": "https://git.kernel.org/stable/c/3ce832e2bd431d0c12ba525ed73ad8fbc4191da5"
},
{
"url": "https://git.kernel.org/stable/c/81be30c1f5f2bffda1f04c0efd0746af10b9643a"
}
],
"title": "net: gro: properly validate BIG TCP aggregation criteria",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-80725",
"datePublished": "2026-08-29T06:39:35.212Z",
"dateReserved": "2026-08-26T14:34:25.789Z",
"dateUpdated": "2026-08-29T06:40:30.300Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"vulnerability-lookup:meta": {
"nvd": "{\"cve\":{\"id\":\"CVE-2026-80725\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-08-29T07:16:54.573\",\"lastModified\":\"2026-08-29T07:16:54.573\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnet: gro: properly validate BIG TCP aggregation criteria\\n\\nWhen GRO attempts to aggregate packets beyond GRO_LEGACY_MAX_SIZE (64KB),\\nBIG TCP should only be permitted for plain IPv4 TCP and plain IPv6 TCP\\n(with sufficient MAC header room to insert the temporary HBH jumbo header).\\n\\nHowever, commit b1a78b9b9886 (\\\"net: add support for ipv4 big tcp\\\")\\nloosened the check in skb_gro_receive(), leading to several issues:\\n\\n1. skb_gro_receive() checked skb_headroom(p) instead of the actual space\\n before the MAC header (p-\u003emac_header). Because skb_headroom(p) includes\\n mac_len, crafted frames (e.g. injected via AF_PACKET) can pass the check\\n with p-\u003emac_header \u003c 8 bytes. When ipv6_gro_complete() inserts the\\n temporary HBH jumbo header, the memmove() starts before skb-\u003ehead,\\n causing an out-of-bounds write and wrapping skb-\u003emac_header.\\n2. It allowed non-IP protocols such as software VLAN (ETH_P_8021Q /\\n ETH_P_8021AD) to aggregate beyond 64KB because\\n p-\u003eprotocol != ETH_P_IPV6 was true.\\n3. It checked p-\u003eencapsulation instead of NAPI_GRO_CB(skb)-\u003eencap_mark,\\n allowing encapsulated flows (e.g. SIT / IPv6-in-IPv4) to aggregate\\n beyond 64KB.\\n\\nFix skb_gro_receive() to strictly enforce:\\n- NAPI_GRO_CB(skb)-\u003eproto == IPPROTO_TCP\\n- Not encapsulated (!NAPI_GRO_CB(skb)-\u003eencap_mark \u0026\u0026 !p-\u003eencapsulation)\\n- Protocol must be either ETH_P_IP or ETH_P_IPV6\\n- If ETH_P_IPV6, p-\u003emac_header must be at least\\n sizeof(struct hop_jumbo_hdr)\\n\\nReturning -E2BIG from skb_gro_receive() ensures that packets which cannot\\nbecome BIG TCP are cleanly flushed at \u003c= 64KB and delivered intact without\\ndropping.\\n\\nThis issue does not exist in mainline (7.0+) because the subsystem was\\nrewritten in commit 81be30c1f5f2 (\\\"net/ipv6: Drop HBH for BIG TCP on RX\\nside\\\"), making this fix relevant only for older stable branches like\\n6.18.y.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/core/gro.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"0fe79f28bfaf73b66b7b1562d2468f94aa03bd12\",\"lessThan\":\"37a5dcd6837fc2afc44a7bc3ed8af4e983783d46\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"0fe79f28bfaf73b66b7b1562d2468f94aa03bd12\",\"lessThan\":\"e907bf694ed55bdfe421be99dba35751a655df25\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"0fe79f28bfaf73b66b7b1562d2468f94aa03bd12\",\"lessThan\":\"03cb8cc2961f5f781d12e903782cb3815ed84b1c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"0fe79f28bfaf73b66b7b1562d2468f94aa03bd12\",\"lessThan\":\"3ce832e2bd431d0c12ba525ed73ad8fbc4191da5\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"0fe79f28bfaf73b66b7b1562d2468f94aa03bd12\",\"lessThan\":\"81be30c1f5f2bffda1f04c0efd0746af10b9643a\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/core/gro.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.19\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.19\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.185\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.154\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.106\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.47\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/03cb8cc2961f5f781d12e903782cb3815ed84b1c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/37a5dcd6837fc2afc44a7bc3ed8af4e983783d46\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/3ce832e2bd431d0c12ba525ed73ad8fbc4191da5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/81be30c1f5f2bffda1f04c0efd0746af10b9643a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e907bf694ed55bdfe421be99dba35751a655df25\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
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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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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