235 lines
14 KiB
JSON
235 lines
14 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-80725",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2026-08-26T14:34:25.789Z",
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"datePublished": "2026-08-29T06:39:35.212Z",
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"dateUpdated": "2026-10-16T19:26:35.734Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-09-04T04:58:15.396Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"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->mac_header). Because skb_headroom(p) includes\n mac_len, crafted frames (e.g. injected via AF_PACKET) can pass the check\n with p->mac_header < 8 bytes. When ipv6_gro_complete() inserts the\n temporary HBH jumbo header, the memmove() starts before skb->head,\n causing an out-of-bounds write and wrapping skb->mac_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->protocol != ETH_P_IPV6 was true.\n3. It checked p->encapsulation instead of NAPI_GRO_CB(skb)->encap_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)->proto == IPPROTO_TCP\n- Not encapsulated (!NAPI_GRO_CB(skb)->encap_mark && !p->encapsulation)\n- Protocol must be either ETH_P_IP or ETH_P_IPV6\n- If ETH_P_IPV6, p->mac_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 <= 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."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 9.8,
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"baseSeverity": "CRITICAL"
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},
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"scenarios": [
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{
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"lang": "en",
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"value": "AV:N - The flaw is in skb_gro_receive() on the netdev NAPI GRO ingress path (netif_receive_skb→napi_gro_receive→dev_gro_receive→tcp/ipv6 gro handlers); remote peers can deliver crafted in-flow TCP streams to internet-facing interfaces without local access.\nAC:L - On Big TCP deployments with gro_max_size>64KB, an attacker reliably coalesces past GRO_LEGACY_MAX_SIZE by sending many same-flow TCP segments; AF_PACKET injection also gives deterministic header layout control without races or victim-dependent heap layout.\nPR:N - RX GRO runs in softirq on all received packets before socket authentication; no target credentials or capabilities are required. Elevated gro_max_size is an admin tuning prerequisite of the Big TCP server class, not an attacker privilege.\nUI:N - Packet reception and GRO aggregation are automatic kernel network-stack processing triggered solely by attacker-sent traffic; no victim mount, file open, or other interaction is required.\nS:U - Impact is kernel skb/heap memory corruption within the host kernel security authority; exploitation does not cross VM, container, or IOMMU boundaries that would warrant scope-changed scoring.\nC:H - When undersized mac_header room passes the broken skb_headroom check, ipv6_gro_complete() memmove() for the temporary HBH jumbo header writes before skb->head, corrupting adjacent kernel memory and enabling information disclosure from attacker-influenced out-of-bounds writes.\nI:H - The same invalid BIG TCP aggregation drives attacker-controlled memmove/header corruption that wraps skb->mac_header, yielding an out-of-bounds write primitive suitable for heap object corruption, control-flow hijacking, and local privilege escalation.\nA:H - The defective memmove or invalid >64KB aggregation on disallowed VLAN, encapsulated, or malformed flows can oops or panic the kernel during GRO completion, and a remote attacker can trigger this repeatedly to deny service."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"net/core/gro.c"
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],
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"versions": [
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{
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"version": "0fe79f28bfaf73b66b7b1562d2468f94aa03bd12",
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"lessThan": "37a5dcd6837fc2afc44a7bc3ed8af4e983783d46",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "0fe79f28bfaf73b66b7b1562d2468f94aa03bd12",
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"lessThan": "e907bf694ed55bdfe421be99dba35751a655df25",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "0fe79f28bfaf73b66b7b1562d2468f94aa03bd12",
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"lessThan": "03cb8cc2961f5f781d12e903782cb3815ed84b1c",
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"status": "affected",
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{
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"status": "affected",
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{
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"lessThan": "81be30c1f5f2bffda1f04c0efd0746af10b9643a",
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"status": "affected",
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"versionType": "git"
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"net/core/gro.c"
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],
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"versions": [
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{
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"version": "5.19",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "5.19",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.1.185",
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"lessThanOrEqual": "6.1.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.6.154",
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"lessThanOrEqual": "6.6.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.12.106",
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"lessThanOrEqual": "6.12.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.18.47",
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"lessThanOrEqual": "6.18.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.0",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"cpeApplicability": [
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{
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"nodes": [
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "5.19",
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"versionEndExcluding": "6.1.185"
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/37a5dcd6837fc2afc44a7bc3ed8af4e983783d46"
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},
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"url": "https://git.kernel.org/stable/c/e907bf694ed55bdfe421be99dba35751a655df25"
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},
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{
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"url": "https://git.kernel.org/stable/c/03cb8cc2961f5f781d12e903782cb3815ed84b1c"
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{
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"url": "https://git.kernel.org/stable/c/3ce832e2bd431d0c12ba525ed73ad8fbc4191da5"
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"url": "https://git.kernel.org/stable/c/81be30c1f5f2bffda1f04c0efd0746af10b9643a"
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}
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],
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"title": "net: gro: properly validate BIG TCP aggregation criteria",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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},
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{
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"metrics": [
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{
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"other": {
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"type": "ssvc",
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"content": {
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"id": "CVE-2026-80725",
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"role": "CISA Coordinator",
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"options": [
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{
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"Exploitation": "none"
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},
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{
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"Automatable": "yes"
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},
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{
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"Technical Impact": "total"
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}
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],
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"version": "2.0.3",
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"timestamp": "2026-10-16T19:21:06.422941Z"
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}
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}
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}
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],
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"title": "CISA ADP Vulnrichment",
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"providerMetadata": {
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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"shortName": "CISA-ADP",
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"dateUpdated": "2026-10-16T19:26:35.734Z"
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}
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}
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]
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}
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} |