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vuln-cve/data/2026/80xxx/CVE-2026-80731.json
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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2026-80731",
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"state": "PUBLISHED",
"assignerShortName": "Linux",
"dateReserved": "2026-08-26T14:34:25.789Z",
"datePublished": "2026-09-03T08:21:48.924Z",
"dateUpdated": "2026-10-16T19:26:36.020Z"
},
"containers": {
"cna": {
"providerMetadata": {
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux",
"dateUpdated": "2026-09-04T04:58:17.510Z"
},
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: remove CAP_SYS_RAWIO zero-padding in dev_validate_header\n\ndev_validate_header() reads dev->hard_header_len directly when\nzero-padding short link layer headers for CAP_SYS_RAWIO holders:\n\n if (capable(CAP_SYS_RAWIO)) {\n memset(ll_header + len, 0, dev->hard_header_len - len);\n return true;\n }\n\nPacket send paths call dev_validate_header() on skbs whose headroom was\nallocated from an earlier hard_header_len read. If the device is\nreconfigured so that dev->hard_header_len increases before validation,\nthe memset writes past the reserved buffer, an out-of-bounds write.\n\nThis out-of-bounds write is masked in some SOCK_RAW paths today because\nthe same concurrent increase can first make skb_push() exceed the\nreserved headroom and trigger skb_under_panic(). Remove the zero-padding\nbranch before making those hard_header_len reads consistent, so the\nsnapshot fixes do not turn a loud panic into a silent overwrite.\n\nThis path is only reached for variable length L2 protocols, where\nlen < hard_header_len but len >= min_header_len. No remaining in-tree\nvariable length L2 protocol implements header_ops->validate, and the\nCAP_SYS_RAWIO bypass that zero-pads and accepts short headers has no\nreal value beyond allowing testing of intentionally malformed input.\n\nDrop the CAP_SYS_RAWIO branch. The remaining reads of\ndev->hard_header_len in dev_validate_header() are comparisons only and\nhave no memory safety impact."
}
],
"metrics": [
{
"cvssV3_1": {
"version": "3.1",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"baseScore": 7.8,
"baseSeverity": "HIGH"
},
"scenarios": [
{
"lang": "en",
"value": "AV:L - Exploitation requires a local sendmsg() on a PF_PACKET SOCK_RAW socket; dev_validate_header() is only reached from af_packet transmit paths (packet_snd, packet_sendmsg_spkt, tpacket_fill_skb), not from remote packet receive.\nAC:L - The attacker can reliably win the TOCTOU race by concurrently sending PF_PACKET frames while changing netdev hard_header_len (e.g., PPP channel attach or bonding slave updates via rtnetlink), controlling both allocation and validation sides.\nPR:L - PF_PACKET creation requires CAP_NET_RAW and the memset bypass requires CAP_SYS_RAWIO; both are granted to user-namespace root (CAP_FULL_SET via unshare -Urn), so a basic unprivileged local user can obtain the needed privileges without init-namespace root.\nUI:N - No victim interaction is required; exploitation is fully attacker-driven through socket creation, concurrent device reconfiguration, and crafted sendmsg() calls.\nS:U - Impact is kernel heap memory corruption and local privilege escalation within the same kernel security domain, not a VM escape, IOMMU bypass, or other cross-authority boundary violation.\nC:H - The bug is an out-of-bounds write via memset() past skb link-layer headroom when hard_header_len grows between allocation and validation; such heap corruption can be groomed into arbitrary kernel memory read primitives.\nI:H - Writing past the reserved skb headroom corrupts adjacent kernel heap objects and is a standard exploitable primitive for arbitrary kernel writes, control-flow hijacking, and privilege escalation.\nA:H - The out-of-bounds memset can corrupt critical kernel structures and trigger oops/panic; the commit notes this can silently overwrite memory where other SOCK_RAW paths would have panicked via skb_under_panic."
}
]
}
],
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"defaultStatus": "affected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
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],
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{
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{
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"versionType": "original_commit_for_fix"
}
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"url": "https://git.kernel.org/stable/c/fa6d98dd925e72fc028b26a0cbbff9d2f0601ff6"
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"title": "net: remove CAP_SYS_RAWIO zero-padding in dev_validate_header",
"x_generator": {
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}
},
"adp": [
{
"metrics": [
{
"other": {
"type": "ssvc",
"content": {
"id": "CVE-2026-80731",
"role": "CISA Coordinator",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "total"
}
],
"version": "2.0.3",
"timestamp": "2026-10-16T19:21:14.341917Z"
}
}
}
],
"title": "CISA ADP Vulnrichment",
"providerMetadata": {
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP",
"dateUpdated": "2026-10-16T19:26:36.020Z"
}
}
]
}
}
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