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vuln-cve/data/2026/81xxx/CVE-2026-81002.json
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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2026-81002",
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"state": "PUBLISHED",
"assignerShortName": "Linux",
"dateReserved": "2026-08-26T14:34:25.812Z",
"datePublished": "2026-09-11T19:42:55.506Z",
"dateUpdated": "2026-10-19T08:46:26.611Z"
},
"containers": {
"cna": {
"providerMetadata": {
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux",
"dateUpdated": "2026-10-19T08:46:26.611Z"
},
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nxdp: fix zero-copy frame layout\n\nxdp_convert_zc_to_xdp_frame() clones an XSK packet into an order-0 page\nand advertises PAGE_SIZE as its frame size. It allows the copied frame\nto occupy the page tail needed by skb_shared_info and records zero\nheadroom even when metadata separates the frame header from packet data.\nAn AF_XDP zero-copy packet redirected through cpumap can therefore make\nthe skb overlap skb_shared_info or place it beyond the allocated page.\n\nLimit the copied layout to SKB_WITH_OVERHEAD(PAGE_SIZE) and include the\nmetadata length in frame headroom. Redirect callers already handle a\nNULL conversion result.\n\nBUG: KASAN: slab-out-of-bounds in skb_gro_receive\nWrite of size 4 at addr ffff88800cf37004 by task cpumap/1/map:1/146\nCall Trace:\n skb_gro_receive (net/core/gro.c:174)\n udp_gro_receive (net/ipv4/udp_offload.c:812)\n inet_gro_receive (net/ipv4/af_inet.c:1539)\n dev_gro_receive (net/core/gro.c:515)\n gro_receive_skb (net/core/gro.c:633)\n cpu_map_kthread_run (kernel/bpf/cpumap.c:395)\n kthread (kernel/kthread.c:436)\n ret_from_fork (arch/x86/kernel/process.c:164)\n ret_from_fork_asm (arch/x86/entry/entry_64.S:255)\nKernel panic - not syncing: KASAN: panic_on_warn set ..."
}
],
"metrics": [
{
"cvssV3_1": {
"version": "3.1",
"vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
"baseScore": 9.8,
"baseSeverity": "CRITICAL"
},
"scenarios": [
{
"lang": "en",
"value": "AV:N - Received AF_XDP zero-copy packets reach xdp_convert_zc_to_xdp_frame() on XDP_REDIRECT into cpumap or a veth. On an internet-facing NIC with that hybrid XDP/AF_XDP setup, unauthenticated remote frames drive the cloned page into skb/GRO; AF_XDP bind is a victim-side prerequisite, not a local-only syscall bug.\nAC:L - The sender chooses packet length, so a 4K UMEM/jumbo frame makes the clone occupy the skb_shared_info tail, and normal cpumap/veth metadata (bpf_xdp_adjust_meta) misplaces sinfo past the page. Either layout is attacker-reproducible with no race or uninfluenced memory-layout dependency.\nPR:N - The remote sender needs no account or capability. CAP_NET_RAW, CAP_NET_ADMIN, and CAP_BPF are required only by the victim process that binds the XSK queue and loads the XDP redirect program, matching other AF_XDP RX-path kernel scores.\nUI:N - After the interface is configured, inbound packets are converted and passed to GRO automatically in NAPI or the cpumap kthread; no victim mount, click, or other per-packet action is required.\nS:U - The out-of-bounds skb_shared_info write corrupts host kernel heap/page memory in the same kernel authority. It is ordinary kernel memory corruption, not a VM, IOMMU, or sandbox boundary crossing.\nC:H - skb_shared_info is placed past the order-0 page or overlapped with the copied frame, so GRO and build_skb write into adjacent objects that hold kernel pointers; that corruption can be turned into an arbitrary kernel read, so confidentiality is High.\nI:H - KASAN records a 4-byte out-of-bounds write in skb_gro_receive while building the skb around the mis-sized ZC clone. An OOB write of skb_shared_info (including pointer fields) is an arbitrary-write/control-flow primitive, so integrity is High.\nA:H - The same GRO path panics under KASAN and oopses without it when skb_shared_info is written off the allocated page, so a remote packet can crash the kernel."
}
]
}
],
"affected": [
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "unaffected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"net/core/xdp.c"
],
"versions": [
{
"version": "b0d1beeff2a97a0cf1965ea8f1d13b8973f22582",
"lessThan": "dcb6db9ca6515fcd3e00c93ec5e27dc7a0a7012f",
"status": "affected",
"versionType": "git"
},
{
"version": "b0d1beeff2a97a0cf1965ea8f1d13b8973f22582",
"lessThan": "22092730129077c302d8c947bbe0876f0280c528",
"status": "affected",
"versionType": "git"
},
{
"version": "b0d1beeff2a97a0cf1965ea8f1d13b8973f22582",
"lessThan": "ced3e18cd9b9caf630aaa1e1eac305f5192ba896",
"status": "affected",
"versionType": "git"
},
{
"version": "b0d1beeff2a97a0cf1965ea8f1d13b8973f22582",
"lessThan": "6de17275b3ccdf9887568b07e54da2e3597217cf",
"status": "affected",
"versionType": "git"
},
{
"version": "b0d1beeff2a97a0cf1965ea8f1d13b8973f22582",
"lessThan": "444216dacdbebd3e52d5e704facafbb230da09e9",
"status": "affected",
"versionType": "git"
},
{
"version": "b0d1beeff2a97a0cf1965ea8f1d13b8973f22582",
"lessThan": "15d1f3c0dbe7a740f779337deb39f23cd8d002c8",
"status": "affected",
"versionType": "git"
},
{
"version": "b0d1beeff2a97a0cf1965ea8f1d13b8973f22582",
"lessThan": "68d7cc5512238693670fc19c7a615df631e10edf",
"status": "affected",
"versionType": "git"
},
{
"version": "b0d1beeff2a97a0cf1965ea8f1d13b8973f22582",
"lessThan": "71283aaa6c65b3cec84caf1dc78560985737641f",
"status": "affected",
"versionType": "git"
}
]
},
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "affected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"net/core/xdp.c"
],
"versions": [
{
"version": "4.20",
"status": "affected"
},
{
"version": "0",
"lessThan": "4.20",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "5.10.270",
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "5.15.221",
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.1.188",
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.6.157",
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.12.109",
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "6.18.50",
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "7.2.4",
"lessThanOrEqual": "7.2.*",
"status": "unaffected",
"versionType": "semver"
},
{
"version": "7.3",
"lessThanOrEqual": "*",
"status": "unaffected",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"operator": "OR",
"negate": false,
"cpeMatch": [
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.20",
"versionEndExcluding": "5.10.270"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.20",
"versionEndExcluding": "5.15.221"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.20",
"versionEndExcluding": "6.1.188"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.20",
"versionEndExcluding": "6.6.157"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.20",
"versionEndExcluding": "6.12.109"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.20",
"versionEndExcluding": "6.18.50"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.20",
"versionEndExcluding": "7.2.4"
},
{
"vulnerable": true,
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionStartIncluding": "4.20",
"versionEndExcluding": "7.3"
}
]
}
]
}
],
"references": [
{
"url": "https://git.kernel.org/stable/c/dcb6db9ca6515fcd3e00c93ec5e27dc7a0a7012f"
},
{
"url": "https://git.kernel.org/stable/c/22092730129077c302d8c947bbe0876f0280c528"
},
{
"url": "https://git.kernel.org/stable/c/ced3e18cd9b9caf630aaa1e1eac305f5192ba896"
},
{
"url": "https://git.kernel.org/stable/c/6de17275b3ccdf9887568b07e54da2e3597217cf"
},
{
"url": "https://git.kernel.org/stable/c/444216dacdbebd3e52d5e704facafbb230da09e9"
},
{
"url": "https://git.kernel.org/stable/c/15d1f3c0dbe7a740f779337deb39f23cd8d002c8"
},
{
"url": "https://git.kernel.org/stable/c/68d7cc5512238693670fc19c7a615df631e10edf"
},
{
"url": "https://git.kernel.org/stable/c/71283aaa6c65b3cec84caf1dc78560985737641f"
}
],
"title": "xdp: fix zero-copy frame layout",
"x_generator": {
"engine": "bippy-1.2.0"
}
},
"adp": [
{
"metrics": [
{
"other": {
"type": "ssvc",
"content": {
"id": "CVE-2026-81002",
"role": "CISA Coordinator",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "yes"
},
{
"Technical Impact": "total"
}
],
"version": "2.0.3",
"timestamp": "2026-10-16T19:22:09.618662Z"
}
}
}
],
"title": "CISA ADP Vulnrichment",
"providerMetadata": {
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP",
"dateUpdated": "2026-10-16T19:26:38.483Z"
}
}
]
}
}
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