{ "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" } } ] } }