CVE-2026-81002 (GCVE-0-2026-81002)
Vulnerability from cvelistv5
Published
2026-09-11 19:42
Modified
2026-10-19 08:46
Severity ?
9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: xdp: fix zero-copy frame layout xdp_convert_zc_to_xdp_frame() clones an XSK packet into an order-0 page and advertises PAGE_SIZE as its frame size. It allows the copied frame to occupy the page tail needed by skb_shared_info and records zero headroom even when metadata separates the frame header from packet data. An AF_XDP zero-copy packet redirected through cpumap can therefore make the skb overlap skb_shared_info or place it beyond the allocated page. Limit the copied layout to SKB_WITH_OVERHEAD(PAGE_SIZE) and include the metadata length in frame headroom. Redirect callers already handle a NULL conversion result. BUG: KASAN: slab-out-of-bounds in skb_gro_receive Write of size 4 at addr ffff88800cf37004 by task cpumap/1/map:1/146 Call Trace: skb_gro_receive (net/core/gro.c:174) udp_gro_receive (net/ipv4/udp_offload.c:812) inet_gro_receive (net/ipv4/af_inet.c:1539) dev_gro_receive (net/core/gro.c:515) gro_receive_skb (net/core/gro.c:633) cpu_map_kthread_run (kernel/bpf/cpumap.c:395) kthread (kernel/kthread.c:436) ret_from_fork (arch/x86/kernel/process.c:164) ret_from_fork_asm (arch/x86/entry/entry_64.S:255) Kernel panic - not syncing: KASAN: panic_on_warn set ...
References
Impacted products
Vendor Product Version
Linux Linux Version: b0d1beeff2a97a0cf1965ea8f1d13b8973f22582
Version: b0d1beeff2a97a0cf1965ea8f1d13b8973f22582
Version: b0d1beeff2a97a0cf1965ea8f1d13b8973f22582
Version: b0d1beeff2a97a0cf1965ea8f1d13b8973f22582
Version: b0d1beeff2a97a0cf1965ea8f1d13b8973f22582
Version: b0d1beeff2a97a0cf1965ea8f1d13b8973f22582
Version: b0d1beeff2a97a0cf1965ea8f1d13b8973f22582
Version: b0d1beeff2a97a0cf1965ea8f1d13b8973f22582
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    "dateUpdated": "2026-10-19T08:46:26.611Z",
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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. 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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\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"b0d1beeff2a97a0cf1965ea8f1d13b8973f22582\", \"lessThan\": \"dcb6db9ca6515fcd3e00c93ec5e27dc7a0a7012f\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"b0d1beeff2a97a0cf1965ea8f1d13b8973f22582\", \"lessThan\": \"22092730129077c302d8c947bbe0876f0280c528\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"b0d1beeff2a97a0cf1965ea8f1d13b8973f22582\", \"lessThan\": \"ced3e18cd9b9caf630aaa1e1eac305f5192ba896\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"b0d1beeff2a97a0cf1965ea8f1d13b8973f22582\", \"lessThan\": \"6de17275b3ccdf9887568b07e54da2e3597217cf\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"b0d1beeff2a97a0cf1965ea8f1d13b8973f22582\", \"lessThan\": \"444216dacdbebd3e52d5e704facafbb230da09e9\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"b0d1beeff2a97a0cf1965ea8f1d13b8973f22582\", \"lessThan\": \"15d1f3c0dbe7a740f779337deb39f23cd8d002c8\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"b0d1beeff2a97a0cf1965ea8f1d13b8973f22582\", \"lessThan\": \"68d7cc5512238693670fc19c7a615df631e10edf\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"b0d1beeff2a97a0cf1965ea8f1d13b8973f22582\", \"lessThan\": \"71283aaa6c65b3cec84caf1dc78560985737641f\", \"versionType\": \"git\"}], \"programFiles\": [\"net/core/xdp.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"4.20\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"4.20\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.10.270\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.221\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.188\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.157\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12.109\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.12.*\"}, {\"status\": \"unaffected\", \"version\": \"6.18.50\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.18.*\"}, {\"status\": \"unaffected\", \"version\": \"7.2.4\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"7.2.*\"}, {\"status\": \"unaffected\", \"version\": \"7.3\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"net/core/xdp.c\"], \"defaultStatus\": \"affected\"}], \"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\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"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 ...\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.270\", \"versionStartIncluding\": \"4.20\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.221\", \"versionStartIncluding\": \"4.20\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.188\", \"versionStartIncluding\": \"4.20\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.157\", \"versionStartIncluding\": \"4.20\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.109\", \"versionStartIncluding\": \"4.20\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.50\", \"versionStartIncluding\": \"4.20\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.2.4\", \"versionStartIncluding\": \"4.20\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.3\", \"versionStartIncluding\": \"4.20\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-10-19T08:46:26.611Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-81002\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-19T08:46:26.611Z\", \"dateReserved\": \"2026-08-26T14:34:25.812Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-09-11T19:42:55.506Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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