{"id":"CVE-2026-81002","title":"xdp: fix zero-copy frame layout","summary":"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 copi…","severity":"critical","cvss":9.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cvssSource":"cna","cwe":["CWE-787"],"vendor":"Linux","product":"Linux","affected":["Linux >= b0d1beeff2a97a0cf1965ea8f1d13b8973f22582 < dcb6db9ca6515fcd3e00c93ec5e27dc7a0a7012f","Linux >= b0d1beeff2a97a0cf1965ea8f1d13b8973f22582 < 22092730129077c302d8c947bbe0876f0280c528","Linux >= b0d1beeff2a97a0cf1965ea8f1d13b8973f22582 < ced3e18cd9b9caf630aaa1e1eac305f5192ba896","Linux >= b0d1beeff2a97a0cf1965ea8f1d13b8973f22582 < 6de17275b3ccdf9887568b07e54da2e3597217cf","Linux >= b0d1beeff2a97a0cf1965ea8f1d13b8973f22582 < 444216dacdbebd3e52d5e704facafbb230da09e9","Linux >= b0d1beeff2a97a0cf1965ea8f1d13b8973f22582 < 15d1f3c0dbe7a740f779337deb39f23cd8d002c8","Linux >= b0d1beeff2a97a0cf1965ea8f1d13b8973f22582 < 68d7cc5512238693670fc19c7a615df631e10edf","Linux >= b0d1beeff2a97a0cf1965ea8f1d13b8973f22582 < 71283aaa6c65b3cec84caf1dc78560985737641f","Linux 4.20"],"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"total","timestamp":"2026-10-16T19:22:09.618662Z"},"published":"2026-09-11","updated":"2026-10-19","sourceUpdated":"2026-10-19T08:46:26.611Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-81002","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"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-81002.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-81002"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2532133"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-81002"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-81002"},{"url":"https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-81002.mbox"}],"tags":["cve.org","csaf","vex","red-hat","score-dispute"],"epss":0.00514,"epssPercentile":0.4361,"scores":{"cna":9.8,"vendor":7},"ingestedAt":"2026-09-14T15:23:07.454Z","slug":"CVE-2026-81002","body":"## Overview\n\nIn 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 ...\n\n## Affected\n\n- `Linux >= b0d1beeff2a97a0cf1965ea8f1d13b8973f22582 < dcb6db9ca6515fcd3e00c93ec5e27dc7a0a7012f`\n- `Linux >= b0d1beeff2a97a0cf1965ea8f1d13b8973f22582 < 22092730129077c302d8c947bbe0876f0280c528`\n- `Linux >= b0d1beeff2a97a0cf1965ea8f1d13b8973f22582 < ced3e18cd9b9caf630aaa1e1eac305f5192ba896`\n- `Linux >= b0d1beeff2a97a0cf1965ea8f1d13b8973f22582 < 6de17275b3ccdf9887568b07e54da2e3597217cf`\n- `Linux >= b0d1beeff2a97a0cf1965ea8f1d13b8973f22582 < 444216dacdbebd3e52d5e704facafbb230da09e9`\n- `Linux >= b0d1beeff2a97a0cf1965ea8f1d13b8973f22582 < 15d1f3c0dbe7a740f779337deb39f23cd8d002c8`\n- `Linux >= b0d1beeff2a97a0cf1965ea8f1d13b8973f22582 < 68d7cc5512238693670fc19c7a615df631e10edf`\n- `Linux >= b0d1beeff2a97a0cf1965ea8f1d13b8973f22582 < 71283aaa6c65b3cec84caf1dc78560985737641f`\n- `Linux 4.20`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Moderate · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9, Red Hat OpenShift Container Platform 4 · updated 2026-09-14 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-81002.json)","depth":"midnight","depthScore":54,"depthScoreParts":{"impact":53.9,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[{"seq":223323,"id":"CVE-2026-81002","ts":1792180057251,"field":"cvss","old":"7","new":"9.8"},{"seq":223322,"id":"CVE-2026-81002","ts":1792180057251,"field":"severity","old":"high","new":"critical"},{"seq":204142,"id":"CVE-2026-81002","ts":1789490232167,"field":"cvss","old":"9.8","new":"7"},{"seq":204141,"id":"CVE-2026-81002","ts":1789490232167,"field":"severity","old":"critical","new":"high"},{"seq":183797,"id":"CVE-2026-81002","ts":1789356677433,"field":"cvss","old":"9.8","new":"5.9"},{"seq":183796,"id":"CVE-2026-81002","ts":1789356677433,"field":"severity","old":"critical","new":"medium"},{"seq":153194,"id":"CVE-2026-81002","ts":1789285349496,"field":"cvss","old":null,"new":"9.8"},{"seq":153193,"id":"CVE-2026-81002","ts":1789285349496,"field":"severity","old":"none","new":"critical"},{"seq":147752,"id":"CVE-2026-81002","ts":1789270212153,"field":"cvss","old":null,"new":"5.9"},{"seq":147751,"id":"CVE-2026-81002","ts":1789270212153,"field":"severity","old":"none","new":"medium"},{"seq":109504,"id":"CVE-2026-81002","ts":1789183732188,"field":"cvss","old":null,"new":"5.9"},{"seq":109503,"id":"CVE-2026-81002","ts":1789183732188,"field":"severity","old":"none","new":"medium"}]}