{"id":"CVE-2026-98631","summary":"xsk: Use a 32-bit compare in xsk_map_gen_lookup","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nxsk: Use a 32-bit compare in xsk_map_gen_lookup\n\nxsk_map_gen_lookup() loads a u32 key and compares it with max_entries\nusing BPF_JMP_IMM. BPF immediates are sign-extended to 64 bits, so a\nmax_entries value of 0x80000000 or higher becomes a threshold larger\nthan every zero-extended 32-bit key. An out-of-range index then skips\nthe bounds check and the generated lookup reads past xsk_map[].\n\nCompare with BPF_JMP32_IMM so the check stays in 32-bit unsigned range.","modified":"2026-10-19T02:47:00.134871807Z","published":"2026-10-18T15:19:53.529Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98631.json"},"references":[{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"},{"type":"WEB","url":"https://git.kernel.org/stable/c/11d9be35c1f4233798e99be98bc474f83a254c6c"},{"type":"WEB","url":"https://git.kernel.org/stable/c/123f90f394ca404ab8796a7c8072ff7fa5b65a9c"},{"type":"WEB","url":"https://git.kernel.org/stable/c/227ec890559e922e235eb543646e3bf0bd8269b0"},{"type":"WEB","url":"https://git.kernel.org/stable/c/36461e58f88a1b723f86693f437ac12e60ff4363"},{"type":"WEB","url":"https://git.kernel.org/stable/c/3c1e0a4bc156b8d5c5772dbc76b9ea74dce5ca24"},{"type":"WEB","url":"https://git.kernel.org/stable/c/70504de0bb627848667207bec7ccfd647deb8814"},{"type":"WEB","url":"https://git.kernel.org/stable/c/b5c0cff0c5331582ab01c4c423731453a8381acc"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c6d5c582d55a8f229d75e98d62eaa065b0deb18d"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/98xxx/CVE-2026-98631.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-98631"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"e65650f291ee72fc578d6346080fc4699204ef2c"},{"fixed":"c6d5c582d55a8f229d75e98d62eaa065b0deb18d"},{"fixed":"227ec890559e922e235eb543646e3bf0bd8269b0"},{"fixed":"11d9be35c1f4233798e99be98bc474f83a254c6c"},{"fixed":"123f90f394ca404ab8796a7c8072ff7fa5b65a9c"},{"fixed":"36461e58f88a1b723f86693f437ac12e60ff4363"},{"fixed":"b5c0cff0c5331582ab01c4c423731453a8381acc"},{"fixed":"3c1e0a4bc156b8d5c5772dbc76b9ea74dce5ca24"},{"fixed":"70504de0bb627848667207bec7ccfd647deb8814"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-98631.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"5.5.0"},{"fixed":"5.10.271"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.222"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.189"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.158"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.112"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.55"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.2.9"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-98631.json"}}],"schema_version":"1.9.0"}