{"schema":"threatline.record/2","record":{"id":"CVE-2026-98801","aliases":[],"summary":"net: restrict SO_RESERVE_MEM to TCP sockets and cap max value","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet: restrict SO_RESERVE_MEM to TCP sockets and cap max value\n\nCommit 2bb2f5fb21b0 (\"net: add new socket option SO_RESERVE_MEM\") and\ncommit d00c8ee31729 (\"net: fix possible NULL deref in sock_reserve_memory\")\nonly checked sk_has_account(sk), which is true for both TCP and UDP\nsockets.\n\nHowever, SO_RESERVE_MEM and sk_unused_reserved_mem() are currently only\nsupported by TCP:\n- On UDP sockets, sk->sk_forward_alloc is protected by\n  sk->sk_receive_queue.lock, whereas sock_reserve_memory() and\n  sock_release_reserved_memory() only acquire lock_sock(sk). Concurrent\n  UDP packet reception/release and setsockopt(SO_RESERVE_MEM) corrupt\n  sk_forward_alloc and memcg accounting.\n- udp_rmem_release() reclaims excess sk_forward_alloc without\n  accounting for sk_unused_reserved_mem(sk).\n\nRestrict sock_reserve_memory() to TCP sockets (sk_is_tcp(sk)) for now.\nSupporting SO_RESERVE_MEM for UDP (acquiring sk_receive_queue.lock and\nhonoring sk_unused_reserved_mem() in udp_rmem_release()) can be done in\na future net-next series if needed.\n\nIn addition, reject val > SZ_1G with -EINVAL in\nsk_setsockopt(SO_RESERVE_MEM). Without an upper bound, values near\nINT_MAX cause sk_mem_pages(delta) and (pages << PAGE_SHIFT) to overflow\n32-bit signed int, corrupting sk->sk_forward_alloc and\nsk->sk_reserved_mem. Using a page-aligned cap (SZ_1G) ensures that the\npage-rounded sk->sk_reserved_mem reported by getsockopt(SO_RESERVE_MEM)\ncan always be passed back to setsockopt(SO_RESERVE_MEM).","categories":["Operating systems"],"product":"Linux","vendor":"Linux","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98801","source_modified_at":"2026-10-19T09:25:54.691Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","versions":[{"version":"2bb2f5fb21b0486ff69b7b4a1fe03a760527d133","lessThan":"492e04f9a00f3cc88a1f6899417b10f3019a624e","status":"affected","versionType":"git"},{"version":"2bb2f5fb21b0486ff69b7b4a1fe03a760527d133","lessThan":"5069ce898148bd799395c5a464e006cbb840f188","status":"affected","versionType":"git"},{"version":"2bb2f5fb21b0486ff69b7b4a1fe03a760527d133","lessThan":"a467b05b201b5c26be52ed3081992fa9c0387648","status":"affected","versionType":"git"},{"version":"2bb2f5fb21b0486ff69b7b4a1fe03a760527d133","lessThan":"37e02c42a00be692c06343e11779aadc45f45971","status":"affected","versionType":"git"}],"defaultStatus":"unaffected"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98801","source_modified_at":"2026-10-19T09:25:54.691Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","versions":[{"version":"5.16","status":"affected"},{"version":"0","lessThan":"5.16","status":"unaffected","versionType":"semver"},{"version":"6.12.113","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.56","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.2.10","lessThanOrEqual":"7.2.*","status":"unaffected","versionType":"semver"},{"version":"7.3","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}],"defaultStatus":"affected"}],"fixed_versions":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98801","source_modified_at":"2026-10-19T09:25:54.691Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"492e04f9a00f3cc88a1f6899417b10f3019a624e","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98801","source_modified_at":"2026-10-19T09:25:54.691Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"5069ce898148bd799395c5a464e006cbb840f188","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98801","source_modified_at":"2026-10-19T09:25:54.691Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"37e02c42a00be692c06343e11779aadc45f45971","basis":"first unaffected version stated in the CVE record"}],"cvss":null,"severity":null,"kev":{"listed":false},"epss":{"probability":0.00168,"percentile":0.05741,"score_date":"2026-10-23"},"published_at":"2026-10-18T15:48:47.171Z","modified_at":"2026-10-19T09:25:54.691Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-98801","fetched_at":"2026-10-23T18:45:31.882637Z","source_modified_at":"2026-10-19T09:25:54.691Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-98801","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","EPSS"],"references":[{"source":"CVE List","url":"https://git.kernel.org/stable/c/492e04f9a00f3cc88a1f6899417b10f3019a624e"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/5069ce898148bd799395c5a464e006cbb840f188"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/a467b05b201b5c26be52ed3081992fa9c0387648"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/37e02c42a00be692c06343e11779aadc45f45971"}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":"product","confidence":"heuristic","reviewed":false},"change_timestamp":"2026-10-19T09:25:54.691Z","content_hash":"5cd97e0792f1e6702cabc59cf14a63fc0c1eec0bf4d7508b4d23a52b32ba370f"}}