{"schema":"threatline.record/2","record":{"id":"CVE-2026-98812","aliases":[],"summary":"net/mctp: publish the mctp_dev only after it is initialised","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nnet/mctp: publish the mctp_dev only after it is initialised\n\nmctp_add_dev() links the new mctp_dev into dev->mctp_ptr before mdev->dev\nis assigned, so a reader that picks the device up in that window\ndereferences a net_device pointer that is still NULL:\n\nKASAN: null-ptr-deref in range [0x00000000000000b0-0x00000000000000b7]\nCall Trace:\n <TASK>\n ? __pfx_mctp_sendmsg (./include/linux/sockptr.h:49)\n ? __pfx_mctp_dst_output (net/mctp/route.c:41)\n ? selinux_socket_sendmsg (security/selinux/hooks.c:5278)\n ____sys_sendmsg (net/socket.c:775 (discriminator 1) net/socket.c:790\n (discriminator 1) net/socket.c:2684 (discriminator 1))\n ? __pfx_____sys_sendmsg (net/socket.c:1131)\n ? __pfx_copy_msghdr_from_user (net/socket.c:2590)\n ? update_cfs_rq_load_avg (kernel/sched/fair.c:5478)\n ___sys_sendmsg (net/socket.c:2738)\n ? __pfx____sys_sendmsg (net/socket.c:2625)\n ? perf_event_task_tick (./include/linux/rcupdate.h:838)\n ? sched_tick (kernel/sched/core.c:5818)\n ? clockevents_program_event (kernel/time/clockevents.c:372)\n ? fdget (./include/linux/rcupdate.h:873 fs/file.c:1100)\n __sys_sendmsg (net/socket.c:2770)\n ? __pfx___sys_sendmsg (net/socket.c:2751)\n do_syscall_64 (arch/x86/entry/syscall_64.c:63)\n entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)\n </TASK>\n\nFix by publishing only once the object is fully initialised:\n__mctp_dev_get() runs under rcu_read_lock() only and hands\nthis object to readers as soon as mctp_ptr is assigned, so\nthey must never observe mdev->dev == NULL.","categories":["Operating systems"],"product":"Linux","vendor":"Linux","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98812","source_modified_at":"2026-10-21T12:57:11.501Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","versions":[{"version":"583be982d93479ea3d85091b0fd0b01201ede87d","lessThan":"288ef37e0c463192dbb6436e61cdc07ce666dcb9","status":"affected","versionType":"git"},{"version":"583be982d93479ea3d85091b0fd0b01201ede87d","lessThan":"af6e4f931afc2d670d133aa2bedc8b6e3753c618","status":"affected","versionType":"git"},{"version":"583be982d93479ea3d85091b0fd0b01201ede87d","lessThan":"63120572edde85bb2b70b0ed4d4817ed52247613","status":"affected","versionType":"git"},{"version":"583be982d93479ea3d85091b0fd0b01201ede87d","lessThan":"f37f42e6e039a48c2dcf6c079b9f7fbc864ab7ef","status":"affected","versionType":"git"},{"version":"583be982d93479ea3d85091b0fd0b01201ede87d","lessThan":"aadf655e8ea9a8ffa24bb8d69f504572e8d18181","status":"affected","versionType":"git"}],"defaultStatus":"unaffected"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98812","source_modified_at":"2026-10-21T12:57:11.501Z","fetched_at":"2026-10-23T18:45:31.882637Z","product":"Linux","vendor":"Linux","versions":[{"version":"5.15","status":"affected"},{"version":"0","lessThan":"5.15","status":"unaffected","versionType":"semver"},{"version":"6.6.160","lessThanOrEqual":"6.6.*","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-2026-98812","source_modified_at":"2026-10-21T12:57:11.501Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"288ef37e0c463192dbb6436e61cdc07ce666dcb9","basis":"first unaffected version stated in the CVE record"},{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-98812","source_modified_at":"2026-10-21T12:57:11.501Z","fetched_at":"2026-10-23T18:45:31.882637Z","package":{"name":"Linux","ecosystem":null},"version":"63120572edde85bb2b70b0ed4d4817ed52247613","basis":"first unaffected version stated in the CVE record"}],"cvss":null,"severity":null,"kev":{"listed":false},"epss":{"probability":0.00175,"percentile":0.06672,"score_date":"2026-10-23"},"published_at":"2026-10-18T15:48:58.470Z","modified_at":"2026-10-21T12:57:11.501Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-98812","fetched_at":"2026-10-23T18:45:31.882637Z","source_modified_at":"2026-10-21T12:57:11.501Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-98812","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/288ef37e0c463192dbb6436e61cdc07ce666dcb9"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/af6e4f931afc2d670d133aa2bedc8b6e3753c618"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/63120572edde85bb2b70b0ed4d4817ed52247613"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/f37f42e6e039a48c2dcf6c079b9f7fbc864ab7ef"},{"source":"CVE List","url":"https://git.kernel.org/stable/c/aadf655e8ea9a8ffa24bb8d69f504572e8d18181"}],"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":"2026-10-21T12:57:11.501Z","content_hash":"14327ad1b27110581cead6c35e9c820d176d4b2235afd060758c45fca9bfdf37"}}