{"id":"CVE-2026-98812","aliases":[],"cve":{"records":[{"id":"CVE-2026-98812","source":"Linux","state":"PUBLISHED","reasons":[],"replacements":[],"disputed":false,"unsupportedWhenAssigned":false,"reserved":"2026-09-25T10:25:14.371Z","published":"2026-10-18T15:48:58.470Z","modified":"2026-10-30T12:39:58.094Z"}],"publishers":[{"name":"Linux","role":"CNA","organizationId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","modified":"2026-10-30T12:39:58.094Z"}],"references":[{"url":"https://git.kernel.org/stable/c/58a270b5ecd8629114a4754d642bad6a33bef493","tags":[],"source":"Linux"},{"url":"https://git.kernel.org/stable/c/fdf09d0fa2fb639950bede185d22689f68df140e","tags":[],"source":"Linux"},{"url":"https://git.kernel.org/stable/c/288ef37e0c463192dbb6436e61cdc07ce666dcb9","tags":[],"source":"Linux"},{"url":"https://git.kernel.org/stable/c/af6e4f931afc2d670d133aa2bedc8b6e3753c618","tags":[],"source":"Linux"},{"url":"https://git.kernel.org/stable/c/63120572edde85bb2b70b0ed4d4817ed52247613","tags":[],"source":"Linux"},{"url":"https://git.kernel.org/stable/c/f37f42e6e039a48c2dcf6c079b9f7fbc864ab7ef","tags":[],"source":"Linux"},{"url":"https://git.kernel.org/stable/c/aadf655e8ea9a8ffa24bb8d69f504572e8d18181","tags":[],"source":"Linux"}],"weaknesses":[],"applicability":[{"source":"Linux","statements":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"5.15.224"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"6.1.191"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"6.6.160"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"6.12.113"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"6.18.56"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"7.2.10"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.15","versionEndExcluding":"7.3"}]}]}]}],"prioritization":[]},"title":"net/mctp: publish the mctp_dev only after it is initialised","titleSource":"Linux","descriptionSource":"Linux","description":"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.","score":null,"severity":"unknown","published":"2026-10-18T15:48:58.470Z","modified":"2026-10-30T12:39:58.094Z","withdrawn":false,"knownExploited":false,"affected":[],"products":[{"vendor":"Linux","name":"Linux","platforms":[],"versions":[{"version":"583be982d93479ea3d85091b0fd0b01201ede87d","status":"affected","lessThan":"58a270b5ecd8629114a4754d642bad6a33bef493","versionType":"git"},{"version":"583be982d93479ea3d85091b0fd0b01201ede87d","status":"affected","lessThan":"fdf09d0fa2fb639950bede185d22689f68df140e","versionType":"git"},{"version":"583be982d93479ea3d85091b0fd0b01201ede87d","status":"affected","lessThan":"288ef37e0c463192dbb6436e61cdc07ce666dcb9","versionType":"git"},{"version":"583be982d93479ea3d85091b0fd0b01201ede87d","status":"affected","lessThan":"af6e4f931afc2d670d133aa2bedc8b6e3753c618","versionType":"git"},{"version":"583be982d93479ea3d85091b0fd0b01201ede87d","status":"affected","lessThan":"63120572edde85bb2b70b0ed4d4817ed52247613","versionType":"git"},{"version":"583be982d93479ea3d85091b0fd0b01201ede87d","status":"affected","lessThan":"f37f42e6e039a48c2dcf6c079b9f7fbc864ab7ef","versionType":"git"},{"version":"583be982d93479ea3d85091b0fd0b01201ede87d","status":"affected","lessThan":"aadf655e8ea9a8ffa24bb8d69f504572e8d18181","versionType":"git"}],"defaultStatus":"unaffected","cpes":[],"source":"Linux","url":"https://www.cve.org/CVERecord?id=CVE-2026-98812"},{"vendor":"Linux","name":"Linux","platforms":[],"versions":[{"version":"5.15","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.15","versionType":"semver"},{"version":"5.15.224","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.191","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.160","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.113","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.56","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.10","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"defaultStatus":"affected","cpes":[],"source":"Linux","url":"https://www.cve.org/CVERecord?id=CVE-2026-98812"}],"remediation":[],"references":["https://git.kernel.org/stable/c/58a270b5ecd8629114a4754d642bad6a33bef493","https://git.kernel.org/stable/c/fdf09d0fa2fb639950bede185d22689f68df140e","https://git.kernel.org/stable/c/288ef37e0c463192dbb6436e61cdc07ce666dcb9","https://git.kernel.org/stable/c/af6e4f931afc2d670d133aa2bedc8b6e3753c618","https://git.kernel.org/stable/c/63120572edde85bb2b70b0ed4d4817ed52247613","https://git.kernel.org/stable/c/f37f42e6e039a48c2dcf6c079b9f7fbc864ab7ef","https://git.kernel.org/stable/c/aadf655e8ea9a8ffa24bb8d69f504572e8d18181"],"sources":[{"name":"CVE","id":"CVE-2026-98812","modified":"2026-10-30T12:39:58.094Z","url":"https://www.cve.org/CVERecord?id=CVE-2026-98812"}],"assessments":[],"sourceAffected":[],"observedAt":"2026-10-30T13:09:26.443Z","kev":{"status":"not-listed","checkedAt":"2026-11-15T02:45:32.518Z"},"coverage":[{"source":"NVD","status":"not-checked"},{"source":"GHSA","status":"not-checked"},{"source":"EUVD","status":"not-checked"},{"source":"EPSS","status":"not-checked"}],"evidence":[],"aiSummary":{"text":"The Linux kernel's net/mctp module has a vulnerability where the mctp_dev is published before it is initialized, allowing a reader to dereference a null net_device pointer. This affects Linux kernel versions starting from 5.15. The impact of this vulnerability is a null pointer dereference.","model":"@cf/meta/llama-3.3-70b-instruct-fp8-fast","generatedAt":"2026-10-30T13:51:10.651Z","sources":[{"name":"CVE","url":"https://www.cve.org/CVERecord?id=CVE-2026-98812"}]}}