CVE-2026-98812

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-98812", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-25T10:25:14.371Z", "datePublished": "2026-10-18T15:48:58.470Z", "dateUpdated": "2026-10-30T12:39:58.094Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-30T12:39:58.094Z"}, "descriptions": [{"lang": "en", "value": "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."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/mctp/device.c"], "versions": [{"version": "583be982d93479ea3d85091b0fd0b01201ede87d", "lessThan": "58a270b5ecd8629114a4754d642bad6a33bef493", "status": "affected", "versionType": "git"}, {"version": "583be982d93479ea3d85091b0fd0b01201ede87d", "lessThan": "fdf09d0fa2fb639950bede185d22689f68df140e", "status": "affected", "versionType": "git"}, {"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"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/mctp/device.c"], "versions": [{"version": "5.15", "status": "affected"}, {"version": "0", "lessThan": "5.15", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.224", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.191", "lessThanOrEqual": "6.1.*", "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"}]}], "cpeApplicability": [{"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"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/58a270b5ecd8629114a4754d642bad6a33bef493"}, {"url": "https://git.kernel.org/stable/c/fdf09d0fa2fb639950bede185d22689f68df140e"}, {"url": "https://git.kernel.org/stable/c/288ef37e0c463192dbb6436e61cdc07ce666dcb9"}, {"url": "https://git.kernel.org/stable/c/af6e4f931afc2d670d133aa2bedc8b6e3753c618"}, {"url": "https://git.kernel.org/stable/c/63120572edde85bb2b70b0ed4d4817ed52247613"}, {"url": "https://git.kernel.org/stable/c/f37f42e6e039a48c2dcf6c079b9f7fbc864ab7ef"}, {"url": "https://git.kernel.org/stable/c/aadf655e8ea9a8ffa24bb8d69f504572e8d18181"}], "title": "net/mctp: publish the mctp_dev only after it is initialised", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["net/mctp/device.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "58a270b5ecd8629114a4754d642bad6a33bef493", "status": "affected", "version": "583be982d93479ea3d85091b0fd0b01201ede87d", "versionType": "git"}, {"lessThan": "fdf09d0fa2fb639950bede185d22689f68df140e", "status": "affected", "version": "583be982d93479ea3d85091b0fd0b01201ede87d", "versionType": "git"}, {"lessThan": "288ef37e0c463192dbb6436e61cdc07ce666dcb9", "status": "affected", "version": "583be982d93479ea3d85091b0fd0b01201ede87d", "versionType": "git"}, {"lessThan": "af6e4f931afc2d670d133aa2bedc8b6e3753c618", "status": "affected", "version": "583be982d93479ea3d85091b0fd0b01201ede87d", "versionType": "git"}, {"lessThan": "63120572edde85bb2b70b0ed4d4817ed52247613", "status": "affected", "version": "583be982d93479ea3d85091b0fd0b01201ede87d", "versionType": "git"}, {"lessThan": "f37f42e6e039a48c2dcf6c079b9f7fbc864ab7ef", "status": "affected", "version": "583be982d93479ea3d85091b0fd0b01201ede87d", "versionType": "git"}, {"lessThan": "aadf655e8ea9a8ffa24bb8d69f504572e8d18181", "status": "affected", "version": "583be982d93479ea3d85091b0fd0b01201ede87d", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["net/mctp/device.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "5.15"}, {"lessThan": "5.15", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.224", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.191", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.160", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.113", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.56", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.10", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.3", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "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."}], "id": "CVE-2026-98812", "lastModified": "2026-10-30T13:21:28.907", "metrics": {}, "published": "2026-10-18T16:17:35.313", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/288ef37e0c463192dbb6436e61cdc07ce666dcb9"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/58a270b5ecd8629114a4754d642bad6a33bef493"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/63120572edde85bb2b70b0ed4d4817ed52247613"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/aadf655e8ea9a8ffa24bb8d69f504572e8d18181"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/af6e4f931afc2d670d133aa2bedc8b6e3753c618"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/f37f42e6e039a48c2dcf6c079b9f7fbc864ab7ef"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/fdf09d0fa2fb639950bede185d22689f68df140e"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: net/mctp: publish the mctp_dev only after it is initialised", "id": "2555202", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2555202"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-476", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nnet/mctp: publish the mctp_dev only after it is initialised\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:\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)\ndo_syscall_64 (arch/x86/entry/syscall_64.c:63)\nentry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:121)\n</TASK>\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.", "A flaw was found in the Linux kernel's Management Component Transport Protocol (MCTP) subsystem. This vulnerability allows a local user to cause a Denial of Service (DoS) by triggering a kernel crash. During device setup, the kernel exposes the network device object before its internal pointers are fully initialized. A concurrent operation accessing the uninitialized device dereferences a null pointer, crashing the system."], "name": "CVE-2026-98812", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Not affected", "package_name": "openshift/ose-rhel-coreos-8", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Not affected", "package_name": "openshift/ose-rhel-coreos-9", "product_name": "Red Hat OpenShift Container Platform 4"}], "public_date": "2026-10-18T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-98812\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-98812\nhttps://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-98812.mbox"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[583be982d93479ea3d85091b0fd0b01201ede87d,af6e4f931afc2d670d133aa2bedc8b6e3753c618)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[583be982d93479ea3d85091b0fd0b01201ede87d,63120572edde85bb2b70b0ed4d4817ed52247613)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[583be982d93479ea3d85091b0fd0b01201ede87d,f37f42e6e039a48c2dcf6c079b9f7fbc864ab7ef)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[583be982d93479ea3d85091b0fd0b01201ede87d,aadf655e8ea9a8ffa24bb8d69f504572e8d18181)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "5.15"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,5.15)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.113,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.56,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2.10,7.3.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.3,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-10-18T20:30:17.104531+00:00", "updated": "2026-10-24T04:30:08.035799+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}