{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-31481", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-03-09T15:48:24.100Z", "datePublished": "2026-04-22T13:54:08.236Z", "dateUpdated": "2026-04-22T13:54:08.236Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-04-22T13:54:08.236Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntracing: Drain deferred trigger frees if kthread creation fails\n\nBoot-time trigger registration can fail before the trigger-data cleanup\nkthread exists. Deferring those frees until late init is fine, but the\npost-boot fallback must still drain the deferred list if kthread\ncreation never succeeds.\n\nOtherwise, boot-deferred nodes can accumulate on\ntrigger_data_free_list, later frees fall back to synchronously freeing\nonly the current object, and the older queued entries are leaked\nforever.\n\nTo trigger this, add the following to the kernel command line:\n\n trace_event=sched_switch trace_trigger=sched_switch.traceon,sched_switch.traceon\n\nThe second traceon trigger will fail and be freed. This triggers a NULL\npointer dereference and crashes the kernel.\n\nKeep the deferred boot-time behavior, but when kthread creation fails,\ndrain the whole queued list synchronously. Do the same in the late-init\ndrain path so queued entries are not stranded there either."}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["kernel/trace/trace_events_trigger.c"], "versions": [{"version": "61d445af0a7c70018111919e47beaaee15653f2f", "lessThan": "771624b7884a83bb9f922ae64ee41a5f8b7576c9", "status": "affected", "versionType": "git"}, {"version": "61d445af0a7c70018111919e47beaaee15653f2f", "lessThan": "250ab25391edeeab8462b68be42e4904506c409c", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["kernel/trace/trace_events_trigger.c"], "versions": [{"version": "6.19", "status": "affected"}, {"version": "0", "lessThan": "6.19", "status": "unaffected", "versionType": "semver"}, {"version": "6.19.11", "lessThanOrEqual": "6.19.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.0", "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": "6.19", "versionEndExcluding": "6.19.11"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.19", "versionEndExcluding": "7.0"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/771624b7884a83bb9f922ae64ee41a5f8b7576c9"}, {"url": "https://git.kernel.org/stable/c/250ab25391edeeab8462b68be42e4904506c409c"}], "title": "tracing: Drain deferred trigger frees if kthread creation fails", "x_generator": {"engine": "bippy-1.2.0"}}}}

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{"bugzilla": {"description": "kernel: tracing: Drain deferred trigger frees if kthread creation fails", "id": "2460687", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2460687"}, "csaw": false, "cwe": "CWE-772", "details": ["A flaw was found in the Linux kernel. A local user can exploit this vulnerability by providing specific kernel command line parameters during boot, which can lead to a NULL pointer dereference. This issue occurs due to improper handling of deferred trigger frees when kernel thread (kthread) creation fails. Successful exploitation can cause the system to crash, resulting in a Denial of Service (DoS)."], "name": "CVE-2026-31481", "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"}], "public_date": "2026-04-22T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-31481\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-31481\nhttps://lore.kernel.org/linux-cve-announce/2026042258-CVE-2026-31481-390e@gregkh/T"]}