{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "kernel/trace/trace_events_trigger.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "771624b7884a83bb9f922ae64ee41a5f8b7576c9",
              "status": "affected",
              "version": "61d445af0a7c70018111919e47beaaee15653f2f",
              "versionType": "git"
            },
            {
              "lessThan": "250ab25391edeeab8462b68be42e4904506c409c",
              "status": "affected",
              "version": "61d445af0a7c70018111919e47beaaee15653f2f",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "kernel/trace/trace_events_trigger.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.19"
            },
            {
              "lessThan": "6.19",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.19.*",
              "status": "unaffected",
              "version": "6.19.11",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.0",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.19.11",
                  "versionStartIncluding": "6.19",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0",
                  "versionStartIncluding": "6.19",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-04-22T13:54:08.236Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "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"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-31481",
    "datePublished": "2026-04-22T13:54:08.236Z",
    "dateReserved": "2026-03-09T15:48:24.100Z",
    "dateUpdated": "2026-04-22T13:54:08.236Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-31481\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-04-22T14:16:45.340\",\"lastModified\":\"2026-04-22T14:16:45.340\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"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.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/250ab25391edeeab8462b68be42e4904506c409c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/771624b7884a83bb9f922ae64ee41a5f8b7576c9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}