FKIE_CVE-2026-90066

Vulnerability from fkie_nvd - Published: 2026-09-17 17:16 - Updated: 2026-09-17 17:16
Severity
Summary
In the Linux kernel, the following vulnerability has been resolved: samples/ftrace: Fix kthread_stop() on ERR_PTR in ftrace-direct-multi-modify ftrace_direct_multi_init() assigns kthread_run()'s return value to simple_tsk without an IS_ERR() check. When kthread_run() fails it returns ERR_PTR(-ENOMEM), but init still returns 0, so the module loads with simple_tsk holding an error pointer. On unload, ftrace_direct_multi_exit() then passes that ERR_PTR to kthread_stop(), leading to a null-pointer-dereference. Check the return value of kthread_run() with IS_ERR(); on failure, unregister the ftrace direct call and propagate the error code.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/626614df9080d7052fbe24dc90b5434717ab7a9f
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/6727b7618f49401acf373fa3ec5712e2ec52e5cf
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7a96b9f6d5ba23dbce66c8a4a242effd4c01a830
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/98b7b2a29ae87937aa02ab9391543ef8c602cd94
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/cf839636911d8313f3ecd098329fd0b96499e4cf
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "samples/ftrace/ftrace-direct-multi-modify.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "7a96b9f6d5ba23dbce66c8a4a242effd4c01a830",
              "status": "affected",
              "version": "e1067a07cfbc5a36abad3752fafe4c79e06db1bb",
              "versionType": "git"
            },
            {
              "lessThan": "98b7b2a29ae87937aa02ab9391543ef8c602cd94",
              "status": "affected",
              "version": "e1067a07cfbc5a36abad3752fafe4c79e06db1bb",
              "versionType": "git"
            },
            {
              "lessThan": "626614df9080d7052fbe24dc90b5434717ab7a9f",
              "status": "affected",
              "version": "e1067a07cfbc5a36abad3752fafe4c79e06db1bb",
              "versionType": "git"
            },
            {
              "lessThan": "cf839636911d8313f3ecd098329fd0b96499e4cf",
              "status": "affected",
              "version": "e1067a07cfbc5a36abad3752fafe4c79e06db1bb",
              "versionType": "git"
            },
            {
              "lessThan": "6727b7618f49401acf373fa3ec5712e2ec52e5cf",
              "status": "affected",
              "version": "e1067a07cfbc5a36abad3752fafe4c79e06db1bb",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "samples/ftrace/ftrace-direct-multi-modify.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "5.16"
            },
            {
              "lessThan": "5.16",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.157",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.110",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.52",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc1",
              "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\nsamples/ftrace: Fix kthread_stop() on ERR_PTR in ftrace-direct-multi-modify\n\nftrace_direct_multi_init() assigns kthread_run()\u0027s return value to\nsimple_tsk without an IS_ERR() check. When kthread_run() fails it\nreturns ERR_PTR(-ENOMEM), but init still returns 0, so the module loads\nwith simple_tsk holding an error pointer. On unload,\nftrace_direct_multi_exit() then passes that ERR_PTR to kthread_stop(),\nleading to a null-pointer-dereference.\n\nCheck the return value of kthread_run() with IS_ERR(); on failure,\nunregister the ftrace direct call and propagate the error code."
    }
  ],
  "id": "CVE-2026-90066",
  "lastModified": "2026-09-17T17:16:55.437",
  "metrics": {},
  "published": "2026-09-17T17:16:55.437",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/626614df9080d7052fbe24dc90b5434717ab7a9f"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/6727b7618f49401acf373fa3ec5712e2ec52e5cf"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/7a96b9f6d5ba23dbce66c8a4a242effd4c01a830"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/98b7b2a29ae87937aa02ab9391543ef8c602cd94"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/cf839636911d8313f3ecd098329fd0b96499e4cf"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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