FKIE_CVE-2025-40260

Vulnerability from fkie_nvd - Published: 2025-12-04 16:16 - Updated: 2026-06-17 09:21
Severity
Summary
In the Linux kernel, the following vulnerability has been resolved: sched_ext: Fix scx_enable() crash on helper kthread creation failure A crash was observed when the sched_ext selftests runner was terminated with Ctrl+\ while test 15 was running: NIP [c00000000028fa58] scx_enable.constprop.0+0x358/0x12b0 LR [c00000000028fa2c] scx_enable.constprop.0+0x32c/0x12b0 Call Trace: scx_enable.constprop.0+0x32c/0x12b0 (unreliable) bpf_struct_ops_link_create+0x18c/0x22c __sys_bpf+0x23f8/0x3044 sys_bpf+0x2c/0x6c system_call_exception+0x124/0x320 system_call_vectored_common+0x15c/0x2ec kthread_run_worker() returns an ERR_PTR() on failure rather than NULL, but the current code in scx_alloc_and_add_sched() only checks for a NULL helper. Incase of failure on SIGQUIT, the error is not handled in scx_alloc_and_add_sched() and scx_enable() ends up dereferencing an error pointer. Error handling is fixed in scx_alloc_and_add_sched() to propagate PTR_ERR() into ret, so that scx_enable() jumps to the existing error path, avoiding random dereference on failure.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/625e173e2a59b6cf6cbfb51c0a6bea47f3861eab
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/7b6216baae751369195fa3c83d434d23bcda406a
Impacted products
Vendor Product Version
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{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "kernel/sched/ext.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "625e173e2a59b6cf6cbfb51c0a6bea47f3861eab",
              "status": "affected",
              "version": "bff3b5aec1b727b620adc7c47085592802390125",
              "versionType": "git"
            },
            {
              "lessThan": "7b6216baae751369195fa3c83d434d23bcda406a",
              "status": "affected",
              "version": "bff3b5aec1b727b620adc7c47085592802390125",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "kernel/sched/ext.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.16"
            },
            {
              "lessThan": "6.16",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.17.*",
              "status": "unaffected",
              "version": "6.17.10",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.18",
              "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\nsched_ext: Fix scx_enable() crash on helper kthread creation failure\n\nA crash was observed when the sched_ext selftests runner was\nterminated with Ctrl+\\ while test 15 was running:\n\nNIP [c00000000028fa58] scx_enable.constprop.0+0x358/0x12b0\nLR [c00000000028fa2c] scx_enable.constprop.0+0x32c/0x12b0\nCall Trace:\nscx_enable.constprop.0+0x32c/0x12b0 (unreliable)\nbpf_struct_ops_link_create+0x18c/0x22c\n__sys_bpf+0x23f8/0x3044\nsys_bpf+0x2c/0x6c\nsystem_call_exception+0x124/0x320\nsystem_call_vectored_common+0x15c/0x2ec\n\nkthread_run_worker() returns an ERR_PTR() on failure rather than NULL,\nbut the current code in scx_alloc_and_add_sched() only checks for a NULL\nhelper. Incase of failure on SIGQUIT, the error is not handled in\nscx_alloc_and_add_sched() and scx_enable() ends up dereferencing an\nerror pointer.\n\nError handling is fixed in scx_alloc_and_add_sched() to propagate\nPTR_ERR() into ret, so that scx_enable() jumps to the existing error\npath, avoiding random dereference on failure."
    }
  ],
  "id": "CVE-2025-40260",
  "lastModified": "2026-06-17T09:21:33.007",
  "metrics": {},
  "published": "2025-12-04T16:16:19.927",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/625e173e2a59b6cf6cbfb51c0a6bea47f3861eab"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/7b6216baae751369195fa3c83d434d23bcda406a"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Deferred"
}


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