CVE-2025-40260 (GCVE-0-2025-40260)

Vulnerability from cvelistv5 – Published: 2025-12-04 16:08 – Updated: 2025-12-04 16:08
VLAI?
Title
sched_ext: Fix scx_enable() crash on helper kthread creation failure
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.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: bff3b5aec1b727b620adc7c47085592802390125 , < 625e173e2a59b6cf6cbfb51c0a6bea47f3861eab (git)
Affected: bff3b5aec1b727b620adc7c47085592802390125 , < 7b6216baae751369195fa3c83d434d23bcda406a (git)
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    Linux Linux Affected: 6.16
Unaffected: 0 , < 6.16 (semver)
Unaffected: 6.17.10 , ≤ 6.17.* (semver)
Unaffected: 6.18 , ≤ * (original_commit_for_fix)
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{
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          "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."
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        "dateUpdated": "2025-12-04T16:08:20.590Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/625e173e2a59b6cf6cbfb51c0a6bea47f3861eab"
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          "url": "https://git.kernel.org/stable/c/7b6216baae751369195fa3c83d434d23bcda406a"
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    "cveId": "CVE-2025-40260",
    "datePublished": "2025-12-04T16:08:20.590Z",
    "dateReserved": "2025-04-16T07:20:57.182Z",
    "dateUpdated": "2025-12-04T16:08:20.590Z",
    "state": "PUBLISHED"
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    "nvd": "{\"cve\":{\"id\":\"CVE-2025-40260\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-12-04T16:16:19.927\",\"lastModified\":\"2025-12-04T17:15:08.283\",\"vulnStatus\":\"Awaiting Analysis\",\"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.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/625e173e2a59b6cf6cbfb51c0a6bea47f3861eab\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/7b6216baae751369195fa3c83d434d23bcda406a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
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