CVE-2023-54316 (GCVE-0-2023-54316)

Vulnerability from cvelistv5 – Published: 2025-12-30 12:23 – Updated: 2025-12-30 12:23
VLAI?
Title
refscale: Fix uninitalized use of wait_queue_head_t
Summary
In the Linux kernel, the following vulnerability has been resolved: refscale: Fix uninitalized use of wait_queue_head_t Running the refscale test occasionally crashes the kernel with the following error: [ 8569.952896] BUG: unable to handle page fault for address: ffffffffffffffe8 [ 8569.952900] #PF: supervisor read access in kernel mode [ 8569.952902] #PF: error_code(0x0000) - not-present page [ 8569.952904] PGD c4b048067 P4D c4b049067 PUD c4b04b067 PMD 0 [ 8569.952910] Oops: 0000 [#1] PREEMPT_RT SMP NOPTI [ 8569.952916] Hardware name: Dell Inc. PowerEdge R750/0WMWCR, BIOS 1.2.4 05/28/2021 [ 8569.952917] RIP: 0010:prepare_to_wait_event+0x101/0x190 : [ 8569.952940] Call Trace: [ 8569.952941] <TASK> [ 8569.952944] ref_scale_reader+0x380/0x4a0 [refscale] [ 8569.952959] kthread+0x10e/0x130 [ 8569.952966] ret_from_fork+0x1f/0x30 [ 8569.952973] </TASK> The likely cause is that init_waitqueue_head() is called after the call to the torture_create_kthread() function that creates the ref_scale_reader kthread. Although this init_waitqueue_head() call will very likely complete before this kthread is created and starts running, it is possible that the calling kthread will be delayed between the calls to torture_create_kthread() and init_waitqueue_head(). In this case, the new kthread will use the waitqueue head before it is properly initialized, which is not good for the kernel's health and well-being. The above crash happened here: static inline void __add_wait_queue(...) { : if (!(wq->flags & WQ_FLAG_PRIORITY)) <=== Crash here The offset of flags from list_head entry in wait_queue_entry is -0x18. If reader_tasks[i].wq.head.next is NULL as allocated reader_task structure is zero initialized, the instruction will try to access address 0xffffffffffffffe8, which is exactly the fault address listed above. This commit therefore invokes init_waitqueue_head() before creating the kthread.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 653ed64b01dc5989f8f579d0038e987476c2c023 , < 066fbd8bc981cf49923bf828b7b4092894df577f (git)
Affected: 653ed64b01dc5989f8f579d0038e987476c2c023 , < ec9d118ad99dc6f1bc674c1e649c25533d89b9ba (git)
Affected: 653ed64b01dc5989f8f579d0038e987476c2c023 , < e0322a255a2242dbe4686b6176b3c83dea490529 (git)
Affected: 653ed64b01dc5989f8f579d0038e987476c2c023 , < e5de968a9032366198720eac4f368ed7e690b3ef (git)
Affected: 653ed64b01dc5989f8f579d0038e987476c2c023 , < 70a2856fd1d0a040c876ba9e3f89b949ae92e4dd (git)
Affected: 653ed64b01dc5989f8f579d0038e987476c2c023 , < f5063e8948dad7f31adb007284a5d5038ae31bb8 (git)
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    Linux Linux Affected: 5.9
Unaffected: 0 , < 5.9 (semver)
Unaffected: 5.10.195 , ≤ 5.10.* (semver)
Unaffected: 5.15.132 , ≤ 5.15.* (semver)
Unaffected: 6.1.53 , ≤ 6.1.* (semver)
Unaffected: 6.4.16 , ≤ 6.4.* (semver)
Unaffected: 6.5.3 , ≤ 6.5.* (semver)
Unaffected: 6.6 , ≤ * (original_commit_for_fix)
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{
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          "programFiles": [
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      "cpeApplicability": [
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nrefscale: Fix uninitalized use of wait_queue_head_t\n\nRunning the refscale test occasionally crashes the kernel with the\nfollowing error:\n\n[ 8569.952896] BUG: unable to handle page fault for address: ffffffffffffffe8\n[ 8569.952900] #PF: supervisor read access in kernel mode\n[ 8569.952902] #PF: error_code(0x0000) - not-present page\n[ 8569.952904] PGD c4b048067 P4D c4b049067 PUD c4b04b067 PMD 0\n[ 8569.952910] Oops: 0000 [#1] PREEMPT_RT SMP NOPTI\n[ 8569.952916] Hardware name: Dell Inc. PowerEdge R750/0WMWCR, BIOS 1.2.4 05/28/2021\n[ 8569.952917] RIP: 0010:prepare_to_wait_event+0x101/0x190\n  :\n[ 8569.952940] Call Trace:\n[ 8569.952941]  \u003cTASK\u003e\n[ 8569.952944]  ref_scale_reader+0x380/0x4a0 [refscale]\n[ 8569.952959]  kthread+0x10e/0x130\n[ 8569.952966]  ret_from_fork+0x1f/0x30\n[ 8569.952973]  \u003c/TASK\u003e\n\nThe likely cause is that init_waitqueue_head() is called after the call to\nthe torture_create_kthread() function that creates the ref_scale_reader\nkthread.  Although this init_waitqueue_head() call will very likely\ncomplete before this kthread is created and starts running, it is\npossible that the calling kthread will be delayed between the calls to\ntorture_create_kthread() and init_waitqueue_head().  In this case, the\nnew kthread will use the waitqueue head before it is properly initialized,\nwhich is not good for the kernel\u0027s health and well-being.\n\nThe above crash happened here:\n\n\tstatic inline void __add_wait_queue(...)\n\t{\n\t\t:\n\t\tif (!(wq-\u003eflags \u0026 WQ_FLAG_PRIORITY)) \u003c=== Crash here\n\nThe offset of flags from list_head entry in wait_queue_entry is\n-0x18. If reader_tasks[i].wq.head.next is NULL as allocated reader_task\nstructure is zero initialized, the instruction will try to access address\n0xffffffffffffffe8, which is exactly the fault address listed above.\n\nThis commit therefore invokes init_waitqueue_head() before creating\nthe kthread."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-12-30T12:23:46.526Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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      "references": [
        {
          "url": "https://git.kernel.org/stable/c/066fbd8bc981cf49923bf828b7b4092894df577f"
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        {
          "url": "https://git.kernel.org/stable/c/ec9d118ad99dc6f1bc674c1e649c25533d89b9ba"
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          "url": "https://git.kernel.org/stable/c/e0322a255a2242dbe4686b6176b3c83dea490529"
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          "url": "https://git.kernel.org/stable/c/e5de968a9032366198720eac4f368ed7e690b3ef"
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        {
          "url": "https://git.kernel.org/stable/c/70a2856fd1d0a040c876ba9e3f89b949ae92e4dd"
        },
        {
          "url": "https://git.kernel.org/stable/c/f5063e8948dad7f31adb007284a5d5038ae31bb8"
        }
      ],
      "title": "refscale: Fix uninitalized use of wait_queue_head_t",
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2023-54316",
    "datePublished": "2025-12-30T12:23:46.526Z",
    "dateReserved": "2025-12-30T12:06:44.531Z",
    "dateUpdated": "2025-12-30T12:23:46.526Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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