CVE-2022-49726 (GCVE-0-2022-49726)

Vulnerability from cvelistv5 – Published: 2025-02-26 02:24 – Updated: 2025-05-04 08:44
VLAI?
Title
clocksource: hyper-v: unexport __init-annotated hv_init_clocksource()
Summary
In the Linux kernel, the following vulnerability has been resolved: clocksource: hyper-v: unexport __init-annotated hv_init_clocksource() EXPORT_SYMBOL and __init is a bad combination because the .init.text section is freed up after the initialization. Hence, modules cannot use symbols annotated __init. The access to a freed symbol may end up with kernel panic. modpost used to detect it, but it has been broken for a decade. Recently, I fixed modpost so it started to warn it again, then this showed up in linux-next builds. There are two ways to fix it: - Remove __init - Remove EXPORT_SYMBOL I chose the latter for this case because the only in-tree call-site, arch/x86/kernel/cpu/mshyperv.c is never compiled as modular. (CONFIG_HYPERVISOR_GUEST is boolean)
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: dd2cb348613b44f9d948b068775e159aad298599 , < cff3a7ce6e81418b6e8bac941779bbf5d342d626 (git)
Affected: dd2cb348613b44f9d948b068775e159aad298599 , < db965e2757d95f695e606856418cd84003dd036d (git)
Affected: dd2cb348613b44f9d948b068775e159aad298599 , < 0414eab7c78f3518143d383e448d44fc573ac6d2 (git)
Affected: dd2cb348613b44f9d948b068775e159aad298599 , < 937fcbb55a1e48a6422e87e8f49422c92265f102 (git)
Affected: dd2cb348613b44f9d948b068775e159aad298599 , < 245b993d8f6c4e25f19191edfbd8080b645e12b1 (git)
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    Linux Linux Affected: 5.3
Unaffected: 0 , < 5.3 (semver)
Unaffected: 5.4.200 , ≤ 5.4.* (semver)
Unaffected: 5.10.124 , ≤ 5.10.* (semver)
Unaffected: 5.15.49 , ≤ 5.15.* (semver)
Unaffected: 5.18.6 , ≤ 5.18.* (semver)
Unaffected: 5.19 , ≤ * (original_commit_for_fix)
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{
  "containers": {
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      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/clocksource/hyperv_timer.c"
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              "status": "unaffected",
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              "status": "unaffected",
              "version": "5.18.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "5.19",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
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              "cpeMatch": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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              "operator": "OR"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nclocksource: hyper-v: unexport __init-annotated hv_init_clocksource()\n\nEXPORT_SYMBOL and __init is a bad combination because the .init.text\nsection is freed up after the initialization. Hence, modules cannot\nuse symbols annotated __init. The access to a freed symbol may end up\nwith kernel panic.\n\nmodpost used to detect it, but it has been broken for a decade.\n\nRecently, I fixed modpost so it started to warn it again, then this\nshowed up in linux-next builds.\n\nThere are two ways to fix it:\n\n  - Remove __init\n  - Remove EXPORT_SYMBOL\n\nI chose the latter for this case because the only in-tree call-site,\narch/x86/kernel/cpu/mshyperv.c is never compiled as modular.\n(CONFIG_HYPERVISOR_GUEST is boolean)"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-05-04T08:44:10.038Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/cff3a7ce6e81418b6e8bac941779bbf5d342d626"
        },
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          "url": "https://git.kernel.org/stable/c/db965e2757d95f695e606856418cd84003dd036d"
        },
        {
          "url": "https://git.kernel.org/stable/c/0414eab7c78f3518143d383e448d44fc573ac6d2"
        },
        {
          "url": "https://git.kernel.org/stable/c/937fcbb55a1e48a6422e87e8f49422c92265f102"
        },
        {
          "url": "https://git.kernel.org/stable/c/245b993d8f6c4e25f19191edfbd8080b645e12b1"
        }
      ],
      "title": "clocksource: hyper-v: unexport __init-annotated hv_init_clocksource()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2022-49726",
    "datePublished": "2025-02-26T02:24:38.003Z",
    "dateReserved": "2025-02-26T02:21:30.448Z",
    "dateUpdated": "2025-05-04T08:44:10.038Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1"
}


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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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