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

Vulnerability from cvelistv5 – Published: 2025-02-26 02:24 – Updated: 2026-05-11 19:05
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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{
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          "programFiles": [
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          "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)"
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  }
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

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Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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