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CVE PROGRAM SOURCE RECORDUnscored

CVE-2022-49726

clocksource: hyper-v: unexport __init-annotated hv_init_clocksource()

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Status
Published
Published
Updated
Assigning organization
Linux

Description

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)

Affected products

Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.

Linux Linux

Default version status: unaffected

  • dd2cb348613b44f9d948b068775e159aad298599 to < cff3a7ce6e81418b6e8bac941779bbf5d342d626affected
  • dd2cb348613b44f9d948b068775e159aad298599 to < db965e2757d95f695e606856418cd84003dd036daffected
  • dd2cb348613b44f9d948b068775e159aad298599 to < 0414eab7c78f3518143d383e448d44fc573ac6d2affected
  • dd2cb348613b44f9d948b068775e159aad298599 to < 937fcbb55a1e48a6422e87e8f49422c92265f102affected
  • dd2cb348613b44f9d948b068775e159aad298599 to < 245b993d8f6c4e25f19191edfbd8080b645e12b1affected

Linux Linux

Default version status: affected

  • 5.3affected
  • 0 to < 5.3unaffected
  • 5.4.200 to ≤ 5.4.*unaffected
  • 5.10.124 to ≤ 5.10.*unaffected
  • 5.15.49 to ≤ 5.15.*unaffected
  • 5.18.6 to ≤ 5.18.*unaffected
  • 5.19 to ≤ *unaffected

References