CVE-2022-49989 (GCVE-0-2022-49989)

Vulnerability from cvelistv5 – Published: 2025-06-18 11:00 – Updated: 2025-06-18 11:00
VLAI?
Summary
In the Linux kernel, the following vulnerability has been resolved: xen/privcmd: fix error exit of privcmd_ioctl_dm_op() The error exit of privcmd_ioctl_dm_op() is calling unlock_pages() potentially with pages being NULL, leading to a NULL dereference. Additionally lock_pages() doesn't check for pin_user_pages_fast() having been completely successful, resulting in potentially not locking all pages into memory. This could result in sporadic failures when using the related memory in user mode. Fix all of that by calling unlock_pages() always with the real number of pinned pages, which will be zero in case pages being NULL, and by checking the number of pages pinned by pin_user_pages_fast() matching the expected number of pages.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: ab520be8cd5d56867fc95cfbc34b90880faf1f9d , < 6de50db104af0dc921f593fd95c55db86a52ceef (git)
Affected: ab520be8cd5d56867fc95cfbc34b90880faf1f9d , < c2b7bae7c90051fd6a679d5dee00400d67ebbf4a (git)
Affected: ab520be8cd5d56867fc95cfbc34b90880faf1f9d , < 45d47bd9b96e7874b98dbcc7602fe2826c5d62a6 (git)
Affected: ab520be8cd5d56867fc95cfbc34b90880faf1f9d , < c5deb27895e017a0267de0a20d140ad5fcc55a54 (git)
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    Linux Linux Affected: 4.11
Unaffected: 0 , < 4.11 (semver)
Unaffected: 5.10.140 , ≤ 5.10.* (semver)
Unaffected: 5.15.64 , ≤ 5.15.* (semver)
Unaffected: 5.19.6 , ≤ 5.19.* (semver)
Unaffected: 6.0 , ≤ * (original_commit_for_fix)
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}


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  • 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.
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Detection rules are retrieved from Rulezet.