CVE-2022-49989None▾ SunlitIn 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 …
▾ Sunlit zone — Low / medium · no exploitation signal
impact 2.8 · likelihood 0.1 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake.
Exploit-prediction probability, daily snapshots since Nov 5.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.3%
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.
Linux >= ab520be8cd5d56867fc95cfbc34b90880faf1f9d < 6de50db104af0dc921f593fd95c55db86a52ceefLinux >= ab520be8cd5d56867fc95cfbc34b90880faf1f9d < c2b7bae7c90051fd6a679d5dee00400d67ebbf4aLinux >= ab520be8cd5d56867fc95cfbc34b90880faf1f9d < 45d47bd9b96e7874b98dbcc7602fe2826c5d62a6Linux >= ab520be8cd5d56867fc95cfbc34b90880faf1f9d < c5deb27895e017a0267de0a20d140ad5fcc55a54Linux 4.11Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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