CVE-2022-49989
xen/privcmd: fix error exit of privcmd_ioctl_dm_op()
- Published
- Updated
- Reserved
- Assigned by
- Linux
Description
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.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Analyzed | 3.1 | Medium5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.25% · top 83% of all CVEs (7 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.5.
Weakness
Affected products
- affected ab520be8cd5d56867fc95cfbc34b90880faf1f9d – < 6de50db104af0dc921f593fd95c55db86a52ceef
- affected ab520be8cd5d56867fc95cfbc34b90880faf1f9d – < c2b7bae7c90051fd6a679d5dee00400d67ebbf4a
- affected ab520be8cd5d56867fc95cfbc34b90880faf1f9d – < 45d47bd9b96e7874b98dbcc7602fe2826c5d62a6
- affected ab520be8cd5d56867fc95cfbc34b90880faf1f9d – < c5deb27895e017a0267de0a20d140ad5fcc55a54
- affected 4.11
- unaffected < 4.11
- unaffected 5.10.140 – ≤ 5.10.*
- unaffected 5.15.64 – ≤ 5.15.*
- unaffected 5.19.6 – ≤ 5.19.*
- unaffected 6.0 – ≤ *
References (4)
- https://git.kernel.org/stable/c/6de50db104af0dc921f593fd95c55db86a52ceef (opens in a new tab)
- https://git.kernel.org/stable/c/c2b7bae7c90051fd6a679d5dee00400d67ebbf4a (opens in a new tab)
- https://git.kernel.org/stable/c/45d47bd9b96e7874b98dbcc7602fe2826c5d62a6 (opens in a new tab)
- https://git.kernel.org/stable/c/c5deb27895e017a0267de0a20d140ad5fcc55a54 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://trackcve.app/cve/CVE-2022-49989)Record last updated .