# CVE-2022-49989: linux: In the Linux kernel, the following vulnerability has been resolved:  xen/privcmd: fix error exit of privcmd_ioctl_dm_...

CVE-2022-49989 is fixed in linux on 1 platform, first by DEBIAN-CVE-2022-49989, released June 18, 2025. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2022-49989
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0025
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jun 18, 2025

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 6.0.2-1 | [DEBIAN-CVE-2022-49989](https://patchblox.com/security/data/fix/linux/debian-cve-2022-49989.md) | Jun 18, 2025 |
| Linux | linux Debian 13.5 (trixie) | 6.0.2-1 | [DEBIAN-CVE-2022-49989](https://patchblox.com/security/data/fix/linux/debian-cve-2022-49989.md) | Jun 18, 2025 |
| Linux | linux Debian 14 | 6.0.2-1 | [DEBIAN-CVE-2022-49989](https://patchblox.com/security/data/fix/linux/debian-cve-2022-49989.md) | Jun 18, 2025 |

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