CVE-2022-49989

MEDIUM EPSS 9.6%
Published Jun 18, 20251y ago · Modified Jun 17, 20261w ago
5.5 CVSS 3.1
Medium
Find Similar
Published Jun 18, 2025 1y ago
Last Modified Jun 17, 2026 1w ago

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.

CVSS Details

Base Score
5.5
Exploitability
1.8
Impact
3.6
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
9.6% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-476 NULL Pointer Dereference Memory Safety

Affected Products 5

VendorProductVersionRange
linuxlinux_kernel*≥4.11  –  <5.10.140
linuxlinux_kernel*≥5.11  –  <5.15.64
linuxlinux_kernel*≥5.16  –  <5.19.6
linuxlinux_kernel6.0any
linuxlinux_kernel6.0any

References 4

  • git.kernel.org https://git.kernel.org/stable/c/45d47bd9b96e7874b98dbcc7602fe2826c5d62a6
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/6de50db104af0dc921f593fd95c55db86a52ceef
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/c2b7bae7c90051fd6a679d5dee00400d67ebbf4a
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/c5deb27895e017a0267de0a20d140ad5fcc55a54
    Patch

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/45d47bd9b96e7874b98dbcc7602fe2826c5d62a6
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/6de50db104af0dc921f593fd95c55db86a52ceef
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/c2b7bae7c90051fd6a679d5dee00400d67ebbf4a
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/c5deb27895e017a0267de0a20d140ad5fcc55a54
    Patch