CVE-2022-49077

MEDIUM EPSS 13.9%
Published Feb 26, 20251y ago · Modified Jun 17, 20262w ago
5.5 CVSS 3.1
Medium
Find Similar
Published Feb 26, 2025 1y ago
Last Modified Jun 17, 2026 2w ago

Description

In the Linux kernel, the following vulnerability has been resolved: mmmremap.c: avoid pointless invalidate_range_start/end on mremap(old_size=0) If an mremap() syscall with old_size=0 ends up in move_page_tables(), it will call invalidate_range_start()/invalidate_range_end() unnecessarily, i.e. with an empty range. This causes a WARN in KVM's mmu_notifier. In the past, empty ranges have been diagnosed to be off-by-one bugs, hence the WARNing. Given the low (so far) number of unique reports, the benefits of detecting more buggy callers seem to outweigh the cost of having to fix cases such as this one, where userspace is doing something silly. In this particular case, an early return from move_page_tables() is enough to fix the issue.

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
13.9% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-193

Affected Products 9

VendorProductVersionRange
linuxlinux_kernel* <4.9.311
linuxlinux_kernel*≥4.10  –  <4.14.276
linuxlinux_kernel*≥4.15  –  <4.19.238
linuxlinux_kernel*≥4.20  –  <5.4.189
linuxlinux_kernel*≥5.5  –  <5.10.111
linuxlinux_kernel*≥5.11  –  <5.15.34
linuxlinux_kernel*≥5.16  –  <5.16.20
linuxlinux_kernel*≥5.17  –  <5.17.3
linuxlinux_kernel5.18any

References 9

  • git.kernel.org https://git.kernel.org/stable/c/01e67e04c28170c47700c2c226d732bbfedb1ad0
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/04bc13dae4a27b8d030843c85ae452bb2f1d9c1f
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/2358aa84ef6dafcf544a557caaa6b91afb4a0bd2
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/7d659cb1763ff17d1c6ee082fa6feb4267c7a30b
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/a04cb99c5d4668fe3f5c0e5b6da1cecd34c3f219
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/a05540f3903bd8295e8c4cd90dd3d416239a115b
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/c19d8de4e682ec4b0ea2b04a832cd8cc0be3bb31
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/e2c328c2a8f9de8b761bd4025b66c63120c55761
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/eeaf28e2a0128147d687237e59d5407ee1b14693
    Patch

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/01e67e04c28170c47700c2c226d732bbfedb1ad0
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/04bc13dae4a27b8d030843c85ae452bb2f1d9c1f
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/2358aa84ef6dafcf544a557caaa6b91afb4a0bd2
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/7d659cb1763ff17d1c6ee082fa6feb4267c7a30b
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/a04cb99c5d4668fe3f5c0e5b6da1cecd34c3f219
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/a05540f3903bd8295e8c4cd90dd3d416239a115b
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/c19d8de4e682ec4b0ea2b04a832cd8cc0be3bb31
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/e2c328c2a8f9de8b761bd4025b66c63120c55761
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/eeaf28e2a0128147d687237e59d5407ee1b14693
    Patch