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CVE-2022-49077

5.5 · MEDIUM

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…

Published Feb 26, 2025CWE-193EPSS 0.25%

Overview

CVE-2022-49077 is a medium-severity vulnerability. It was published on February 26, 2025 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

Technical 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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/01e67e04c28170c47700c2c226d732bbfedb1ad0Refgit.kernel.org/stable/c/04bc13dae4a27b8d030843c85ae452bb2f1d9c1fRefgit.kernel.org/stable/c/2358aa84ef6dafcf544a557caaa6b91afb4a0bd2Refgit.kernel.org/stable/c/7d659cb1763ff17d1c6ee082fa6feb4267c7a30bRefgit.kernel.org/stable/c/a04cb99c5d4668fe3f5c0e5b6da1cecd34c3f219Refgit.kernel.org/stable/c/a05540f3903bd8295e8c4cd90dd3d416239a115bRefgit.kernel.org/stable/c/c19d8de4e682ec4b0ea2b04a832cd8cc0be3bb31Refgit.kernel.org/stable/c/e2c328c2a8f9de8b761bd4025b66c63120c55761Refgit.kernel.org/stable/c/eeaf28e2a0128147d687237e59d5407ee1b14693

How CyberStrike helps

Frequently asked questions

What is CVE-2022-49077?

CVE-2022-49077 is a medium-severity vulnerability. It was published on February 26, 2025 and has a CVSS 3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2022-49077?

This vulnerability has a CVSS 3.1 base score of 5.5, rated MEDIUM. It requires local or adjacent network access to exploit. Some level of privileges is required for exploitation.

How do I fix or remediate CVE-2022-49077?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2022-49077?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2022-49077 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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