CVE-2022-49077
Last modified
CVE-2022-49077 is a medium-severity vulnerability rated 5.5/10 on the CVSS scale. 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. EPSS estimates a 0.23% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness Enumeration
Affected Software
| Vendor | Product | Versions | Update |
|---|---|---|---|
| Linux | Linux Kernel | < 4.9.311 | — |
| Linux | Linux Kernel | >= 4.10, < 4.14.276 | — |
| Linux | Linux Kernel | >= 4.15, < 4.19.238 | — |
| Linux | Linux Kernel | >= 4.20, < 5.4.189 | — |
| Linux | Linux Kernel | >= 5.5, < 5.10.111 | — |
| Linux | Linux Kernel | >= 5.11, < 5.15.34 | — |
| Linux | Linux Kernel | >= 5.16, < 5.16.20 | — |
| Linux | Linux Kernel | >= 5.17, < 5.17.3 | — |
| Linux | Linux Kernel | 5.18 | Rc1 |
References
Timeline
- Published
- Last Modified
- Status
- Analyzed
Frequently Asked Questions
What is CVE-2022-49077?
How severe is CVE-2022-49077?
How do I fix CVE-2022-49077?
How Strix Helps
- How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
- Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
- PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
- AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.
Related CVEs from 2022
- CVE-2022-49071In the Linux kernel, the following vulnerability has been re…5.5
- CVE-2022-49072In the Linux kernel, the following vulnerability has been re…5.5
- CVE-2022-49073In the Linux kernel, the following vulnerability has been re…7.8
- CVE-2022-49074In the Linux kernel, the following vulnerability has been re…5.5
- CVE-2022-49075In the Linux kernel, the following vulnerability has been re…5.5
- CVE-2022-49076In the Linux kernel, the following vulnerability has been re…7.8
- CVE-2022-49078In the Linux kernel, the following vulnerability has been re…7.8
- CVE-2022-49079In the Linux kernel, the following vulnerability has been re…5.5
- CVE-2022-4908Inappropriate implementation in iFrame Sandbox in Google Chr…4.3
- CVE-2022-49080In the Linux kernel, the following vulnerability has been re…5.5
- CVE-2022-49081In the Linux kernel, the following vulnerability has been re…5.5
- CVE-2022-49082In the Linux kernel, the following vulnerability has been re…7.8
Are you affected by CVE-2022-49077?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST