# CVE-2022-49077: linux: In the Linux kernel, the following vulnerability has been resolved:  mmmremap.c: avoid pointless invalidate_range_sta...

CVE-2022-49077 is fixed in linux on 1 platform, first by DEBIAN-CVE-2022-49077, released February 26, 2025. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2022-49077
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0025
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Feb 26, 2025

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 5.17.3-1 | [DEBIAN-CVE-2022-49077](https://patchblox.com/security/data/fix/linux/debian-cve-2022-49077.md) | Feb 26, 2025 |
| Linux | linux Debian 13.5 (trixie) | 5.17.3-1 | [DEBIAN-CVE-2022-49077](https://patchblox.com/security/data/fix/linux/debian-cve-2022-49077.md) | Feb 26, 2025 |
| Linux | linux Debian 14 | 5.17.3-1 | [DEBIAN-CVE-2022-49077](https://patchblox.com/security/data/fix/linux/debian-cve-2022-49077.md) | Feb 26, 2025 |

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Data as of 2026-11-08T19:12:23Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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