mmmremap.c: avoid pointless invalidate_range_start/end on mremap(old_size=0) (CVE-2022-49077)

Why this deserves its current priority

CVSS is 5.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Affected products and reported versions
Product	Affected versions	Fixed versions
cpe:2.3:o:linux:linux_kernel::::::::	Not reported	Not reported
cpe:2.3:o:linux:linux_kernel:5.18:rc1::::::	Not reported	Not reported

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Linux/Linuxgeneric	>=7b6efc2bc4f19952b25ebf9b236e5ac43cd386c2 <a05540f3903bd8295e8c4cd90dd3d416239a115b \|\| >=7b6efc2bc4f19952b25ebf9b236e5ac43cd386c2 <eeaf28e2a0128147d687237e59d5407ee1b14693 \|\| >=7b6efc2bc4f19952b25ebf9b236e5ac43cd386c2 <e2c328c2a8f9de8b761bd4025b66c63120c55761 \|\| >=7b6efc2bc4f19952b25ebf9b236e5ac43cd386c2 <c19d8de4e682ec4b0ea2b04a832cd8cc0be3bb31 \|\| >=7b6efc2bc4f19952b25ebf9b236e5ac43cd386c2 <7d659cb1763ff17d1c6ee082fa6feb4267c7a30b \|\| >=7b6efc2bc4f19952b25ebf9b236e5ac43cd386c2 <a04cb99c5d4668fe3f5c0e5b6da1cecd34c3f219 \|\| >=7b6efc2bc4f19952b25ebf9b236e5ac43cd386c2 <2358aa84ef6dafcf544a557caaa6b91afb4a0bd2 \|\| >=7b6efc2bc4f19952b25ebf9b236e5ac43cd386c2 <04bc13dae4a27b8d030843c85ae452bb2f1d9c1f \|\| >=7b6efc2bc4f19952b25ebf9b236e5ac43cd386c2 <01e67e04c28170c47700c2c226d732bbfedb1ad0	a05540f3903bd8295e8c4cd90dd3d416239a115b, eeaf28e2a0128147d687237e59d5407ee1b14693, e2c328c2a8f9de8b761bd4025b66c63120c55761, c19d8de4e682ec4b0ea2b04a832cd8cc0be3bb31, 7d659cb1763ff17d1c6ee082fa6feb4267c7a30b, a04cb99c5d4668fe3f5c0e5b6da1cecd34c3f219, 2358aa84ef6dafcf544a557caaa6b91afb4a0bd2, 04bc13dae4a27b8d030843c85ae452bb2f1d9c1f, 01e67e04c28170c47700c2c226d732bbfedb1ad0
Linux/Linuxgeneric	3.2	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to a05540f3903bd8295e8c4cd90dd3d416239a115b if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Feb 26, 2025
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Nov 5, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Nov 5, 2026

Sources and claim methodology

Upstream source 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.

Quoted source text, attributed separately from HOL analysis.

mmmremap.c: avoid pointless invalidate_range_start/end on mremap(old_size=0)CVE-2022-49077