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CVE-2022-49077· NVD / CVE Program· CNA Linux

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

Noroxi assessment

Priority: Monitor (action score 22/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.25% (FIRST EPSS).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Linux Linux 01e67e04c28170c47700c2c226d732bbfedb1ad0, 04bc13dae4a27b8d030843c85ae452bb2f1d9c1f, 2358aa84ef6dafcf544a557caaa6b91afb4a0bd2.

Low priority for now. Upgrade to Linux Linux 01e67e04c28170c47700c2c226d732bbfedb1ad0, 04bc13dae4a27b8d030843c85ae452bb2f1d9c1f, 2358aa84ef6dafcf544a557caaa6b91afb4a0bd2 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
Feb 26, 2025
Updated
Jun 17, 2026
EPSS
0.2% · 15th percentile

Report tools

JSON

Action score

22

Monitor

Low priority for now.

CVSS
22 / 40 · 5.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

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When you'll hear from us

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  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
linuxlinux kernel

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • linux linux kernelbefore 4.9.311
  • linux linux kernel4.10 and later · before 4.14.276
  • linux linux kernel4.15 and later · before 4.19.238
  • linux linux kernel4.20 and later · before 5.4.189
  • linux linux kernel5.5 and later · before 5.10.111
  • linux linux kernel5.11 and later · before 5.15.34
  • linux linux kernel5.16 and later · before 5.16.20
  • linux linux kernel5.17 and later · before 5.17.3
  • linux linux kernel5.18

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 3.2affected
    • 7b6efc2bc4f19952b25ebf9b236e5ac43cd386c2 and later · before a05540f3903bd8295e8c4cd90dd3d416239a115baffected · git
    • 7b6efc2bc4f19952b25ebf9b236e5ac43cd386c2 and later · before eeaf28e2a0128147d687237e59d5407ee1b14693affected · git
    • 7b6efc2bc4f19952b25ebf9b236e5ac43cd386c2 and later · before e2c328c2a8f9de8b761bd4025b66c63120c55761affected · git
    • 7b6efc2bc4f19952b25ebf9b236e5ac43cd386c2 and later · before c19d8de4e682ec4b0ea2b04a832cd8cc0be3bb31affected · git
    • 7b6efc2bc4f19952b25ebf9b236e5ac43cd386c2 and later · before 7d659cb1763ff17d1c6ee082fa6feb4267c7a30baffected · git
    • 7b6efc2bc4f19952b25ebf9b236e5ac43cd386c2 and later · before a04cb99c5d4668fe3f5c0e5b6da1cecd34c3f219affected · git
    • 7b6efc2bc4f19952b25ebf9b236e5ac43cd386c2 and later · before 2358aa84ef6dafcf544a557caaa6b91afb4a0bd2affected · git
    • 7b6efc2bc4f19952b25ebf9b236e5ac43cd386c2 and later · before 04bc13dae4a27b8d030843c85ae452bb2f1d9c1faffected · git
    • 7b6efc2bc4f19952b25ebf9b236e5ac43cd386c2 and later · before 01e67e04c28170c47700c2c226d732bbfedb1ad0affected · git

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 5.17.3-15.17.3-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe KEV
    89Now
  • CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV
    85Now
  • CVE-2016-5195Race condition in mm/gup.c in the Linux kernel 2.x through 4.x before 4.8.3 allows local users to gain privileges by leveraging incorrect haKEV
    83Now
  • CVE-2019-13272In the Linux kernel before 5.1.17, ptrace_link in kernel/ptrace.c mishandles the recording of the credentials of a process that wants to creKEV
    77This week
  • CVE-2013-6282The (1) get_user and (2) put_user API functions in the Linux kernel before 3.5.5 on the v6k and v7 ARM platforms do not validate certain addKEV
    77This week
  • CVE-2013-2094The perf_swevent_init function in kernel/events/core.c in the Linux kernel before 3.8.9 uses an incorrect integer data type, which allows loKEV
    77This week

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux01e67e04c28170c47700c2c226d732bbfedb1ad0Vendor (CNA)
Linux Linux04bc13dae4a27b8d030843c85ae452bb2f1d9c1fVendor (CNA)
Linux Linux2358aa84ef6dafcf544a557caaa6b91afb4a0bd2Vendor (CNA)
Linux Linux7d659cb1763ff17d1c6ee082fa6feb4267c7a30bVendor (CNA)
Linux Linuxa04cb99c5d4668fe3f5c0e5b6da1cecd34c3f219Vendor (CNA)
Linux Linuxa05540f3903bd8295e8c4cd90dd3d416239a115bVendor (CNA)
Linux Linuxc19d8de4e682ec4b0ea2b04a832cd8cc0be3bb31Vendor (CNA)
Linux Linuxe2c328c2a8f9de8b761bd4025b66c63120c55761Vendor (CNA)
Linux Linuxeeaf28e2a0128147d687237e59d5407ee1b14693Vendor (CNA)
debian:linux5.17.3-1 · Debian:12Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2026-53088483 days apartnet: bcmgenet: fix off-by-one in bcmgenet_put_txcb
    39Monitor
  • CVE-2026-53309485 days apartocfs2/dlm: fix off-by-one in dlm_match_regions() region comparison
    39Monitor
  • CVE-2026-64047508 days apartnet: tls: fix off-by-one in sg_chain entry count for wrapped sk_msg ring
    39Monitor
  • CVE-2024-579900 days apartwifi: mt76: mt7925: fix off by one in mt7925_load_clc()
    31Monitor
  • CVE-2024-47682128 days apartscsi: sd: Fix off-by-one error in sd_read_block_characteristics()
    31Monitor
  • CVE-2024-49880128 days apartext4: fix off by one issue in alloc_flex_gd()
    31Monitor

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

CWE-193 · Off-by-one Error

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (8 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records