CVE-2022-49081

Local runtime warnings via false PTE checks

Published Feb 26, 2025 · Updated May 11, 2026

Improper PTE validation in affected Linux kernel revisions allows local users to trigger highmem scheduler runtime warnings. The __kmap_local_sched_in and __kmap_local_sched_out checks apply pte_none to zero-initialized tsk->kmap_ctrl.pteval slots even though a zero PTE is not pte_none on every architecture. Exposure requires CONFIG_DEBUG_KMAP_LOCAL and an architecture such as Xtensa with this PTE behavior; the documented consequence is repeated kernel warnings during scheduling.

CVSS severity5.5
Medium
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper PTE validation in affected Linux kernel revisions allows local users to trigger highmem scheduler runtime warnings. The __kmap_local_sched_in and __kmap_local_sched_out checks apply pte_none to zero-initialized tsk->kmap_ctrl.pteval slots even though a zero PTE is not pte_none on every architecture. Exposure requires CONFIG_DEBUG_KMAP_LOCAL and an architecture such as Xtensa with this PTE behavior; the documented consequence is repeated kernel warnings during scheduling.

The record

CVE
CVE-2022-49081
Published
Feb 26, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 26, 2025CVE publishedPublication date reported by the CVE source.
  2. May 11, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=5.11
  2. Affected versionversion=5fbda3ecd14a5343644979c98d6eb65b7e7de9d8 <66f133ceab7456c789f70a242991ed1b27ba1c3d
  3. Affected versionversion=5fbda3ecd14a5343644979c98d6eb65b7e7de9d8 <7dd5b3b97716a611fcf67d92fd2370fcb8d50372
  4. Affected versionversion=5fbda3ecd14a5343644979c98d6eb65b7e7de9d8 <85550b0f5fa5dd3c30469ea702c44444ef242c83
  5. Affected versionversion=5fbda3ecd14a5343644979c98d6eb65b7e7de9d8 <c21d040de6225414547d9bd31cd200f290991c85

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.11; version=5fbda3ecd14a5343644979c98d6eb65b7e7de9d8 <66f133ceab7456c789f70a242991ed1b27ba1c3d; version=5fbda3ecd14a5343644979c98d6eb65b7e7de9d8 <7dd5b3b97716a611fcf67d92fd2370fcb8d50372; version=5fbda3ecd14a5343644979c98d6eb65b7e7de9d8 <85550b0f5fa5dd3c30469ea702c44444ef242c83; version=5fbda3ecd14a5343644979c98d6eb65b7e7de9d8 <c21d040de6225414547d9bd31cd200f290991c85

Published CVSS scores

5.5CanonicalCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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