CVE-2022-49004

Kernel panic via stale EFI page-table mappings

Published Oct 21, 2024 · Updated May 11, 2026

A page-table synchronization flaw in Linux allows local users to trigger a kernel panic during RISC-V EFI runtime calls. The EFI page table copies kernel mappings too early and can omit a newly allocated vmalloc stack PGD before the kernel switches page tables. Exploitation requires a RISC-V system with EFI and VMAP_STACK where the active kernel stack occupies an unsynchronized PGD, causing a trap and system-wide service interruption.

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

A page-table synchronization flaw in Linux allows local users to trigger a kernel panic during RISC-V EFI runtime calls. The EFI page table copies kernel mappings too early and can omit a newly allocated vmalloc stack PGD before the kernel switches page tables. Exploitation requires a RISC-V system with EFI and VMAP_STACK where the active kernel stack occupies an unsynchronized PGD, causing a trap and system-wide service interruption.

The record

CVE
CVE-2022-49004
Published
Oct 21, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 21, 2024CVE 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=5.10
  2. Affected versionversion=b91540d52a08b65eb6a2b09132e1bd54fa82754c <3f105a742725a1b78766a55169f1d827732e62b8
  3. Affected versionversion=b91540d52a08b65eb6a2b09132e1bd54fa82754c <96f479383d92944406d4b3f2bc03c2f640def9f1
  4. Affected versionversion=b91540d52a08b65eb6a2b09132e1bd54fa82754c <fa7a7d185ef380546b4b1fed6f84f31dbae8cec7

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.10; version=b91540d52a08b65eb6a2b09132e1bd54fa82754c <3f105a742725a1b78766a55169f1d827732e62b8; version=b91540d52a08b65eb6a2b09132e1bd54fa82754c <96f479383d92944406d4b3f2bc03c2f640def9f1; version=b91540d52a08b65eb6a2b09132e1bd54fa82754c <fa7a7d185ef380546b4b1fed6f84f31dbae8cec7

Published CVSS scores

5.5NIST NVDCVSS: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

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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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

T1499.004Endpoint Denial of Service: Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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