CVE-2022-49357

EFI runtime service loss via firmware variable reads

Published Feb 26, 2025 · Updated May 11, 2026

Denial of service in affected Linux 5.x branches disables EFI runtime services during early boot on Apple T2 Macs. The platform certificate loader reads the UEFI db and dbx variables without excluding affected Apple models, causing Apple firmware to page-fault. The failure requires Linux to boot on T2 hardware and prevents subsequent EFI runtime calls and Secure Boot certificate-list loading.

CVSS severity5.5
Medium
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in affected Linux 5.x branches disables EFI runtime services during early boot on Apple T2 Macs. The platform certificate loader reads the UEFI db and dbx variables without excluding affected Apple models, causing Apple firmware to page-fault. The failure requires Linux to boot on T2 hardware and prevents subsequent EFI runtime calls and Secure Boot certificate-list loading.

The record

CVE
CVE-2022-49357
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

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=15ea0e1e3e185040bed6119f815096f2e4326242 <155ca952c7ca19aa32ecfb7373a32bbc2e1ec6eb
  2. Affected versionversion=15ea0e1e3e185040bed6119f815096f2e4326242 <1f7264f0510f519b4e4f575a8f0579ea65e7592e
  3. Affected versionversion=15ea0e1e3e185040bed6119f815096f2e4326242 <65237307f88f5200782ae7f243bdd385e37cde5d
  4. Affected versionversion=15ea0e1e3e185040bed6119f815096f2e4326242 <b1cda6dd2c44771f042d65f0d17bec322ef99a0a
  5. Affected versionversion=15ea0e1e3e185040bed6119f815096f2e4326242 <b34786b25d75f9c119696e6bdf3827f54ae3601b
  6. Affected versionversion=15ea0e1e3e185040bed6119f815096f2e4326242 <c072cab98bac11f6ef9db640fb51834d9552e2e6
  7. Affected versionversion=5.0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=15ea0e1e3e185040bed6119f815096f2e4326242 <155ca952c7ca19aa32ecfb7373a32bbc2e1ec6eb; version=15ea0e1e3e185040bed6119f815096f2e4326242 <1f7264f0510f519b4e4f575a8f0579ea65e7592e; version=15ea0e1e3e185040bed6119f815096f2e4326242 <65237307f88f5200782ae7f243bdd385e37cde5d; version=15ea0e1e3e185040bed6119f815096f2e4326242 <b1cda6dd2c44771f042d65f0d17bec322ef99a0a; version=15ea0e1e3e185040bed6119f815096f2e4326242 <b34786b25d75f9c119696e6bdf3827f54ae3601b; version=15ea0e1e3e185040bed6119f815096f2e4326242 <c072cab98bac11f6ef9db640fb51834d9552e2e6; version=5.0

Published CVSS scores

6.1Oracle LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:H
5.5UbuntuCVSS: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

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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