CVE-2022-48634

Graphics disruption via spinlock-held mutex acquisition

Published Apr 28, 2024 · Updated May 11, 2026

Improper locking in the Linux kernel gma500 driver allows local users to disrupt graphics operations through a page-flip ioctl. gma_crtc_page_flip() keeps event_lock, a spinlock, held while mode_set_base() acquires a sleeping ww_mutex, placing a sleep operation in atomic context. Reachability requires local low-privilege access and an active gma500 graphics stack; the documented result is an invalid-context kernel warning, not demonstrated code execution.

CVSS severity5.3
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

Improper locking in the Linux kernel gma500 driver allows local users to disrupt graphics operations through a page-flip ioctl. gma_crtc_page_flip() keeps event_lock, a spinlock, held while mode_set_base() acquires a sleeping ww_mutex, placing a sleep operation in atomic context. Reachability requires local low-privilege access and an active gma500 graphics stack; the documented result is an invalid-context kernel warning, not demonstrated code execution.

The record

CVE
CVE-2022-48634
Published
Apr 28, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-667, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 28, 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=5.6
  2. Affected versionversion=f76c22ce8fbbd03394eb9e2cd8c490d9ad2a116c <63e37a79f7bd939314997e29c2f5a9f0ef184281
  3. Affected versionversion=f76c22ce8fbbd03394eb9e2cd8c490d9ad2a116c <a6ed7624bf4d0a32f2631e74828bca7b7bf15afd
  4. Affected versionversion=f76c22ce8fbbd03394eb9e2cd8c490d9ad2a116c <c5812807e416618477d1bb0049727ce8bb8292fd
  5. Affected versionversion=f76c22ce8fbbd03394eb9e2cd8c490d9ad2a116c <e5ae504c8623476e13032670f1a6d6344d53ec9b

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.6; version=f76c22ce8fbbd03394eb9e2cd8c490d9ad2a116c <63e37a79f7bd939314997e29c2f5a9f0ef184281; version=f76c22ce8fbbd03394eb9e2cd8c490d9ad2a116c <a6ed7624bf4d0a32f2631e74828bca7b7bf15afd; version=f76c22ce8fbbd03394eb9e2cd8c490d9ad2a116c <c5812807e416618477d1bb0049727ce8bb8292fd; version=f76c22ce8fbbd03394eb9e2cd8c490d9ad2a116c <e5ae504c8623476e13032670f1a6d6344d53ec9b

Published CVSS scores

4.1Amazon LinuxCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:N/A:H
5.5SUSECVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.3CISA-ADPCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L

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

CWE-667Improper Locking
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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