CVE-2026-74732

System crash via unchecked timing-generator callback

Published Aug 22, 2026 · Updated Aug 22, 2026

NULL pointer dereference in affected Linux kernels allows local users to crash the system when disabling HDMI output on Southern Islands dGPUs. The dce110_set_avmute path unconditionally calls the timing generator's is_tg_enabled operation when older DCE implementations leave that ops-table entry unset. Reachability requires a Southern Islands discrete GPU driving HDMI; the resulting kernel oops or panic interrupts the host rather than exposing or altering data.

CVSS severity5.5
Medium
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

NULL pointer dereference in affected Linux kernels allows local users to crash the system when disabling HDMI output on Southern Islands dGPUs. The dce110_set_avmute path unconditionally calls the timing generator's is_tg_enabled operation when older DCE implementations leave that ops-table entry unset. Reachability requires a Southern Islands discrete GPU driving HDMI; the resulting kernel oops or panic interrupts the host rather than exposing or altering data.

The record

CVE
CVE-2026-74732
Published
Aug 22, 2026
Updated
Aug 22, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 22, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 22, 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=0 <6.12.104
  2. Affected versionversion=0 <6.18.45
  3. Affected versionversion=0 <7.1.9
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <3141e3d61469bba2624a91c5e2407f110b33b29e
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <5edbb409b0bc5001195f4b7cfca19122361211a1
  6. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <853c2d31408bd45dcf92d0eb1f06eb439a56cf04
  7. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d089f32d34f821c8f0ef23d5fcd77bd43c1b3b92

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=0 <6.12.104; version=0 <6.18.45; version=0 <7.1.9; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <3141e3d61469bba2624a91c5e2407f110b33b29e; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <5edbb409b0bc5001195f4b7cfca19122361211a1; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <853c2d31408bd45dcf92d0eb1f06eb439a56cf04; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d089f32d34f821c8f0ef23d5fcd77bd43c1b3b92

Published CVSS scores

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

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499Endpoint Denial of Service

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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo