CVE-2026-31584

Kernel memory corruption via unsynchronized encoder work

Published Apr 24, 2026 · Updated Apr 24, 2026

Use-after-free in the MediaTek V4L2 encoder in Linux Kernel 6.6 and later allows local users to corrupt kernel memory via device operations. The fops_vcodec_release function frees ctx without synchronizing ctx->encode_work, while mtk_venc_worker can still dereference that allocation. Access to the MediaTek encoder device node is required; winning the attacker-driven close race crashes the kernel or enables kernel-memory disclosure and corruption.

CVSS severity7.8
High
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in the MediaTek V4L2 encoder in Linux Kernel 6.6 and later allows local users to corrupt kernel memory via device operations. The fops_vcodec_release function frees ctx without synchronizing ctx->encode_work, while mtk_venc_worker can still dereference that allocation. Access to the MediaTek encoder device node is required; winning the attacker-driven close race crashes the kernel or enables kernel-memory disclosure and corruption.

The record

CVE
CVE-2026-31584
Published
Apr 24, 2026
Updated
Apr 24, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Apr 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 24, 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=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <93d9a58961a9e09306857e999b3ee76aa4be67f0
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a8a55913552aed45108525d1851c65e1db0cc25b
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <f1692337c6fa26e04f89b22a4d84bf5b7ada50d1
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <f99353cd0e9f58bf17889049137b8d65fb44ebf1

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <93d9a58961a9e09306857e999b3ee76aa4be67f0; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a8a55913552aed45108525d1851c65e1db0cc25b; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <f1692337c6fa26e04f89b22a4d84bf5b7ada50d1; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <f99353cd0e9f58bf17889049137b8d65fb44ebf1

Published CVSS scores

7.8LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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

T1068Exploitation for Privilege Escalation

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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