CVE-2025-21843

Local uninitialized data return via Panthor query

Published Mar 7, 2025 · Updated May 11, 2026

Use of uninitialized data in Linux 6.13 allows local users to receive unintended priority data through a Panthor device-query ioctl. panthor_ioctl_dev_query passes an uninitialized priorities_info object to PANTHOR_UOBJ_SET, which copies that object into user space. Access requires a Panthor DRM device and permission to issue the ioctl; published sources identify no concrete consequence beyond the unintended return.

CVSS severity5.5
Medium
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use of uninitialized data in Linux 6.13 allows local users to receive unintended priority data through a Panthor device-query ioctl. panthor_ioctl_dev_query passes an uninitialized priorities_info object to PANTHOR_UOBJ_SET, which copies that object into user space. Access requires a Panthor DRM device and permission to issue the ioctl; published sources identify no concrete consequence beyond the unintended return.

The record

CVE
CVE-2025-21843
Published
Mar 7, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-908
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. Mar 7, 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

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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=6.13
  2. Affected versionversion=f70000ef23527f6d928d1175c66c5fafa968814b <3b32b7f638fe61e9d29290960172f4e360e38233
  3. Affected versionversion=f70000ef23527f6d928d1175c66c5fafa968814b <64b95bbc08bacf3e4b05c8604e6a4fec43bb712a

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=6.13; version=f70000ef23527f6d928d1175c66c5fafa968814b <3b32b7f638fe61e9d29290960172f4e360e38233; version=f70000ef23527f6d928d1175c66c5fafa968814b <64b95bbc08bacf3e4b05c8604e6a4fec43bb712a

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
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-908Use of Uninitialized Resource

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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