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Review reviewHigh

CVE-2025-21985

Linux Linux, linux kernel

In the Linux kernel, the following vulnerability has been resolved: drm/amd/display: Fix out-of-bound accesses [WHAT & HOW] hpo_stream_to_link_encoder_mapping has size MAX_HPO_DP2_ENCODERS(=4), but location can have size up to 6. As a result, it is necessary to check location against MAX_HPO_DP2_ENCODERS. Similiarly, disp_cfg_stream_location can be used as an array index which should be 0..5, so the ASSERT's conditions should be less without equal.

CVSS
7.1
EPSS
0.19%
8.59% percentile
CISA KEV
Not listed
Published
2025.04.02
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.19%
Technical severityCVSS 7.1

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: drm/amd/display: Fix out-of-bound accesses [WHAT & HOW] hpo_stream_to_link_encoder_mapping has size MAX_HPO_DP2_ENCODERS(=4), but location can have size up to 6. As a result, it is necessary to check location against MAX_HPO_DP2_ENCODERS. Similiarly, disp_cfg_stream_location can be used as an array index which should be 0..5, so the ASSERT's conditions should be less without equal.

Affected product and versions

Product
Linux Linux, linux kernel
Affected versions
>= 4562236b3bc0a28aeb6ee93b2d8a849a4c4e1c7c < 36793d90d76f667d26c6dd025571481ee0c96abc, >= 4562236b3bc0a28aeb6ee93b2d8a849a4c4e1c7c < 9aedc776b11038f04f4641241bb7e877781e4aa4, >= 4562236b3bc0a28aeb6ee93b2d8a849a4c4e1c7c < 8adbb2a98b00926315fd513b5fe2596b5716b82d, >= 4.15, >= 4.15 < 6.12.20, >= 6.13 < 6.13.8, 6.14
Fixed versions
6.12.20, 6.13.8

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux Linux, linux kernel and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
CWE
CWE-125
CVE-2025-21985 — Linux Linux, linux kernel | SECUFOCUS NOW