CVE-2026-53136

drm/amd/display: Clamp VBIOS HDMI retimer register count to array size

HIGH

7.8

CVSS Score

Published: June 25, 2026 at 08:38 AM UTC

Updated: July 7, 2026 at 05:09 PM UTC

1 product affected across 1 vendorLinux Kernel

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Severity

HIGH7.8

Exploit prediction

EPSS 0.1%

Description

In the Linux kernel, the following vulnerability has been resolved: drm/amd/display: Clamp VBIOS HDMI retimer register count to array size [Why & How] The VBIOS integrated info tables (v1_11 and v2_1) contain HdmiRegNum and Hdmi6GRegNum fields that are used as loop bounds when copying retimer I2C register settings into fixed-size arrays (dp*_ext_hdmi_reg_settings[9] and dp*_ext_hdmi_6g_reg_settings[3]). These u8 fields are not validated before use, so a malformed VBIOS can specify values up to 255, causing an out-of-bounds heap write during driver probe. Clamp each register count to the destination array size using min_t() before the copy loops, in both get_integrated_info_v11() and get_integrated_info_v2_1(). (cherry picked from commit 5a7f0ef90195940c54b0f5bb85b87da55f038c69)

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Linux Kernel · Linux

95%

4.15 ≤ v < 5.15.2104.15 ≤ v < 6.1.1764.15 ≤ v < 6.12.944.15 ≤ v < 6.18.364.15 ≤ v < 6.6.1434.15 ≤ v < 7.0.134.15 ≤ v < 7.15.16 ≤ v < 6.1.1766.13 ≤ v < 6.18.366.19 ≤ v < 7.0.136.2 ≤ v < 6.6.1436.7 ≤ v < 6.12.941e8635ea0ea370bf4f0f2b2f1b3eb61474dd962a7.1 rc1 7.1 rc2 7.1 rc3 7.1 rc4 7.1 rc5 7.1 rc6

Vendor states this is fixed in 029571d51140650783be4fb98fe7cb4754752086 (fixed)

Vendor states this is fixed in 3f32d52ec604c659725d865cf8cc6a17a33f9c6a (fixed)

Vendor states this is fixed in 4d1c3c26c2ab1842e139e61983395d64bd2e518b (fixed)

Vendor states this is fixed in 5f8b39452fb16f507c9e4d8b4a83ce27e893307c (fixed)

Vendor states this is fixed in 8aaa7e317fbd4beb9c6a9f77aa4cf52fae78b117 (fixed)

Vendor states this is fixed in d6be8e59af412623e3d874be3a048406c0edfe60 (fixed)

Vendor states this is fixed in fb0707ce00eef4e2d60c3020e1c0432739703e4a (fixed)

Vendor states this is fixed in 4.15 (unaffected)

Vendor states this is fixed in 5.15.210 (unaffected)

Vendor states this is fixed in 6.1.176 (unaffected)

Vendor states this is fixed in 6.12.94 (unaffected)

Vendor states this is fixed in 6.18.36 (unaffected)