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Vulnerability record · CVE-2026-53136 · published 25 June 2026

CVE-2026-53136: Linux kernel out-of-bounds write vulnerability

Linux · Linux Kernel

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)

7.8 CVSS 3.1 High EPSS 0.13% · top 97.9% CWE-787 · Out-of-bounds write
7.8CVSS 3.1 base score
0.13%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
7References
7 Jul 2026Last modified by NVD

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)

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://git.kernel.org/stable/c/029571d51140650783be4fb98fe7cb4754752086 Patch
https://git.kernel.org/stable/c/3f32d52ec604c659725d865cf8cc6a17a33f9c6a Patch
https://git.kernel.org/stable/c/4d1c3c26c2ab1842e139e61983395d64bd2e518b Patch
https://git.kernel.org/stable/c/5f8b39452fb16f507c9e4d8b4a83ce27e893307c Patch
https://git.kernel.org/stable/c/8aaa7e317fbd4beb9c6a9f77aa4cf52fae78b117 Patch
https://git.kernel.org/stable/c/d6be8e59af412623e3d874be3a048406c0edfe60 Patch
https://git.kernel.org/stable/c/fb0707ce00eef4e2d60c3020e1c0432739703e4a Patch

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Source: NIST National Vulnerability Database (record CVE-2026-53136), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.