CVE-2026-53136

Summary

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 Software

VendorProductVersion RangeStatus
LinuxLinux1e8635ea0ea370bf4f0f2b2f1b3eb61474dd962a < 029571d51140650783be4fb98fe7cb4754752086affected
LinuxLinux1e8635ea0ea370bf4f0f2b2f1b3eb61474dd962a < 5f8b39452fb16f507c9e4d8b4a83ce27e893307caffected
LinuxLinux1e8635ea0ea370bf4f0f2b2f1b3eb61474dd962a < 4d1c3c26c2ab1842e139e61983395d64bd2e518baffected
LinuxLinux1e8635ea0ea370bf4f0f2b2f1b3eb61474dd962a < d6be8e59af412623e3d874be3a048406c0edfe60affected
LinuxLinux1e8635ea0ea370bf4f0f2b2f1b3eb61474dd962a < 3f32d52ec604c659725d865cf8cc6a17a33f9c6aaffected
LinuxLinux1e8635ea0ea370bf4f0f2b2f1b3eb61474dd962a < 8aaa7e317fbd4beb9c6a9f77aa4cf52fae78b117affected
LinuxLinux1e8635ea0ea370bf4f0f2b2f1b3eb61474dd962a < fb0707ce00eef4e2d60c3020e1c0432739703e4aaffected
LinuxLinux4.15affected
LinuxLinux0 < 4.15unaffected
LinuxLinux5.15.210 <= 5.15.*unaffected
LinuxLinux6.1.176 <= 6.1.*unaffected
LinuxLinux6.6.143 <= 6.6.*unaffected
LinuxLinux6.12.94 <= 6.12.*unaffected
LinuxLinux6.18.36 <= 6.18.*unaffected
LinuxLinux7.0.13 <= 7.0.*unaffected
LinuxLinux7.1 <= *unaffected

Weaknesses

References