CVE-2026-53136
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)
How to fix
- linux linux_kernel5.15.210, 6.1.176, 6.6.143, 6.12.94, 6.18.36, 7.0.13 or later
- git.kernel.org/stable/c/029571d51140650783be4fb98fe7cb4754752086
- git.kernel.org/stable/c/3f32d52ec604c659725d865cf8cc6a17a33f9c6a
- git.kernel.org/stable/c/4d1c3c26c2ab1842e139e61983395d64bd2e518b
- git.kernel.org/stable/c/5f8b39452fb16f507c9e4d8b4a83ce27e893307c
- git.kernel.org/stable/c/8aaa7e317fbd4beb9c6a9f77aa4cf52fae78b117
- git.kernel.org/stable/c/d6be8e59af412623e3d874be3a048406c0edfe60
- git.kernel.org/stable/c/fb0707ce00eef4e2d60c3020e1c0432739703e4a
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| linux linux_kernel | 4.15 ≤ v < 5.15.210, 5.16 ≤ v < 6.1.176, 6.2 ≤ v < 6.6.143, 6.7 ≤ v < 6.12.94, 6.13 ≤ v < 6.18.36, 6.19 ≤ v < 7.0.13, 7.1 | 5.15.210, 6.1.176, 6.6.143, 6.12.94, 6.18.36, 7.0.13 |
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