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CVE-2024-35952: drm/ast: Fix soft lockup

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-05-20 · updated 2026-06-17
• Weakness: CWE-667

Description

In the Linux kernel, the following vulnerability has been resolved: drm/ast: Fix soft lockup There is a while-loop in ast_dp_set_on_off() that could lead to infinite-loop. This is because the register, VGACRI-Dx, checked in this API is a scratch register actually controlled by a MCU, named DPMCU, in BMC. These scratch registers are protected by scu-lock. If suc-lock is not off, DPMCU can not update these registers and then host will have soft lockup due to never updated status. DPMCU is used to control DP and relative registers to handshake with host's VGA driver. Even the most time-consuming task, DP's link training, is less than 100ms. 200ms should be enough.

Affected products

• Linux kernel: from 5.19 before 6.1.87; from 6.2 before 6.6.28; from 6.7 before 6.8.7; 6.9-rc1, 6.9-rc2, 6.9-rc3 — fixed in 6.1.87, 6.6.28, 6.8.7

How to fix

Upgrade to a fixed version: Linux kernel 6.1.87, 6.6.28, 6.8.7. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/35768baf0fdfc47ede42d899506bad78450e9294
• https://git.kernel.org/stable/c/8a6fea3fcb577a543ef67683ca7105bde49a38fb
• https://git.kernel.org/stable/c/a81b2acd43e24e419f65df97348c76a5a1496066
• https://git.kernel.org/stable/c/bc004f5038220b1891ef4107134ccae44be55109
• https://git.kernel.org/stable/c/35768baf0fdfc47ede42d899506bad78450e9294
• https://git.kernel.org/stable/c/8a6fea3fcb577a543ef67683ca7105bde49a38fb
• https://git.kernel.org/stable/c/a81b2acd43e24e419f65df97348c76a5a1496066
• https://git.kernel.org/stable/c/bc004f5038220b1891ef4107134ccae44be55109

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