CVE-2024-35952

Summary

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 Software

VendorProductVersion RangeStatus
LinuxLinux594e9c04b5864b4b8b151ef4ba9521c59e0f5c54 < 8a6fea3fcb577a543ef67683ca7105bde49a38fbaffected
LinuxLinux594e9c04b5864b4b8b151ef4ba9521c59e0f5c54 < a81b2acd43e24e419f65df97348c76a5a1496066affected
LinuxLinux594e9c04b5864b4b8b151ef4ba9521c59e0f5c54 < 35768baf0fdfc47ede42d899506bad78450e9294affected
LinuxLinux594e9c04b5864b4b8b151ef4ba9521c59e0f5c54 < bc004f5038220b1891ef4107134ccae44be55109affected
LinuxLinux5.19affected
LinuxLinux0 < 5.19unaffected
LinuxLinux6.1.87 <= 6.1.*unaffected
LinuxLinux6.6.28 <= 6.6.*unaffected
LinuxLinux6.8.7 <= 6.8.*unaffected
LinuxLinux6.9 <= *unaffected

Weaknesses

ADP Enrichment

CVE Program Container

Additional References

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: partial

References