Bug 2495957 (CVE-2026-53330)

Summary: CVE-2026-53330 kernel: drm/amd/display: Fix out-of-bounds read in dp_get_eq_aux_rd_interval()
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
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Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
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Hardware: All   
OS: Linux   
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A flaw was found in the Linux kernel's AMD display driver. This vulnerability allows for an out-of-bounds read when the system processes DisplayPort (DP) sink reports that exceed expected limits. This could potentially lead to the disclosure of sensitive information or cause the system to become unstable.
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Description OSIDB Bzimport 2026-07-01 14:03:38 UTC 
In the Linux kernel, the following vulnerability has been resolved:

drm/amd/display: Fix out-of-bounds read in dp_get_eq_aux_rd_interval()

[Why & How]
The aux_rd_interval array in struct dc_lttpr_caps is declared with
MAX_REPEATER_CNT - 1 (7) elements, indexed 0..6. However, the offset
parameter passed to dp_get_eq_aux_rd_interval() can be as large as
MAX_REPEATER_CNT (8) when a sink reports 8 LTTPR repeaters via DPCD.
This leads to an out-of-bounds read of aux_rd_interval[7] when offset
is 8.

Fix this by growing aux_rd_interval to MAX_REPEATER_CNT elements to
accommodate the full range of valid repeater counts defined by the DP
spec.

(cherry picked from commit a55a458a8df37a65ffda5cf721d554a8f74f6b04)
Comment 1 Mauro Matteo Cascella 2026-07-01 15:48:22 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026070142-CVE-2026-53330-0e20@gregkh/T