CVE-2026-68256: drm/amd/display: detect_link_and_local_sink: DP alt mode timeout path leaks prev_sink reference

lowCVSS 3.3CVE-2026-68256

CSIRTS triage

vendor: Linux product: Linux kernel Memory corruption

What: A DP alt mode timeout handling path in drm/amd/display leaks the prev_sink reference.
Who is affected: Linux systems with AMD discrete graphics using DisplayPort alternative mode.
Urgency: Low priority; CVSS 3.3 indicates memory leak that may degrade system over time.
Action: Apply kernel patch to properly release prev_sink reference in DP alt mode timeout path.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source: Microsoft Security Response Center (INTL · vendor-psirt · site)
Severity: low — CVSS 3.3
Published: 2026-08-11
Exploitation: Not in CISA KEV at last sync

Original advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-68256

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Low exploitation riskCVE-2026-682560.18% 30-day exploitation probability — currently an unlikely target, but scores change as exploit code circulates. Riskier than 7% of all EPSS-scored CVEs.

Referenced CVEs

CVE	CSIRTS overview	External
CVE-2026-68256	coverage & exploitation status	NVD · CVE.org

Same CVEs, other sources

How other CERTs, PSIRTs and databases cover the vulnerabilities in this advisory.

unknownCVE-2026-68256: In the Linux kernel, the following vulnerability has been resolved: drm/amd/display: detect_li…nvd

Recent advisories for drm/amd/display

A cluster of recent advisories against the same product widens the attack surface — attackers routinely chain freshly published CVEs on one product, so review these together.

unknownCVE-2026-74732: In the Linux kernel, the following vulnerability has been resolved: drm/amd/display: Check for…nvd · 2026-08-22
highCVE-2026-74449: In the Linux kernel, the following vulnerability has been resolved: drm/amd/display: Fix divid…nvd · 2026-08-15
unknownCVE-2026-68436: In the Linux kernel, the following vulnerability has been resolved: drm/amd/display: use kvzal…nvd · 2026-08-12
criticalCVE-2026-68236: drm/amd/display: set new_stream to NULL after releasemsrc · 2026-08-11
mediumCVE-2026-68436: drm/amd/display: use kvzalloc to allocate struct dcmsrc · 2026-08-11
mediumCVE-2026-68235: drm/amd/display: dce100: skip non-DP stream encoders for DP MSTmsrc · 2026-08-11