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CVE-2022-50036: drm/sun4i: dsi: Prevent underflow when computing packet sizes

• 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: 2025-06-18 · updated 2026-06-17
• Weakness: CWE-191

Description

In the Linux kernel, the following vulnerability has been resolved: drm/sun4i: dsi: Prevent underflow when computing packet sizes Currently, the packet overhead is subtracted using unsigned arithmetic. With a short sync pulse, this could underflow and wrap around to near the maximal u16 value. Fix this by using signed subtraction. The call to max() will correctly handle any negative numbers that are produced. Apply the same fix to the other timings, even though those subtractions are less likely to underflow.

Affected products

• Linux kernel: from 4.18 before 5.10.138; from 5.11 before 5.15.63; from 5.16 before 5.19.4; 6.0-rc1 — fixed in 5.10.138, 5.15.63, 5.19.4

How to fix

Upgrade to a fixed version: Linux kernel 5.10.138, 5.15.63, 5.19.4. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/82a1356a933d8443139f8886f11b63c974a09a67
• https://git.kernel.org/stable/c/98e28de472ef248352f04f87e29e634ebb0ec240
• https://git.kernel.org/stable/c/a1e7908f78f5a7f53f8cd83c7dcdfec974c95f26
• https://git.kernel.org/stable/c/fb837f5b83461624e525727a8f4add14b201147e

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