5.5

CVE-2022-50036

drm/sun4i: dsi: Prevent underflow when computing packet sizes

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.
Daten sind bereitgestellt durch National Vulnerability Database (NVD)
Linux ≫ Linux Kernel Version >= 4.18 < 5.10.138
Linux ≫ Linux Kernel Version >= 5.11 < 5.15.63
Linux ≫ Linux Kernel Version >= 5.16 < 5.19.4
Linux ≫ Linux Kernel Version6.0 Updaterc1
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EPSS Metriken
Typ Quelle Score Percentile
EPSS FIRST.org 0.16% 0.054
CVSS Metriken
Quelle Base Score Exploit Score Impact Score Vector String
nvd@nist.gov 5.5 1.8 3.6
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE-191 Integer Underflow (Wrap or Wraparound)

The product subtracts one value from another, such that the result is less than the minimum allowable integer value, which produces a value that is not equal to the correct result.

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