fbcon: Avoid OOB font access if console rotation fails
3Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackepss 0.1%
exploitation probability
0.1%top 97% of all CVEs
observed exploitation
nono source reports it
In the Linux kernel, the following vulnerability has been resolved:
fbcon: Avoid OOB font access if console rotation fails
Clear the font buffer if the reallocation during console rotation fails
in fbcon_rotate_font(). The putcs implementations for the rotated buffer
will return early in this case. See [1] for an example.
Currently, fbcon_rotate_font() keeps the old buffer, which is too small
for the rotated font. Printing to the rotated console with a high-enough
character code will overflow the font buffer.
v2:
- fix typos in commit message
Affected products
Linux · LinuxReferences
https://git.kernel.org/stable/c/46cf3646dea54baeaa2eafe3fb1ba769947f31b0https://git.kernel.org/stable/c/524a6079395916fb3d790ef2bb46a1d2939b27ddhttps://git.kernel.org/stable/c/594973a2e54924d8ba31c9faac669fc1ba6fcb80https://git.kernel.org/stable/c/7105d9f1387d63b15c9a860674fc92c959181f2fhttps://git.kernel.org/stable/c/ab6c34b9829d5de03f1d08a47a2253729a6e7e27https://git.kernel.org/stable/c/b44cc78ff46b96e72d333a3be6aaaa0a14797263https://git.kernel.org/stable/c/b51c343a81e6e806525a4435e22532c107dd7e9dhttps://git.kernel.org/stable/c/e4ef723d8975a2694cc90733a6b888a5e2841842