CVE-2022-49948

In the Linux kernel, the following vulnerability has been resolved:

vt: Clear selection before changing the font

When changing the console font with ioctl(KDFONTOP) the new font size can be bigger than the previous font. A previous selection may thus now be outside of the new screen size and thus trigger out-of-bounds accesses to graphics memory if the selection is removed in vc_do_resize().

Prevent such out-of-memory accesses by dropping the selection before the various con_font_set() console handlers are called.

Affected Software

References

• https://git.kernel.org/stable/c/1cf1930369c9dc428d827b60260c53271bff3285
• https://git.kernel.org/stable/c/2535431ae967ad17585513649625fea7db28d4db
• https://git.kernel.org/stable/c/566f9c9f89337792070b5a6062dff448b3e7977f
• https://git.kernel.org/stable/c/989201bb8c00b222235aff04e6200230d29dc7bb
• https://git.kernel.org/stable/c/c555cf04684fde39b5b0dd9fd80730030ee10c4a
• https://git.kernel.org/stable/c/c904fe03c4bd1f356a58797d39e2a5d0ca15cefc
• https://git.kernel.org/stable/c/e9ba4611ddf676194385506222cce7b0844e708e
• https://git.kernel.org/stable/c/f74b4a41c5d7c9522469917e3072e55d435efd9e