What’s Vulnerable › Vulnerabilities

CVE-2022-49948: vt: Clear selection before changing the font

• Severity: high (CVSS 7.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-06-18 · updated 2026-10-15
• Weakness: CWE-125

Description

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 products

• Linux kernel: before 4.9.328; from 4.10 before 4.14.293; from 4.15 before 4.19.258; from 4.20 before 5.4.213; from 5.5 before 5.10.142; from 5.11 before 5.15.66 — fixed in 4.14.293, 4.19.258, 4.9.328, 5.10.142, 5.15.66, 5.19.8

How to fix

Upgrade to a fixed version: Linux kernel 4.14.293, 4.19.258, 4.9.328, 5.10.142. Check the vendor advisory for mitigations.

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

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