CVE-2022-49948: linux kernel Out-of-bounds Read — Fix

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.

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CVSS v3.1 Score

7.1

HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

Weakness Type (CWE)

CWE-125 Out-of-bounds Read

Affected Products

Vendor	Product	Versions
linux	linux_kernel	< 4.9.328
linux	linux_kernel	4.10 — 4.14.293
linux	linux_kernel	4.15 — 4.19.258
linux	linux_kernel	4.20 — 5.4.213
linux	linux_kernel	5.5 — 5.10.142
linux	linux_kernel	5.11 — 5.15.66
linux	linux_kernel	5.16 — 5.19.8
linux	linux_kernel	All
linux	linux_kernel	All
linux	linux_kernel	All

References

Advisories & Patches

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

Frequently Asked Questions

What is 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. It has a CVSS v3.1 base score of 7.1 (HIGH).

How severe is CVE-2022-49948? +

CVE-2022-49948 has a CVSS v3.1 score of 7.1 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

What products are affected by CVE-2022-49948? +

CVE-2022-49948 affects products from linux, specifically: linux_kernel. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2022-49948? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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