CVE-2022-49948 [High] | Out-of-bounds Read in Linux Kernel

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.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2025-06-18	—	0.02%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2025-06-18

—

0.02%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
7.1	3.1	HIGH	`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H` Click to expand Attack vector (AV:L) They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by. Attack complexity (AC:L) Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup. Privileges required (PR:L) A normal user session is enough; they don’t have to be admin. User interaction (UI:N) Nobody has to click “OK” or open a trap file; it can work without a victim helping. Scope (S:U) Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems. Confidentiality (C:H) Serious risk that confidential data gets exposed in a big way. Integrity (I:N) Data isn’t meaningfully altered or forged. Availability (A:H) Could take the service down hard or make it unusable for people who depend on it.	1.8	5.2	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

7.1

3.1

HIGH

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

Attack vector (AV:L): They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
Attack complexity (AC:L): Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L): A normal user session is enough; they don’t have to be admin.
User interaction (UI:N): Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U): Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H): Serious risk that confidential data gets exposed in a big way.
Integrity (I:N): Data isn’t meaningfully altered or forged.
Availability (A:H): Could take the service down hard or make it unusable for people who depend on it.

1.8

5.2

[email protected]

OS Trackers for CVE-2022-49948

vendor	priority	summary	link
`debian`	not yet assigned	CVE-2022-49948 not yet assigned priority: Debian including 1 source packages (linux), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5.	https://security-tracker.debian.org/tracker/CVE-2022-49948
`redhat`	medium	—	https://access.redhat.com/security/cve/CVE-2022-49948
`suse`	medium	—	https://www.suse.com/security/cve/CVE-2022-49948/
`ubuntu`	medium	CVE-2022-49948 medium priority: Ubuntu including 158 source packages (linux, linux-allwinner-5.19, …), 1551 status rows across 10 suites (bionic, focal, jammy, noble, oracular, plucky, questing, trusty, upstream, xenial): DNE 1145, released 151, ignored 150, not-affected 99, needed 5, needs-triage 1.	https://ubuntu.com/security/CVE-2022-49948

Affected software / configurations for CVE-2022-49948

Vendor	Product	Version	Raw CPE
linux	linux_kernel	< 4.9.328	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 4.10, < 4.14.293	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 4.15, < 4.19.258	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 4.20, < 5.4.213	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 5.5, < 5.10.142	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 5.11, < 5.15.66	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 5.16, < 5.19.8	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	6.0	cpe:2.3:o:linux:linux_kernel:6.0:rc1::::::
linux	linux_kernel	6.0	cpe:2.3:o:linux:linux_kernel:6.0:rc2::::::
linux	linux_kernel	6.0	cpe:2.3:o:linux:linux_kernel:6.0:rc3::::::

References for CVE-2022-49948

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

URL

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

Exploit prediction scoring system (EPSS) score for CVE-2022-49948

Common vulnerability scoring system (CVSS) metrics for CVE-2022-49948

Weakness enumeration for CVE-2022-49948

OS Trackers for CVE-2022-49948

Affected software / configurations for CVE-2022-49948

References for CVE-2022-49948