CVE-2022-49191 [Medium] | Information Disclosure in Linux Kernel

In the Linux kernel, the following vulnerability has been resolved: mxser: fix xmit_buf leak in activate when LSR == 0xff When LSR is 0xff in ->activate() (rather unlike), we return an error. Provided ->shutdown() is not called when ->activate() fails, nothing actually frees the buffer in this case. Fix this by properly freeing the buffer in a designated label. We jump there also from the "!info->type" if now too.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-05-25	0.06%	0.04%	-0.01%
2	2026-04-06	0.03%	0.06%	+0.03%
3	2025-11-21	—	0.03%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-05-25

0.06%

0.04%

-0.01%

2026-04-06

0.03%

0.06%

+0.03%

2025-11-21

—

0.03%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
5.5	3.1	MEDIUM	`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/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:N) Doesn’t really leak secrets in a meaningful 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	3.6	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

5.5

3.1

MEDIUM

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/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:N): Doesn’t really leak secrets in a meaningful 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

3.6

[email protected]

OS Trackers for CVE-2022-49191

vendor	priority	summary	link
`debian`	not yet assigned	CVE-2022-49191 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-2022-49191
`redhat`	—	—	https://access.redhat.com/security/cve/CVE-2022-49191
`suse`	medium	CVE-2022-49191 severity moderate: SUSE including 276 source package names (amazon/suse-sles-15-sp1-chost-byos-v20210304-hvm-ssd-x86_64, amazon/suse-sles-15-sp1-chost-byos-v20220127-hvm-ssd-x86_64, …), 421 product×package rows across 38 product lines (Image SLES12-SP5-Azure-BYOS, Image SLES12-SP5-Azure-HPC-BYOS, … (38 product lines)): Known Affected 231, Known Not Affected 110, Fixed 80.	https://www.suse.com/security/cve/CVE-2022-49191/
`ubuntu`	medium	CVE-2022-49191 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, ignored 149, released 145, not-affected 108, needed 4.	https://ubuntu.com/security/CVE-2022-49191

Affected software / configurations for CVE-2022-49191

Vendor	Product	Version	Raw CPE
linux	linux_kernel	>= 2.6.33, < 4.9.311	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 4.10, < 4.14.276	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 4.15, < 4.19.238	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 4.20, < 5.4.189	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 5.5, < 5.10.110	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 5.11, < 5.15.33	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 5.16, < 5.16.19	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 5.17, < 5.17.2	cpe:2.3:o:linux:linux_kernel::::::::

References for CVE-2022-49191

URL	Tags
https://git.kernel.org/stable/c/125b7c929fc9b1e5eaa344bceb6367dfa6fd3f9d	Patch
https://git.kernel.org/stable/c/2cd05c38a27bee7fb42aa4d43174d68ac55dac0f	Patch
https://git.kernel.org/stable/c/376922045009f8ea2d20a8fa3475e95b47c41690	Patch
https://git.kernel.org/stable/c/685b6d16bf89595310b5d61394c9b97cc9505c7c	Patch
https://git.kernel.org/stable/c/6c9041b2f90c0eace73106f22350e1d2c98f5edc	Patch
https://git.kernel.org/stable/c/6dffc2035fbaada60ca8db59e0962e34f760370a	Patch
https://git.kernel.org/stable/c/996291d06851a26678a0fab488b6e1f0677c0576	Patch
https://git.kernel.org/stable/c/b125b08dbee3611f03f53b71471813ed4ccafcdd	Patch
https://git.kernel.org/stable/c/cd3a4907ee334b40d7aa880c7ab310b154fd5cd4	Patch

URL

CVE-2022-49191 | mxser: fix xmit_buf leak in activate when LSR == 0xff

Exploit prediction scoring system (EPSS) score for CVE-2022-49191

Common vulnerability scoring system (CVSS) metrics for CVE-2022-49191

Weakness enumeration for CVE-2022-49191

OS Trackers for CVE-2022-49191

Affected software / configurations for CVE-2022-49191

References for CVE-2022-49191