CVE-2022-50271 [Medium] | Security Vulnerability in Linux Kernel

In the Linux kernel, the following vulnerability has been resolved: vhost/vsock: Use kvmalloc/kvfree for larger packets. When copying a large file over sftp over vsock, data size is usually 32kB, and kmalloc seems to fail to try to allocate 32 32kB regions. vhost-5837: page allocation failure: order:4, mode:0x24040c0 Call Trace: [<ffffffffb6a0df64>] dump_stack+0x97/0xdb [<ffffffffb68d6aed>] warn_alloc_failed+0x10f/0x138 [<ffffffffb68d868a>] ? __alloc_pages_direct_compact+0x38/0xc8 [<ffffffffb664619f>] __alloc_pages_nodemask+0x84c/0x90d [<ffffffffb6646e56>] alloc_kmem_pages+0x17/0x19 [<ffffffffb6653a26>] kmalloc_order_trace+0x2b/0xdb [<ffffffffb66682f3>] __kmalloc+0x177/0x1f7 [<ffffffffb66e0d94>] ? copy_from_iter+0x8d/0x31d [<ffffffffc0689ab7>] vhost_vsock_handle_tx_kick+0x1fa/0x301 [vhost_vsock] [<ffffffffc06828d9>] vhost_worker+0xf7/0x157 [vhost] [<ffffffffb683ddce>] kthread+0xfd/0x105 [<ffffffffc06827e2>] ? vhost_dev_set_owner+0x22e/0x22e [vhost] [<ffffffffb683dcd1>] ? flush_kthread_worker+0xf3/0xf3 [<ffffffffb6eb332e>] ret_from_fork+0x4e/0x80 [<ffffffffb683dcd1>] ? flush_kthread_worker+0xf3/0xf3 Work around by doing kvmalloc instead.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2025-09-16	—	0.02%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2025-09-16

—

0.02%

—

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-2022-50271

vendor	priority	summary	link
`debian`	not yet assigned	CVE-2022-50271 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-2022-50271
`redhat`	low	—	https://access.redhat.com/security/cve/CVE-2022-50271
`suse`	medium	—	https://www.suse.com/security/cve/CVE-2022-50271/
`ubuntu`	medium	CVE-2022-50271 medium priority: Ubuntu including 158 source packages (linux, linux-allwinner-5.19, …), 1414 status rows across 9 suites (bionic, focal, jammy, noble, plucky, questing, trusty, upstream, xenial): DNE 1017, ignored 158, released 148, not-affected 90, needs-triage 1.	https://ubuntu.com/security/CVE-2022-50271

Affected software / configurations for CVE-2022-50271

Vendor	Product	Version	Raw CPE
linux	linux_kernel	>= 4.8, < 4.14.296	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 4.15, < 4.19.262	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 4.20, < 5.4.220	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 5.5, < 5.10.150	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 5.11, < 5.15.75	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 5.16, < 5.19.17	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 6.0, < 6.0.3	cpe:2.3:o:linux:linux_kernel::::::::

References for CVE-2022-50271

URL	Tags
https://git.kernel.org/stable/c/0d720c3f0a03e97867deab7e480ba3d3e19837ba	Patch
https://git.kernel.org/stable/c/0e3f72931fc47bb81686020cc643cde5d9cd0bb8	Patch
https://git.kernel.org/stable/c/36c9f340c60413e28f980c0224c4e9d35851526b	Patch
https://git.kernel.org/stable/c/7aac8c63f604e6a6a46560c0f0188cd0332cf320	Patch
https://git.kernel.org/stable/c/a99fc6d818161d6f1ff3307de8bf5237f6cc34d8	Patch
https://git.kernel.org/stable/c/b4a5905fd2ef841cd61e969ea692c213c2e5c1f7	Patch
https://git.kernel.org/stable/c/e28a4e7f0296824c61a81e7fd54ab48bad3e75ad	Patch
https://git.kernel.org/stable/c/e6d0152c95108651f1880c1ddfab47cb9e3e62d0	Patch

URL

CVE-2022-50271 | vhost/vsock: Use kvmalloc/kvfree for larger packets.

Exploit prediction scoring system (EPSS) score for CVE-2022-50271

Common vulnerability scoring system (CVSS) metrics for CVE-2022-50271

Weakness enumeration for CVE-2022-50271

OS Trackers for CVE-2022-50271

Affected software / configurations for CVE-2022-50271

References for CVE-2022-50271