PT-2024-11062 · Linux · Linux Kernel

Jens Axboe + 1 · Published 2021-04-19 · Updated 2024-04-10 · CVE-2021-46942

Positive Technologies (AI Summary)

CVSS v3.1

5.5

Medium

Base vector

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

Name of the Vulnerable Software and Affected Versions Linux kernel (affected versions not specified)

Description The issue is related to the io uring feature in the Linux kernel, where the function io uring cancel sqpoll() is intended to cancel all requests of a specified context. However, it uses per-task counters to track the number of inflight requests, which can lead to the function going to sleep waiting for requests to appear that will never happen. This can cause the task to hang. The issue affects contexts that share sqpoll and continue to use shared counters.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

RCE

Weakness Enumeration

CWE-20

Related Identifiers

BDU:2025-02868

CVE-2021-46942

Affected Products

Linux Kernel

References · 15

• https://git.kernel.org/stable/c/734551df6f9bedfbefcd113ede665945e9de0b99 · Patch
• https://bdu.fstec.ru/vul/2025-02868 · Security Note
• https://git.kernel.org/stable/c/cb5e0b3d0f993a6268c1a2c7ede2f9aa0c17ef68 · Patch
• https://osv.dev/vulnerability/CVE-2021-46942 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2021-46942 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-46942 · Security Note
• https://ubuntu.com/security/CVE-2021-46942 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2021-46942 · Security Note
• https://security-tracker.debian.org/tracker/CVE-2021-46942 · Vendor Advisory
• https://lore.kernel.org/linux-cve-announce/[e-mail] · Note
• https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2021-46942 · Note
• https://kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.12.3 · Note
• https://lore.kernel.org/linux-cve-announce/[e-mail]/T/#u · Note
• https://twitter.com/CVEnew/status/1762551324820803980 · Twitter Post
• https://git.kernel.org/linus/734551df6f9bedfbefcd113ede665945e9de0b99 · Note