PT-2025-25884 · Linux+4 · Linux Kernel+4

Published 2022-08-30 · Updated 2025-07-28 · CVE-2022-49958

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 A vulnerability in the Linux kernel has been resolved, which was related to netdevice reference leaks in the attach default qdiscs() function. If a device has multiple queues and queue 0 fails to attach a qdisc due to memory issues, the device's qdisc will default to noop qdisc. However, other queues may still successfully attach to the default qdisc, triggering a fallback to the noqueue process. If the original attached qdisc is not released and a new one is directly attached, this will cause netdevice reference leaks.

Recommendations To fix this bug, clear any non-noop qdiscs that may have been assigned before trying to re-attach. At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Exploit

Memory Leak

Improper Resource Release

Weakness Enumeration

CWE-401

CWE-404

Related Identifiers

BDU:2026-02022

CESA-2023_2951

CVE-2022-49958

RHSA-2023:2458

RHSA-2023:2951

RHSA-2023_2458

RHSA-2023_2951

SUSE-SU-2025:02264-1

SUSE-SU-2025:02321-1

SUSE-SU-2025:02322-1

SUSE-SU-2025:02537-1

SUSE-SU-2025:2264-1

SUSE-SU-2025_02264-1

SUSE-SU-2025_02537-1

Affected Products

Astra Linux

Centos

Linux Kernel

Red Hat

Suse

References · 594

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/49xxx/CVE-2022-49958.json · Exploit
• https://security-tracker.debian.org/tracker/CVE-2022-49958 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2022-49958 · Security Note
• https://git.kernel.org/stable/c/44dfa645895a56f65461249deb5b81cd16560e2a · Patch
• https://osv.dev/vulnerability/DEBIAN-CVE-2022-49958 · Vendor Advisory
• https://git.kernel.org/stable/c/f612466ebecb12a00d9152344ddda6f6345f04dc · Patch
• https://ubuntu.com/security/CVE-2022-49958 · Vendor Advisory
• https://git.kernel.org/stable/c/a420d587260185407eda9c5766cfa9bdd5c39a56 · Patch
• https://osv.dev/vulnerability/SUSE-SU-2025:02537-1 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2022-49958 · Vendor Advisory
• https://git.kernel.org/stable/c/0c6c522857151ac00150fd01baeebf231fb7d142 · Patch
• https://bdu.fstec.ru/vul/2026-02022 · Security Note
• https://osv.dev/vulnerability/CVE-2022-49958 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2025:02321-1 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2022-49958 · Security Note