PT-2024-2978 · Linux+2 · Linux Kernel+2

Vinay Kumar Yadav · Published 2024-02-27 · Updated 2024-08-19 · CVE-2021-46911

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 ch ktls component of the Linux kernel and is caused by the lack of synchronization locking. This can lead to a kernel panic when taking page refcount is not ideal, especially if an ACK is received during the transmission of an skb. To avoid page cleanup, it is better to take the tx ctx lock for the complete skb transmit.

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

Exploit

RCE

Weakness Enumeration

CWE-20

Related Identifiers

BDU:2024-03150

CVE-2021-46911

OPENSUSE-SU-2024_1489-1

SUSE-SU-2024:1465-1

SUSE-SU-2024:1489-1

Affected Products

Linux Kernel

Red Os

Suse

References · 342

• 🔥 https://github.com/Kakashiiiiy/CVE-2021-29155 · Exploit
• 🔥 https://github.com/benschlueter/CVE-2021-29155 · Exploit
• https://osv.dev/vulnerability/UBUNTU-CVE-2021-46911 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2021-46911 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2024:1489-1 · Vendor Advisory
• https://bdu.fstec.ru/vul/2024-03150 · Security Note
• https://git.kernel.org/stable/c/1a73e427b824133940c2dd95ebe26b6dce1cbf10 · Patch
• https://osv.dev/vulnerability/DEBIAN-CVE-2021-46911 · Vendor Advisory
• https://git.kernel.org/stable/c/8d5a9dbd2116a852f8f0f91f6fbc42a0afe1091f · Patch
• https://git.kernel.org/stable/c/8348665d4181c68b0ca1205b48e1753d78bc810f · Patch
• https://ubuntu.com/security/CVE-2021-46911 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2024:1465-1 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2021-46911 · Security Note
• https://security-tracker.debian.org/tracker/CVE-2021-46911 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-46911 · Security Note