PT-2021-8216 · Linux+3 · Linux Kernel+3

Shuang Li · Published 2021-12-13 · Updated 2025-07-28 · CVE-2021-47595

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 versions prior to 5.16.0-rc4+

Description The vulnerability is related to a memory corruption issue in the ets qdisc change() function of the sch ets component. This issue can cause a kernel bug, leading to a crash when a specific script is executed. The script involves adding and changing traffic control disciplines using the tc command. The vulnerability can be exploited to cause a denial of service.

Recommendations To resolve this issue, update the Linux kernel to a version later than 5.16.0-rc4+. As a temporary workaround, consider disabling the sch ets module until a patch is available.

Exploit

Fix

Buffer Overflow

Weakness Enumeration

CWE-119

Related Identifiers

BDU:2024-11529

CVE-2021-47595

OPENSUSE-SU-2024_2362-1

OPENSUSE-SU-2024_2372-1

OPENSUSE-SU-2024_2394-1

SUSE-SU-2024:2362-1

SUSE-SU-2024:2372-1

SUSE-SU-2024:2384-1

SUSE-SU-2024:2394-1

SUSE-SU-2024:2939-1

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

Linux Kernel

Red Os

Suse

References · 1782

• 🔥 https://github.com/rapid7/metasploit-framework/blob/master/modules/exploits/linux/local/vmwgfx_fd_priv_esc.rb · Exploit
• 🔥 https://github.com/aels/CVE-2022-2586-LPE · Exploit
• 🔥 https://github.com/sniper404ghostxploit/CVE-2022-2586 · Exploit
• http://repo.red-soft.ru/redos/7.3c/x86_64/updates · Vendor Advisory
• https://git.kernel.org/stable/c/c062f2a0b04d86c5b8c9d973bea43493eaca3d32 · Patch
• https://git.kernel.org/stable/c/81fbdd45652d8605a029e78ef14a6aaa529c4e72 · Patch
• https://osv.dev/vulnerability/DEBIAN-CVE-2021-47595 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-47595 · Security Note
• https://osv.dev/vulnerability/SUSE-SU-2024:2384-1 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2024:2939-1 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2024:2362-1 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2024:2394-1 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2021-47595 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2021-47595 · Security Note
• https://osv.dev/vulnerability/CVE-2021-47595 · Vendor Advisory