PT-2022-6557 · Linux+2 · Linux Kernel+2

Published 2022-11-25 · Updated 2023-09-05 · CVE-2023-2236

Positive Technologies (AI Summary)

CVSS v3.1

7.8

High

Base vector

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

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

Description A use-after-free vulnerability in the Linux Kernel io uring subsystem can be exploited to achieve local privilege escalation. Both io install fixed file and its callers call fput in a file in case of an error, causing a reference underflow which leads to a use-after-free vulnerability.

Recommendations Upgrade past commit 9d94c04c0db024922e886c9fd429659f22f48ea4 to resolve the issue. As a temporary workaround, consider restricting access to the io uring subsystem until a patch is available.

Exploit

Fix

LPE

Use After Free

Weakness Enumeration

CWE-416

Related Identifiers

ALT-PU-2022-3364

ALT-PU-2022-3371

ALT-PU-2023-1023

ALT-PU-2023-1064

BDU:2023-02406

CVE-2023-2236

Affected Products

Alt Linux

Linux Kernel

Red Os

References · 22

• 🔥 https://kernel.dance/9d94c04c0db024922e886c9fd429659f22f48ea4 · Exploit
• 🔥 https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=9d94c04c0db024922e886c9fd429659f22f48ea4 · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2023-2236 · Security Note
• https://osv.dev/vulnerability/CVE-2023-2236 · Vendor Advisory
• https://ubuntu.com/security/CVE-2023-2236 · Vendor Advisory
• http://repo.red-soft.ru/redos/7.3c/x86_64/updates · Vendor Advisory
• https://security.netapp.com/advisory/ntap-20230601-0010 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2023-2236 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2023-2236 · Security Note
• https://bdu.fstec.ru/vul/2023-02406 · Security Note
• https://osv.dev/vulnerability/DEBIAN-CVE-2023-2236 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2023-2236 · Vendor Advisory
• https://redos.red-soft.ru/support/secure/uyazvimosti/support/secure/uyazvimosti/mnozhestvennye-uyazvimosti-yadra-os-05-09-23-1 · Note
• https://kernel.dance/#9d94c04c0db024922e886c9fd429659f22f48ea4 · Note
• https://xn--80ahaefyxhn.xn--j1afgaq.xn--p1ai/bin/view/%D0%9E%D0%A1%D0%BD%D0%BE%D0%B2%D0%B0/%D0%9E%D0%B1%D0%BD%D0%BE%D0%B2%D0%BB%D0%B5%D0%BD%D0%B8%D1%8F/2.9 · Note