PT-2022-6039 · Linux+2 · Linux Kernel+2

Arnaud Gatignol + 4 · Published 2022-07-31 · Updated 2023-05-16 · CVE-2022-47941

Positive Technologies (AI Summary)

CVSS v3.1

7.5

High

Base vector

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

Name of the Vulnerable Software and Affected Versions Linux kernel versions 5.15 through 5.19 before 5.19.2

Description An issue was discovered in ksmbd in the Linux kernel, related to a memory leak due to the omission of a kfree call in certain smb2 handle negotiate error conditions. This can be exploited by a remote attacker to cause a denial-of-service when handling SMB2 NEGOTIATE requests. The vulnerable code is located in fs/ksmbd/smb2pdu.c.

Recommendations For Linux kernel versions 5.15 through 5.19 before 5.19.2, update to version 5.19.2 or later to resolve the issue. As a temporary workaround, consider restricting access to the smb2 handle negotiate function to minimize the risk of exploitation.

Fix

Memory Leak

Weakness Enumeration

CWE-401

Related Identifiers

ALT-PU-2022-2453

ALT-PU-2022-2454

ALT-PU-2022-2474

ALT-PU-2022-2497

ALT-PU-2022-2682

ALT-PU-2022-2692

ALT-PU-2022-2915

ALT-PU-2022-2919

AZL-12096

BDU:2022-07503

CVE-2022-47941

OESA-2023-1012

ZDI-22-1687

Affected Products

Alt Linux

Astra Linux

Linux Kernel

References · 33

• https://github.com/torvalds/linux/commit/aa7253c2393f6dcd6a1468b0792f6da76edad917 · Patch
• https://security-tracker.debian.org/tracker/CVE-2022-47941 · Vendor Advisory
• https://bdu.fstec.ru/vul/2022-07503 · Security Note
• https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.19.2 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2022-47941 · Security Note
• https://zerodayinitiative.com/advisories/ZDI-22-1687 · Security Note
• https://osv.dev/vulnerability/OESA-2023-1012 · Vendor Advisory
• https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=aa7253c2393f6dcd6a1468b0792f6da76edad917 · Vendor Advisory
• https://osv.dev/vulnerability/AZL-12096 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2022-47939 · Security Note
• https://osv.dev/vulnerability/UBUNTU-CVE-2022-47941 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2022-47941 · Security Note
• https://wiki.astralinux.ru/astra-linux-se16-bulletin-20231214SE16 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2022-47938 · Security Note
• https://wiki.astralinux.ru/astra-linux-se17-bulletin-2023-0303SE17MD · Vendor Advisory