PT-2025-49646 · Linux+4 · Linux Kernel+4

Published 2023-04-19 · Updated 2026-02-24 · CVE-2023-53786

Positive Technologies (AI Summary)

CVSS v2.0

6.0

Medium

Base vector

AV:L/AC:H/Au:S/C:C/I:C/A:C

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

Description A flaw exists in the Linux kernel related to device mapper (dm) flakey functionality. A specific command involving dmsetup create flakey with a crafted table can cause a NULL pointer dereference, leading to a system crash. The command utilizes blockdev --getsize /dev/ram0 to determine block size and attempts to create a device with a potentially invalid configuration. The issue is triggered when comparing a potentially NULL value, specifically arg name, without a prior check.

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

Exploit

Improper Resource Release

NULL Pointer Dereference

Weakness Enumeration

CWE-404

CWE-476

Related Identifiers

BDU:2026-01271

CVE-2023-53786

RHSA-2023:6583

RHSA-2023:7077

SUSE-SU-2026:0263-1

SUSE-SU-2026:0316-1

SUSE-SU-2026:0317-1

SUSE-SU-2026:0411-1

SUSE-SU-2026:0617-1

Affected Products

Centos

Linux Kernel

Red Hat

Blockdev

Dmsetup

References · 1123

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/53xxx/CVE-2023-53786.json · Exploit
• https://bdu.fstec.ru/vul/2026-01271 · Security Note
• https://osv.dev/vulnerability/UBUNTU-CVE-2023-53786 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2023-53786 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2026:0617-1 · Vendor Advisory
• https://ubuntu.com/security/CVE-2023-53786 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2026:0411-1 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2026:0263-1 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2026:0317-1 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2023-53786 · Security Note
• https://osv.dev/vulnerability/SUSE-SU-2026:0316-1 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2023-53786 · Security Note
• https://osv.dev/vulnerability/BELL-CVE-2023-53786 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2023-53786 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2023-53786 · Vendor Advisory