PT-2025-18819 · Linux+3 · Linux Kernel+3

Published 2023-03-13 · Updated 2026-03-14 · CVE-2023-53055

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 The issue is related to the Linux kernel's fscrypt, where the keyring is not properly destroyed after security sb delete(), leading to a potential NULL dereference. This problem occurs when Landlock is used on encrypted files. The function fscrypt destroy keyring() must be called after all potentially-encrypted inodes were evicted, and since inodes in-use by the Landlock LSM don't get evicted until security sb delete(), fscrypt destroy keyring() must be called after security sb delete().

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

Exploit

NULL Pointer Dereference

Weakness Enumeration

CWE-476

Related Identifiers

BDU:2025-06838

CVE-2023-53055

Affected Products

Astra Linux

Debian

Linux Kernel

Red Os

References · 23

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/53xxx/CVE-2023-53055.json · Exploit
• https://osv.dev/vulnerability/ROOT-OS-DEBIAN-11-CVE-2023-53055 · Vendor Advisory
• https://git.kernel.org/stable/c/ccb820dc7d2236b1af0d54ae038a27b5b6d5ae5a · Patch
• https://security-tracker.debian.org/tracker/CVE-2023-53055 · Vendor Advisory
• https://git.kernel.org/stable/c/992a3f3e8a0c92151dfdf65fc85567c865fd558a · Patch
• https://ubuntu.com/security/CVE-2023-53055 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2023-53055 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2023-53055 · Vendor Advisory
• https://osv.dev/vulnerability/BELL-CVE-2023-53055 · Vendor Advisory
• https://git.kernel.org/stable/c/d77531fac6a1fd9f1db0195438ba5419d72b96c4 · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2023-53055 · Security Note
• https://git.kernel.org/stable/c/497ab5d9c7852dfedab2c9de75e41b60e54b7c5d · Patch
• https://osv.dev/vulnerability/DEBIAN-CVE-2023-53055 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2023-53055 · Security Note
• https://bdu.fstec.ru/vul/2025-06838 · Security Note