PT-2024-11351 · Linux+7 · Linux Kernel+7

Arturo Giusti · Published 2021-05-20 · Updated 2025-06-04 · CVE-2021-47353

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 (affected versions not specified)

Description A NULL pointer dereference issue has been identified in the Linux kernel, specifically in the udf symlink function. The epos.bh variable is assigned a value returned by udf tgetblk, which can be NULL. Without proper validation, this leads to a potential NULL pointer dereference when sb getblk fails. The issue is resolved by adding a check to validate the value of epos.bh.

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

ALSA-2024:4211

ALSA-2024:4352

BDU:2025-07513

CESA-2024_4211

CESA-2024_4352

CVE-2021-47353

INFSA-2024_4211

INFSA-2024_4352

OESA-2024-1692

OPENSUSE-SU-2024_2185-1

RHSA-2024:4211

RHSA-2024:4352

RHSA-2024_4211

RHSA-2024_4352

RLSA-2024:4211

RLSA-2024:4352

RXSA-2024:4211

SUSE-SU-2024:1979-1

SUSE-SU-2024:1983-1

SUSE-SU-2024:2010-1

SUSE-SU-2024:2184-1

SUSE-SU-2024:2185-1

USN-7554-1

USN-7554-2

USN-7554-3

Affected Products

Almalinux

Astra Linux

Centos

Linux Kernel

Red Hat

Rocky Linux

Suse

Ubuntu

References · 963

• 🔥 https://github.com/lanleft/CVE-2023-1829 · Exploit
• https://osv.dev/vulnerability/SUSE-SU-2024:1983-1 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2021-47357 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2021-47443 · Security Note
• https://osv.dev/vulnerability/CVE-2021-47353 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2024-27020 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2024-36004 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2021-47397 · Security Note
• https://ubuntu.com/security/CVE-2024-26966 · Vendor Advisory
• https://git.kernel.org/stable/c/3638705ecd5ad2785e996f820121c0ad15ce64b5 · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2023-52693 · Security Note
• https://ubuntu.com/security/CVE-2024-56551 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2024-35877 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2024-35925 · Security Note
• https://osv.dev/vulnerability/SUSE-SU-2024:2185-1 · Vendor Advisory