PT-2025-8887 · Linux+7 · Linux Kernel+7

Fedor Pchelkin · Published 2025-01-14 · Updated 2026-04-20 · CVE-2025-21775

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 issue in the Linux kernel has been resolved, specifically in the ctucanfd module. The problem occurs when skb allocation fails, resulting in a NULL pointer to struct can frame. This issue is handled in most places within ctucan err interrupt() but was missing a NULL check in one location. The issue was discovered by the Linux Verification Center using the SVACE static analysis tool.

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

ALT-PU-2025-12647

AZL-57884

BDU:2025-12199

CVE-2025-21775

DLA-4102-1

OESA-2025-1446

OESA-2025-1450

OPENSUSE-SU-2025_1177-1

OPENSUSE-SU-2025_1178-1

OPENSUSE-SU-2025_1180-1

SUSE-SU-2025:01919-1

SUSE-SU-2025:1177-1

SUSE-SU-2025:1178-1

SUSE-SU-2025:1180-1

SUSE-SU-2025:20190-1

SUSE-SU-2025:20192-1

SUSE-SU-2025:20260-1

SUSE-SU-2025:20270-1

SUSE-SU-2025_1177-1

SUSE-SU-2025_1178-1

SUSE-SU-2025_1180-1

USN-7521-1

USN-7521-2

USN-7521-3

USN-7703-1

USN-7703-2

USN-7703-3

USN-7703-4

USN-7719-1

USN-7737-1

Affected Products

Alt Linux

Astra Linux

Debian

Linuxmint

Linux Kernel

Red Os

Suse

Ubuntu

References · 1650

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/21xxx/CVE-2025-21775.json · Exploit
• https://ubuntu.com/security/CVE-2024-57997 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2025-38240 · Security Note
• https://ubuntu.com/security/CVE-2025-21727 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2025-22049 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2025-21780 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2024-56651 · Security Note
• https://ubuntu.com/security/CVE-2025-21721 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-21716 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-21871 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-21725 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-21745 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2025-21941 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2025-21927 · Security Note
• https://nvd.nist.gov/vuln/detail/CVE-2025-21914 · Security Note