PT-2025-11017 · Linux+10 · Linux Kernel+10

Nick Child · Published 2025-02-14 · Updated 2026-05-26 · CVE-2025-21855

Positive Technologies (AI Summary)

CVSS v3.1

7.8

High

Base vector

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

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

Description: A use-after-free issue exists in the Linux kernel, specifically in the ibmvnic module. After sending a buffer to VIOS, it is invalid to access the skb memory because the VIOS can trigger an interrupt to free this memory at any point. A race between reading skb->len and freeing the skb is possible, resulting in a use-after-free error. This issue can occur especially during LPM.

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

Exploit

DoS

Use After Free

Weakness Enumeration

CWE-416

Related Identifiers

ALSA-2025:20095

ALSA-2025:20518

ALT-PU-2025-12647

ALT-PU-2025-4301

ALT-PU-2025-4807

BDU:2025-12079

CVE-2025-21855

DLA-4193-1

DSA-5900-1

ECHO-3D9B-3974-F293

INFSA-2025_20518

MGASA-2025-0111

MGASA-2025-0112

OESA-2025-1446

OESA-2025-1450

OESA-2025-1872

OESA-2025-1873

OPENSUSE-SU-2025_1177-1

OPENSUSE-SU-2025_1178-1

OPENSUSE-SU-2025_1180-1

RHSA-2025:20095

RHSA-2025:20518

RHSA-2025_20518

SUSE-SU-2025:01919-1

SUSE-SU-2025:01951-1

SUSE-SU-2025:01967-1

SUSE-SU-2025:1177-1

SUSE-SU-2025:1178-1

SUSE-SU-2025:1180-1

SUSE-SU-2025:1293-1

SUSE-SU-2025:20190-1

SUSE-SU-2025:20192-1

SUSE-SU-2025:20260-1

SUSE-SU-2025:20270-1

SUSE-SU-2025_01951-1

SUSE-SU-2025_01967-1

SUSE-SU-2025_1177-1

SUSE-SU-2025_1178-1

SUSE-SU-2025_1180-1

SUSE-SU-2025_1293-1

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

USN-7907-1

USN-7907-2

USN-7907-3

USN-7907-4

USN-7907-5

USN-7922-1

USN-7922-2

USN-7922-3

USN-7922-4

USN-7922-5

USN-7928-1

USN-7928-2

USN-7928-3

USN-7928-4

USN-7928-5

USN-7930-1

USN-7930-2

USN-7937-1

USN-7938-1

USN-7939-1

USN-7939-2

Affected Products

Alt Linux

Almalinux

Astra Linux

Debian

Linuxmint

Linux Kernel

Red Hat

Red Os

Rocky Linux

Suse

Ubuntu

References · 2718

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/21xxx/CVE-2025-21855.json · Exploit
• https://nvd.nist.gov/vuln/detail/CVE-2024-56602 · Security Note
• https://ubuntu.com/security/CVE-2025-21793 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2024-57911 · Security Note
• https://ubuntu.com/security/CVE-2024-49963 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-38576 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-38083 · Vendor Advisory
• https://osv.dev/vulnerability/MGASA-2025-0112 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-39734 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-21707 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2025-21858 · Security Note
• https://ubuntu.com/security/CVE-2025-39795 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-21867 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-21783 · Vendor Advisory
• https://ubuntu.com/security/CVE-2024-58007 · Vendor Advisory