PT-2025-9980 · Linux+6 · Linux Kernel+6

Published 2025-01-23 · Updated 2026-04-20 · CVE-2025-21832

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, related to the blkdev read iter() function. This function has odd checks, such as gating the position and count adjustment based on the result being bigger-than-or-equal to zero, and not checking the return value of blkdev direct IO() before calling iov iter revert(). The latter can lead to attempting to revert with a negative value, causing a WARN ON() because unroll is bigger than MAX RW COUNT. The fix involves not reverting for -EIOCBQUEUED, similar to other parts of the code.

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

Exploit

Unchecked Return Value

Weakness Enumeration

CWE-252

Related Identifiers

BDU:2025-11975

CVE-2025-21832

DLA-4102-1

OESA-2025-1371

OESA-2025-1372

OPENSUSE-SU-2025_1177-1

OPENSUSE-SU-2025_1178-1

OPENSUSE-SU-2025_1180-1

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-2025:20190-1

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

USN-7521-1

USN-7521-2

USN-7521-3

USN-7651-1

USN-7651-2

USN-7651-3

USN-7651-4

USN-7651-5

USN-7651-6

USN-7652-1

USN-7653-1

USN-7737-1

Affected Products

Astra Linux

Debian

Linuxmint

Linux Kernel

Red Os

Suse

Ubuntu

References · 1636

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/21xxx/CVE-2025-21832.json · Exploit
• https://ubuntu.com/security/CVE-2024-57997 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2025-21844 · Security Note
• https://ubuntu.com/security/notices/USN-7651-6 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-21871 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-37798 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-21864 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2025-21791 · Security Note
• https://ubuntu.com/security/CVE-2025-21791 · Vendor Advisory
• https://ubuntu.com/security/CVE-2024-50157 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-21820 · Vendor Advisory
• https://ubuntu.com/security/CVE-2024-58082 · Vendor Advisory
• https://ubuntu.com/security/CVE-2025-21742 · Vendor Advisory
• https://ubuntu.com/security/CVE-2024-58090 · Vendor Advisory
• https://osv.dev/vulnerability/USN-7651-5 · Vendor Advisory