PT-2025-37967 · Linux+2 · Linux Kernel+2

Published 2025-09-16 · Updated 2026-03-13 · CVE-2025-39822

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 flaw exists in the Linux kernel’s io uring/kbuf subsystem related to signedness in the this len calculation. When importing and using buffers, the buf->len value is treated as unsigned. However, it is converted to a signed integer during commitment, potentially leading to unexpected behavior if the buffer size is large enough to be interpreted as a negative value. The issue is addressed by making the min t calculation unsigned.

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

Exploit

Related Identifiers

CVE-2025-39822

OPENSUSE-SU-2025:20172-1

SUSE-SU-2025:4393-1

SUSE-SU-2025:4516-1

SUSE-SU-2025:4517-1

SUSE-SU-2026:20012-1

SUSE-SU-2026:20015-1

SUSE-SU-2026:20021-1

Affected Products

Astra Linux

Debian

Linux Kernel

References · 285

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/39xxx/CVE-2025-39822.json · Exploit
• https://osv.dev/vulnerability/SUSE-SU-2026:20012-1 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2025:4517-1 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2025-39822 · Vendor Advisory
• https://git.kernel.org/stable/c/f4f411c068402c370c4f9a9d4950a97af97bbbb1 · Patch
• https://osv.dev/vulnerability/SUSE-SU-2026:20015-1 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2025:4516-1 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2025:4393-1 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2025-39822 · Vendor Advisory
• https://osv.dev/vulnerability/openSUSE-SU-2025:20172-1 · Vendor Advisory
• https://osv.dev/vulnerability/UBUNTU-CVE-2025-39822 · Vendor Advisory
• https://osv.dev/vulnerability/BELL-CVE-2025-39822 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2025-39822 · Vendor Advisory
• https://git.kernel.org/stable/c/c64eff368ac676e8540344d27a3de47e0ad90d21 · Patch
• https://osv.dev/vulnerability/SUSE-SU-2026:20021-1 · Vendor Advisory