PT-2025-37223 · Linux+3 · Linux Kernel+3

Syzkaller · Published 2025-08-21 · Updated 2026-04-08 · CVE-2025-39765

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 versions prior to 6.15.8

Description: A flaw exists in the Linux kernel's ALSA timer functionality. Specifically, within the snd utimer create() function, a potential issue arises if the kasprintf() function returns NULL. This can lead to a call to snd utimer put id(), which subsequently attempts to free an unallocated ID (0) using ida free(). This condition was reported by the syzkaller fuzzer.

Recommendations: Update to Linux kernel version 6.15.8 or later.

Exploit

Fix

NULL Pointer Dereference

Allocation of Resources Without Limits

Weakness Enumeration

CWE-476

CWE-770

Related Identifiers

BDU:2025-15697

CVE-2025-39765

DSA-6008-1

OPENSUSE-SU-2025:20081-1

SUSE-SU-2025:21074-1

SUSE-SU-2025:21139-1

SUSE-SU-2025:21179-1

Affected Products

Astra Linux

Linux Kernel

Red Os

Suse

References · 1273

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/39xxx/CVE-2025-39765.json · Exploit
• https://osv.dev/vulnerability/BELL-CVE-2025-39765 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2025-39765 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2025-39765 · Security Note
• https://wiki.astralinux.ru/astra-linux-se18-bulletin-2025-1113SE18 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2025:21179-1 · Vendor Advisory
• https://git.kernel.org/stable/c/af386b52531d14c4b20f11c452787b1b6dd4eb8d · Patch
• https://osv.dev/vulnerability/ROOT-OS-DEBIAN-13-CVE-2025-39765 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2025:21139-1 · Vendor Advisory
• https://osv.dev/vulnerability/SUSE-SU-2025:21074-1 · Vendor Advisory
• https://linux.oracle.com/errata/ELSA-2025-25754.html · Vendor Advisory
• https://git.kernel.org/stable/c/5003a65790ed66be882d1987cc2ca86af0de3db1 · Patch
• https://osv.dev/vulnerability/CVE-2025-39765 · Vendor Advisory
• https://git.kernel.org/stable/c/34327b362ce2849a5eb02f47e800049e7a20a0ba · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2025-39765 · Security Note