PT-2025-37485 · Linux+1 · Linux Kernel+1

Published 2025-09-15 · Updated 2025-11-24 · CVE-2025-39804

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 flaw exists in the Linux kernel's poly1305 function within the arm64/poly1305 module. The issue involves register corruption in contexts where Single Instruction Multiple Data (SIMD) is not available. A missing safety check allowed the function to be called when SIMD registers were unusable, leading to potential register corruption and incorrect Message Authentication Code (MAC) computation. The fix restores a check to prevent the function from being called in such scenarios.

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

Exploit

Related Identifiers

CVE-2025-39804

Affected Products

Astra Linux

Linux Kernel

References · 15

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/39xxx/CVE-2025-39804.json · Exploit
• https://osv.dev/vulnerability/UBUNTU-CVE-2025-39804 · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2025-39804 · Security Note
• https://osv.dev/vulnerability/DEBIAN-CVE-2025-39804 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2025-39804 · Vendor Advisory
• https://nvd.nist.gov/vuln/detail/CVE-2025-39804 · Security Note
• https://ubuntu.com/security/CVE-2025-39804 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2025-39804 · Vendor Advisory
• https://git.kernel.org/stable/c/eec76ea5a7213c48529a46eed1b343e5cee3aaab · Patch
• https://git.kernel.org/stable/c/ef74efa598b7bbc5c24509f7f56af2806f81c339 · Patch
• https://t.me/cveNotify/143835 · Telegram Post
• https://t.me/cveNotify/135467 · Telegram Post
• https://twitter.com/CVEnew/status/1967575624718930040 · Twitter Post
• https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git · Note
• https://git.kernel.org/linus/eec76ea5a7213c48529a46eed1b343e5cee3aaab · Note