PT-2026-8175 · Linux · Linux Kernel

Published 2025-01-01 · Updated 2026-04-20 · CVE-2025-71203

Positive Technologies (AI Summary)

CVSS v3.1

7.0

High

Base vector

AV:L/AC:H/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 The Linux kernel contains a flaw where the syscall number, a user-controlled value, is used to index into the syscall table. This can lead to speculative out-of-bounds access and potential data leakage through cache side channels. The issue is addressed by using array index nospec() to clamp the syscall number after a bounds check. The vulnerable component is the syscall table indexing process. The syscall number is a user-controlled value.

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

Exploit

Improper Validation of Array Index

Weakness Enumeration

CWE-129

Related Identifiers

AZL-77757

CVE-2025-71203

ECHO-34D1-9BD8-B75F

Affected Products

Linux Kernel

References · 23

• 🔥 https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/71xxx/CVE-2025-71203.json · Exploit
• https://git.kernel.org/stable/c/c45848936ebdb4fcab92f8c39510db83c16d0239 · Patch
• https://osv.dev/vulnerability/UBUNTU-CVE-2025-71203 · Vendor Advisory
• https://git.kernel.org/stable/c/25fd7ee7bf58ac3ec7be3c9f82ceff153451946c · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2025-71203 · Security Note
• https://security-tracker.debian.org/tracker/CVE-2025-71203 · Vendor Advisory
• https://osv.dev/vulnerability/CVE-2025-71203 · Vendor Advisory
• https://osv.dev/vulnerability/ROOT-OS-DEBIAN-13-CVE-2025-71203 · Vendor Advisory
• https://osv.dev/vulnerability/DEBIAN-CVE-2025-71203 · Vendor Advisory
• https://osv.dev/vulnerability/BELL-CVE-2025-71203 · Vendor Advisory
• https://osv.dev/vulnerability/ROOT-OS-UBUNTU-2404-CVE-2025-71203 · Vendor Advisory
• https://linux.oracle.com/errata/ELSA-2026-50160.html · Vendor Advisory
• https://cve.org/CVERecord?id=CVE-2025-71203 · Security Note
• https://ubuntu.com/security/CVE-2025-71203 · Vendor Advisory
• https://osv.dev/vulnerability/AZL-77757 · Vendor Advisory