What’s Vulnerable › Vulnerabilities

CVE-2025-39702: ipv6: sr: Fix MAC comparison to be constant-time

• Severity: high (CVSS 7.0 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-09-05 · updated 2026-10-19
• Weakness: CWE-203

Description

In the Linux kernel, the following vulnerability has been resolved: ipv6: sr: Fix MAC comparison to be constant-time To prevent timing attacks, MACs need to be compared in constant time. Use the appropriate helper function for this.

Affected products

• Debian Linux: 11.0
• Linux kernel: from 4.10 before 5.15.190; from 5.16 before 6.1.149; from 6.2 before 6.6.103; from 6.7 before 6.12.44; from 6.13 before 6.16.4; 6.17-rc1, 6.17-rc2 — fixed in 5.15.190, 6.1.149, 6.12.44, 6.16.4, 6.6.103

How to fix

Upgrade to a fixed version: Linux kernel 5.15.190, 6.1.149, 6.12.44, 6.16.4. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/3b348c9c8d2ca2c67559ffd0e258ae7e1107d4f0
• https://git.kernel.org/stable/c/3ddd55cf19ed6cc62def5e3af10c2a9df1b861c3
• https://git.kernel.org/stable/c/86b6d34717fe0570afce07ee79b8eeb40341f831
• https://git.kernel.org/stable/c/a458b2902115b26a25d67393b12ddd57d1216aaa
• https://git.kernel.org/stable/c/b3967c493799e63f648e9c7b6cb063aa2aed04e7
• https://git.kernel.org/stable/c/f7878d47560d61e3f370aca3cebb8f42a55b990a
• https://git.kernel.org/stable/c/ff55a452d56490047f5233cc48c5d933f8586884
• https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html
• https://cert-portal.siemens.com/productcert/html/ssa-032379.html

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