CVE-2025-39702
Medium
Elevated severity or exploit probability.
CVSS base
9.8
CRITICAL
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
EPSS — probability of exploitation (30 days)
0.4%
36.1th percentile
CISA KEV
Not listed
Weakness / dates
CWE-203
Published 2025-09-05 · modified 2026-07-30
CVSS breakdown
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
| Attack Vector | N | Network |
| Attack Complexity | L | Low |
| Privileges Required | N | None |
| User Interaction | N | None |
| Scope | U | Unchanged |
| Confidentiality | H | High |
| Integrity | H | High |
| Availability | H | High |
Timeline
- 2025-09-05 — Published (NVD)
- 2026-07-30 — Last modified (NVD)
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
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