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Critical 9.8Published Sep 5, 2025
CVE-2025-39702ipv6: sr: Fix MAC comparison to be constant-time
Updated under an hour ago ()
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It affects Linux and 3 other products. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 9.8 CRITICAL (v3.1, CNA)CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Modified
- Record last updated
- Oct 15, 2026
- First seen by InfoSec Signals
- Oct 15, 2026
Affected products
Linux Linux linux:linux (from the name) | from bf355b8d2c30a289232042cacc1cfaea4923936c before ff55a452d56490047f5233cc48c5d933f8586884; from bf355b8d2c30a289232042cacc1cfaea4923936c before 3b348c9c8d2ca2c67559ffd0e258ae7e1107d4f0; from bf355b8d2c30a289232042cacc1cfaea4923936c before 86b6d34717fe0570afce07ee79b8eeb40341f831; from bf355b8d2c30a289232042cacc1cfaea4923936c before 3ddd55cf19ed6cc62def5e3af10c2a9df1b861c3; from bf355b8d2c30a289232042cacc1cfaea4923936c before b3967c493799e63f648e9c7b6cb063aa2aed04e7; from bf355b8d2c30a289232042cacc1cfaea4923936c before f7878d47560d61e3f370aca3cebb8f42a55b990a; from bf355b8d2c30a289232042cacc1cfaea4923936c before a458b2902115b26a25d67393b12ddd57d1216aaa | CNA record |
Siemens SIMATIC CN 4100 siemens:simatic_cn_4100 (from the name) | before V5.0 | CISA ADP |
linux linux_kernel linux: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; 6.17 | NVD |
debian debian_linux debian:debian_linux | 11.0 | NVD |
References
- https://git.kernel.org/stable/c/ff55a452d56490047f5233cc48c5d933f8586884patch
- https://git.kernel.org/stable/c/3b348c9c8d2ca2c67559ffd0e258ae7e1107d4f0patch
- https://git.kernel.org/stable/c/86b6d34717fe0570afce07ee79b8eeb40341f831patch
- https://git.kernel.org/stable/c/3ddd55cf19ed6cc62def5e3af10c2a9df1b861c3patch
- https://git.kernel.org/stable/c/b3967c493799e63f648e9c7b6cb063aa2aed04e7patch
- https://git.kernel.org/stable/c/f7878d47560d61e3f370aca3cebb8f42a55b990apatch
- https://git.kernel.org/stable/c/a458b2902115b26a25d67393b12ddd57d1216aaapatch
- https://lists.debian.org/debian-lts-announce/2025/10/msg00008.htmlmailing-list, third-party-advisory
- https://cert-portal.siemens.com/productcert/html/ssa-032379.html
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.