CVE-2025-39702

HIGHNVD 7.07.0—

7.0

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 v3: 7.0
EG Score: 7.0(medium)
EPSS: 10.7%
KEV: Not listed

Published

September 5, 2025

Last Modified

May 12, 2026

References (9)

416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3b348c9c8d2ca2c67559ffd0e258ae7e1107d4f0
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3ddd55cf19ed6cc62def5e3af10c2a9df1b861c3
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/86b6d34717fe0570afce07ee79b8eeb40341f831
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a458b2902115b26a25d67393b12ddd57d1216aaa
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b3967c493799e63f648e9c7b6cb063aa2aed04e7
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f7878d47560d61e3f370aca3cebb8f42a55b990a
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ff55a452d56490047f5233cc48c5d933f8586884
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html
0b142b55-0307-4c5a-b3c9-f314f3fb7c5ehttps://cert-portal.siemens.com/productcert/html/ssa-032379.html

Vendor Advisories for CVE-2025-39702(1)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

CVE-2025-39702
Microsoft Security Response Center (MSRC)High
ipv6: sr: Fix MAC comparison to be constant-time

Patch Availability(30)

Vendor / Ecosystem	Fixed in / Patch	Released	Source
ubuntu	linux-tools-realtime-5.15 (5.15.0.1096.100) @ jammy	2026-05-21	ubuntu
ubuntu	linux-tools-gkeop-5.15 (5.15.0.1080.79) @ jammy	2026-05-21	ubuntu
ubuntu	linux-tools-kvm-5.15 (5.15.0.1089.85) @ jammy	2026-05-21	ubuntu
ubuntu	linux-tools-gcp-fips-5.15 (5.15.0.1097.87) @ jammy	2026-05-21	ubuntu
ubuntu	linux-tools-azure-fips-5.15 (5.15.0.1101.86) @ jammy	2026-05-21	ubuntu
ubuntu	linux-tools-azure-lts-22.04 (5.15.0.1101.99) @ jammy	2026-05-21	ubuntu
ubuntu	linux-tools-raspi-nolpae (5.15.0.1091.89) @ jammy	2026-05-21	ubuntu
ubuntu	linux-tools-azure-edge (5.15.0.1102.111~20.04.1) @ focal	2026-05-21	ubuntu
ubuntu	linux-tools-azure-lts-24.04 (6.8.0-1046.52) @ noble	2026-05-21	ubuntu
ubuntu	linux-tools-azure-fips-6.8 (6.8.0-1046.52+fips1) @ noble	2026-05-21	ubuntu
ubuntu	linux-xilinx-zynqmp (6.8.0.1023.24) @ noble	2026-05-21	ubuntu
ubuntu	linux-tools-ibm-lts-24.04 (6.8.0-1044.44) @ noble	2026-05-21	ubuntu
ubuntu	linux-tools-realtime-hwe-22.04 (6.8.1-1041.42~22.04.1) @ jammy	2026-05-21	ubuntu
ubuntu	linux-tools-azure-edge (6.8.0-1051.57~22.04.1) @ jammy	2026-05-21	ubuntu
ubuntu	linux-tools-lowlatency-hwe-20.04-edge (6.8.0-100.100.1) @ noble	2026-05-21	ubuntu
ubuntu	linux-tools-oracle-lts-24.04 (6.8.0-1043.44) @ noble	2026-05-21	ubuntu
ubuntu	linux-tools-nvidia-lowlatency-64k-6.8 (6.8.0-1046.49.1) @ noble	2026-05-21	ubuntu
ubuntu	linux-xilinx-zynqmp-tools-5.15.0-1061 (5.15.0-1061.65) @ jammy	2026-05-21	ubuntu
ubuntu	linux-tools-gcp-edge (6.8.0-1047.50~22.04.2) @ jammy	2026-05-21	ubuntu
ubuntu	linux-tools-gcp-fips-6.8 (6.8.0-1047.50+fips1) @ noble	2026-05-21	ubuntu
ubuntu	linux-virtual-6.8 (6.8.0-100.100) @ noble	2026-05-21	ubuntu
redhat	kernel-0:5.14.0-284.148.1.el9_2	2025-11-25	redhat
redhat	kernel-rt-0:5.14.0-284.148.1.rt14.433.el9_2	2025-11-25	redhat
redhat	kernel-0:5.14.0-427.100.1.el9_4	2025-11-19	redhat
redhat	kernel-0:6.12.0-124.9.1.el10_1	2025-11-12	redhat
redhat	kernel-0:5.14.0-611.7.1.el9_7	2025-11-12	redhat
redhat	kernel-rt-0:5.14.0-70.153.1.rt21.225.el9_0	2025-11-12	redhat
redhat	kernel-0:5.14.0-70.153.1.el9_0	2025-11-12	redhat
redhat	kernel-0:6.12.0-55.42.1.el10_0	2025-11-03	redhat
redhat	kernel-0:5.14.0-570.60.1.el9_6	2025-11-03	redhat

Patches are aggregated from vendor advisories (Red Hat, Microsoft, Cisco, GitHub) and package ecosystems (OSV, GHSA). Multiple rows for the same upstream release have been deduplicated.

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

CWE-203Observable Discrepancy (Information Exposure via Side Channel)

Additional Vendor Advisories

(24)

Vendors that published advisories for this CVE beyond the curated set above. Broader coverage but minimal per-row detail — click through for the original advisory.

Data Freshness Timeline

(refreshed 10× in last 7d / 20× in last 30d)

Every time one of our enrichment pipelines (NVD, MITRE cvelistV5, EPSS, CISA KEV, GHSA, OSV, vendor advisories) ran against this CVE. Most recent first.

2026-06-04 13:12 UTCepss_batch
2026-06-04 13:12 UTCepss_batch
2026-06-02 20:12 UTCepss_batch
2026-06-02 16:32 UTCOSV refresh
2026-06-01 13:51 UTCepss_batch
2026-06-01 13:51 UTCepss_batch
2026-05-31 22:30 UTCepss_batch
2026-05-31 22:30 UTCepss_batch
2026-05-31 00:16 UTCepss_batch
2026-05-29 13:44 UTCepss_batch
2026-05-28 13:44 UTCepss_batch
2026-05-28 13:44 UTCepss_batch
2026-05-28 13:44 UTCepss_batch
2026-05-28 13:44 UTCepss_batch
2026-05-27 13:40 UTCepss_batch
2026-05-27 13:40 UTCepss_batch
2026-05-27 13:40 UTCepss_batch
2026-05-27 13:40 UTCepss_batch
2026-05-26 13:43 UTCepss_batch
2026-05-26 13:43 UTCepss_batch

Frequently asked(5)

What is CVE-2025-39702?

CVE-2025-39702 is a high vulnerability published on September 5, 2025. 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.

When was CVE-2025-39702 disclosed?

CVE-2025-39702 was first published in the National Vulnerability Database on September 5, 2025, with the most recent update on May 12, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.

Is CVE-2025-39702 actively exploited?

CVE-2025-39702 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 10.7% percentile likelihood of exploitation in the next 30 days — higher percentiles indicate greater predicted risk.

What is the CVSS score of CVE-2025-39702?

CVE-2025-39702 has a CVSS v3 base score of 7.0 (NVD).

How do I remediate CVE-2025-39702?

Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2025-39702, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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CVE-2025-39702

Published

Last Modified

References (9)

Vendor Advisories for CVE-2025-39702(1)

Patch Availability(30)

Weakness Classification(1)

Additional Vendor Advisories

Data Freshness Timeline

Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2025-39702?

Same vendor

Same CWE

CVE-2025-39702

📅 Published

🔄 Last Modified

🔗 References (9)

📣 Vendor Advisories for CVE-2025-39702(1)

Patch Availability(30)

Weakness Classification(1)

Additional Vendor Advisories

Data Freshness Timeline

❓ Frequently asked(5)

Dependency Blast Radius

Is Your Infrastructure Affected by CVE-2025-39702?

🔗 Related CVEs(same vendor + same CWE)

Same vendor

Same CWE

Published

Last Modified

References (9)

Vendor Advisories for CVE-2025-39702(1)

Frequently asked(5)

Related CVEs(same vendor + same CWE)