CVE-2025-39702 (GCVE-0-2025-39702)

Vulnerability from cvelistv5 – Published: 2025-09-05 17:21 – Updated: 2026-08-05 12:04
VLAI
Title
ipv6: sr: Fix MAC comparison to be constant-time
Summary
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.
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: bf355b8d2c30a289232042cacc1cfaea4923936c , < ff55a452d56490047f5233cc48c5d933f8586884 (git)
Affected: bf355b8d2c30a289232042cacc1cfaea4923936c , < 3b348c9c8d2ca2c67559ffd0e258ae7e1107d4f0 (git)
Affected: bf355b8d2c30a289232042cacc1cfaea4923936c , < 86b6d34717fe0570afce07ee79b8eeb40341f831 (git)
Affected: bf355b8d2c30a289232042cacc1cfaea4923936c , < 3ddd55cf19ed6cc62def5e3af10c2a9df1b861c3 (git)
Affected: bf355b8d2c30a289232042cacc1cfaea4923936c , < b3967c493799e63f648e9c7b6cb063aa2aed04e7 (git)
Affected: bf355b8d2c30a289232042cacc1cfaea4923936c , < f7878d47560d61e3f370aca3cebb8f42a55b990a (git)
Affected: bf355b8d2c30a289232042cacc1cfaea4923936c , < a458b2902115b26a25d67393b12ddd57d1216aaa (git)
Create a notification for this product.
Linux Linux Affected: 4.10
Unaffected: 0 , < 4.10 (semver)
Unaffected: 5.10.249 , ≤ 5.10.* (semver)
Unaffected: 5.15.190 , ≤ 5.15.* (semver)
Unaffected: 6.1.149 , ≤ 6.1.* (semver)
Unaffected: 6.6.103 , ≤ 6.6.* (semver)
Unaffected: 6.12.44 , ≤ 6.12.* (semver)
Unaffected: 6.16.4 , ≤ 6.16.* (semver)
Unaffected: 6.17 , ≤ * (original_commit_for_fix)
Create a notification for this product.
Siemens SIMATIC CN 4100 Affected: 0 , < V5.0 (custom)
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Show details on NVD website
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-07-30T08:58:02+00:00",
      "cve": "CVE-2025-39702",
      "id": "CVE-2025-39702",
      "initial_release_date": "2025-09-05T00:00:00+00:00",
      "product_status:fixed": "1868",
      "product_status:known_affected": "22",
      "product_status:known_not_affected": "90",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: ipv6: sr: Fix MAC comparison to be constant-time",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-39702.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-07-25T00:41:35Z",
      "cve": "CVE-2025-39702",
      "id": "CVE-2025-39702",
      "initial_release_date": "2025-09-05T23:23:02Z",
      "product_status:first_fixed": "2",
      "product_status:known_affected": "615",
      "product_status:known_not_affected": "22",
      "product_status:recommended": "566",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2025-39702",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2025-39702.json",
      "version": "43"
    }
  }
}



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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.