{"id":"CVE-2025-39702","title":"ipv6: sr: Fix MAC comparison to be constant-time","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nipv6: sr: Fix MAC comparison to be constant-time\n\nTo prevent timing attacks, MACs need to be compared in constant time.\nUse the appropriate helper function for this.","severity":"critical","cvss":9.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cvssSource":"cna","vendor":"Linux","product":"Linux","affected":["Linux >= bf355b8d2c30a289232042cacc1cfaea4923936c < ff55a452d56490047f5233cc48c5d933f8586884","Linux >= bf355b8d2c30a289232042cacc1cfaea4923936c < 3b348c9c8d2ca2c67559ffd0e258ae7e1107d4f0","Linux >= bf355b8d2c30a289232042cacc1cfaea4923936c < 86b6d34717fe0570afce07ee79b8eeb40341f831","Linux >= bf355b8d2c30a289232042cacc1cfaea4923936c < 3ddd55cf19ed6cc62def5e3af10c2a9df1b861c3","Linux >= bf355b8d2c30a289232042cacc1cfaea4923936c < b3967c493799e63f648e9c7b6cb063aa2aed04e7","Linux >= bf355b8d2c30a289232042cacc1cfaea4923936c < f7878d47560d61e3f370aca3cebb8f42a55b990a","Linux >= bf355b8d2c30a289232042cacc1cfaea4923936c < a458b2902115b26a25d67393b12ddd57d1216aaa","Linux 4.10"],"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"total","timestamp":"2026-10-15T21:53:32.850738Z"},"published":"2025-09-05","updated":"2026-10-15","sourceUpdated":"2026-10-15T22:02:30.641Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2025-39702","references":[{"url":"https://git.kernel.org/stable/c/ff55a452d56490047f5233cc48c5d933f8586884"},{"url":"https://git.kernel.org/stable/c/3b348c9c8d2ca2c67559ffd0e258ae7e1107d4f0"},{"url":"https://git.kernel.org/stable/c/86b6d34717fe0570afce07ee79b8eeb40341f831"},{"url":"https://git.kernel.org/stable/c/3ddd55cf19ed6cc62def5e3af10c2a9df1b861c3"},{"url":"https://git.kernel.org/stable/c/b3967c493799e63f648e9c7b6cb063aa2aed04e7"},{"url":"https://git.kernel.org/stable/c/f7878d47560d61e3f370aca3cebb8f42a55b990a"},{"url":"https://git.kernel.org/stable/c/a458b2902115b26a25d67393b12ddd57d1216aaa"}],"tags":["cve.org"],"epss":0.00432,"epssPercentile":0.37247,"ingestedAt":"2026-10-15T22:48:25.521Z","slug":"CVE-2025-39702","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nipv6: sr: Fix MAC comparison to be constant-time\n\nTo prevent timing attacks, MACs need to be compared in constant time.\nUse the appropriate helper function for this.\n\n## Affected\n\n- `Linux >= bf355b8d2c30a289232042cacc1cfaea4923936c < ff55a452d56490047f5233cc48c5d933f8586884`\n- `Linux >= bf355b8d2c30a289232042cacc1cfaea4923936c < 3b348c9c8d2ca2c67559ffd0e258ae7e1107d4f0`\n- `Linux >= bf355b8d2c30a289232042cacc1cfaea4923936c < 86b6d34717fe0570afce07ee79b8eeb40341f831`\n- `Linux >= bf355b8d2c30a289232042cacc1cfaea4923936c < 3ddd55cf19ed6cc62def5e3af10c2a9df1b861c3`\n- `Linux >= bf355b8d2c30a289232042cacc1cfaea4923936c < b3967c493799e63f648e9c7b6cb063aa2aed04e7`\n- `Linux >= bf355b8d2c30a289232042cacc1cfaea4923936c < f7878d47560d61e3f370aca3cebb8f42a55b990a`\n- `Linux >= bf355b8d2c30a289232042cacc1cfaea4923936c < a458b2902115b26a25d67393b12ddd57d1216aaa`\n- `Linux 4.10`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"midnight","depthScore":54,"depthScoreParts":{"impact":53.9,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}