{"id":"CVE-2025-21863","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nio_uring: prevent opcode speculation\n\nsqe->opcode is used for different tables, make sure we santitise it\nagainst speculations.","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nio_uring: prevent opcode speculation\n\nsqe->opcode is used for different tables, make sure we santitise it\nagainst speculations.","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","vendor":"linux","product":"linux_kernel","affected":["linux_kernel >= 5.6, < 6.6.80","linux_kernel >= 6.7, < 6.12.17","linux_kernel >= 6.13, < 6.13.5","linux_kernel = 6.14"],"patched":["linux_kernel 6.13.5"],"published":"2025-03-12","updated":"2026-09-08","sourceUpdated":"2026-09-08T09:17:26.527","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2025-21863","references":[{"url":"https://git.kernel.org/stable/c/18eae8420081ef8e043ad455937bfb470ef08607","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/1e988c3fe1264708f4f92109203ac5b1d65de50b","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/506b9b5e8c2d2a411ea8fe361333f5081c56d23a","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/87e9eef43c758da267f6332678058a79764c7eba","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/b9826e3b26ec031e9063f64a7c735449c43955e4","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/d261ead565a080e3411b0dd04e6d58a52471cac8","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/fdbfd52bd8b85ed6783365ff54c82ab7067bd61b","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://cert-portal.siemens.com/productcert/html/ssa-019113.html","label":"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e"}],"tags":["nvd","cve.org"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2025-10-01T19:25:38.400104Z"},"epss":0.00233,"epssPercentile":0.14477,"ingestedAt":"2026-09-08T09:30:06.186Z","slug":"CVE-2025-21863","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nio_uring: prevent opcode speculation\n\nsqe->opcode is used for different tables, make sure we santitise it\nagainst speculations.\n\n## Affected\n\n- `linux_kernel >= 5.6, < 6.6.80`\n- `linux_kernel >= 6.7, < 6.12.17`\n- `linux_kernel >= 6.13, < 6.13.5`\n- `linux_kernel = 6.14`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `linux_kernel 6.13.5`","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}