{"id":"CVE-2025-39823","title":"KVM: x86: use array_index_nospec with indices that come from guest","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: x86: use array_index_nospec with indices that come from guest\n\nmin and dest_id are guest-controlled indices. Using array_index_nospec()\nafter the bounds checks cla…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 4180bf1b655a791a0a6ef93a2ffffc762722c782 < 72777fc31aa7ab2ce00f44bfa3929c6eabbeaf48","Linux >= 4180bf1b655a791a0a6ef93a2ffffc762722c782 < 31a0ad2f60cb4816e06218b63e695eb72ce74974","Linux >= 4180bf1b655a791a0a6ef93a2ffffc762722c782 < d51e381beed5e2f50f85f49f6c90e023754efa12","Linux >= 4180bf1b655a791a0a6ef93a2ffffc762722c782 < 33e974c2d5a82b2f9d9ba0ad9cbaabc1c8e3985f","Linux >= 4180bf1b655a791a0a6ef93a2ffffc762722c782 < f49161646e03d107ce81a99c6ca5da682fe5fb69","Linux >= 4180bf1b655a791a0a6ef93a2ffffc762722c782 < 67a05679621b7f721bdba37a5d18665d3aceb695","Linux >= 4180bf1b655a791a0a6ef93a2ffffc762722c782 < f57a4bd8d6cb5af05b8ac1be9098e249034639fb","Linux >= 4180bf1b655a791a0a6ef93a2ffffc762722c782 < c87bd4dd43a624109c3cc42d843138378a7f4548","Linux 4.19"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-11-05T21:12:15.590639Z"},"published":"2025-09-16","updated":"2026-11-05","sourceUpdated":"2026-11-05T21:12:59.446Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2025-39823","references":[{"url":"https://git.kernel.org/stable/c/72777fc31aa7ab2ce00f44bfa3929c6eabbeaf48"},{"url":"https://git.kernel.org/stable/c/31a0ad2f60cb4816e06218b63e695eb72ce74974"},{"url":"https://git.kernel.org/stable/c/d51e381beed5e2f50f85f49f6c90e023754efa12"},{"url":"https://git.kernel.org/stable/c/33e974c2d5a82b2f9d9ba0ad9cbaabc1c8e3985f"},{"url":"https://git.kernel.org/stable/c/f49161646e03d107ce81a99c6ca5da682fe5fb69"},{"url":"https://git.kernel.org/stable/c/67a05679621b7f721bdba37a5d18665d3aceb695"},{"url":"https://git.kernel.org/stable/c/f57a4bd8d6cb5af05b8ac1be9098e249034639fb"},{"url":"https://git.kernel.org/stable/c/c87bd4dd43a624109c3cc42d843138378a7f4548"}],"tags":["cve.org"],"epss":0.00181,"epssPercentile":0.07718,"ingestedAt":"2026-11-05T22:38:32.031Z","slug":"CVE-2025-39823","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nKVM: x86: use array_index_nospec with indices that come from guest\n\nmin and dest_id are guest-controlled indices. Using array_index_nospec()\nafter the bounds checks clamps these values to mitigate speculative execution\nside-channels.\n\n## Affected\n\n- `Linux >= 4180bf1b655a791a0a6ef93a2ffffc762722c782 < 72777fc31aa7ab2ce00f44bfa3929c6eabbeaf48`\n- `Linux >= 4180bf1b655a791a0a6ef93a2ffffc762722c782 < 31a0ad2f60cb4816e06218b63e695eb72ce74974`\n- `Linux >= 4180bf1b655a791a0a6ef93a2ffffc762722c782 < d51e381beed5e2f50f85f49f6c90e023754efa12`\n- `Linux >= 4180bf1b655a791a0a6ef93a2ffffc762722c782 < 33e974c2d5a82b2f9d9ba0ad9cbaabc1c8e3985f`\n- `Linux >= 4180bf1b655a791a0a6ef93a2ffffc762722c782 < f49161646e03d107ce81a99c6ca5da682fe5fb69`\n- `Linux >= 4180bf1b655a791a0a6ef93a2ffffc762722c782 < 67a05679621b7f721bdba37a5d18665d3aceb695`\n- `Linux >= 4180bf1b655a791a0a6ef93a2ffffc762722c782 < f57a4bd8d6cb5af05b8ac1be9098e249034639fb`\n- `Linux >= 4180bf1b655a791a0a6ef93a2ffffc762722c782 < c87bd4dd43a624109c3cc42d843138378a7f4548`\n- `Linux 4.19`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}