{"id":"CVE-2023-53205","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: s390/diag: fix racy access of physical cpu number in diag 9c handler\n\nWe do check for target CPU == -1, but this might change at the time we\nare going to use it","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nKVM: s390/diag: fix racy access of physical cpu number in diag 9c handler\n\nWe do check for target CPU == -1, but this might change at the time we\nare going to use it. H…","severity":"high","cvss":7.3,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:L/I:N/A:H","cwe":["CWE-787"],"vendor":"linux","product":"linux_kernel","affected":["linux_kernel >= 5.13, < 5.15.121","linux_kernel >= 5.16, < 6.1.39","linux_kernel >= 6.2, < 6.4.4"],"patched":["linux_kernel 6.4.4"],"published":"2025-09-15","updated":"2026-10-15","sourceUpdated":"2026-10-15T22:17:39.427","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2023-53205","references":[{"url":"https://git.kernel.org/stable/c/0bc380beb78aa352eadbc21d934dd9606fcee808","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/86bfb18bad60fc468e5f112cbbd918462a8dd435","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/a9ccf140a2a03a0ae82be4bdfbdd17bdaea72ff5","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/dc7e0192c470a53d847c79a2796f9ac429477a26","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd","cve.org"],"epss":0.0017,"epssPercentile":0.06304,"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-10-15T21:34:27.370447Z"},"ingestedAt":"2026-10-15T22:48:25.402Z","slug":"CVE-2023-53205","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nKVM: s390/diag: fix racy access of physical cpu number in diag 9c handler\n\nWe do check for target CPU == -1, but this might change at the time we\nare going to use it. Hold the physical target CPU in a local variable to\navoid out-of-bound accesses to the cpu arrays.\n\n## Affected\n\n- `linux_kernel >= 5.13, < 5.15.121`\n- `linux_kernel >= 5.16, < 6.1.39`\n- `linux_kernel >= 6.2, < 6.4.4`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `linux_kernel 6.4.4`","depth":"twilight","depthScore":40,"depthScoreParts":{"impact":40.2,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}