{"id":"CVE-2026-93786","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: preserve VFS inherited POSIX ACL mask\n\nThe VFS initializes a child's POSIX ACL from the parent's default ACL and\nthe requested creation mode","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: preserve VFS inherited POSIX ACL mask\n\nThe VFS initializes a child's POSIX ACL from the parent's default ACL and\nthe requested creation mode. Do not mutate the p…","severity":"high","cvss":8.1,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N","vendor":"Linux","product":"Linux","affected":["Linux >= f44158485826c076335d6860d35872271a83791d < 4a19bb1c45667f5a5f6eff9cf6648e0f692d046f","Linux >= f44158485826c076335d6860d35872271a83791d < 591acf171644de590cda245fd8595b473a1beb70","Linux >= f44158485826c076335d6860d35872271a83791d < 0093909becbda22b62b39b654dbc607faed59cd0","Linux >= f44158485826c076335d6860d35872271a83791d < e148e567a9252643baa125cb65d7ae9c2c6cf68a","Linux 5.15"],"published":"2026-09-24","updated":"2026-10-03","sourceUpdated":"2026-10-03T11:17:48.163","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-93786","references":[{"url":"https://git.kernel.org/stable/c/0093909becbda22b62b39b654dbc607faed59cd0","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/4a19bb1c45667f5a5f6eff9cf6648e0f692d046f","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/591acf171644de590cda245fd8595b473a1beb70","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/e148e567a9252643baa125cb65d7ae9c2c6cf68a","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"}],"tags":["nvd","cve.org"],"epss":0.00341,"epssPercentile":0.27461,"ingestedAt":"2026-09-24T16:47:15.903Z","slug":"CVE-2026-93786","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: preserve VFS inherited POSIX ACL mask\n\nThe VFS initializes a child's POSIX ACL from the parent's default ACL and\nthe requested creation mode. Do not mutate the parent ACL or overwrite the\nchild's VFS-computed access and default ACLs afterwards.\n\nThis preserves restrictive ACL_MASK entries and prevents SMB object creation\nfrom widening effective permissions.\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":45,"depthScoreParts":{"impact":44.6,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[{"seq":210541,"id":"CVE-2026-93786","ts":1790316054670,"field":"cvss","old":null,"new":"8.1"},{"seq":210540,"id":"CVE-2026-93786","ts":1790316054670,"field":"severity","old":"none","new":"high"}]}