{"id":"CVE-2023-52479","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix uaf in smb20_oplock_break_ack\n\ndrop reference after use opinfo.","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix uaf in smb20_oplock_break_ack\n\ndrop reference after use opinfo.","severity":"high","cvss":8.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cwe":["CWE-416"],"vendor":"linux","product":"linux_kernel","affected":["linux_kernel < 5.15.135","linux_kernel >= 5.16, < 6.1.57","linux_kernel >= 6.2, < 6.5.7","linux_kernel = 6.6"],"patched":["linux_kernel 6.5.7"],"published":"2024-02-29","updated":"2026-08-04","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2023-52479","references":[{"url":"https://git.kernel.org/stable/c/694e13732e830cbbfedb562e57f28644927c33fd","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/8226ffc759ea59f10067b9acdf7f94bae1c69930","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/c69813471a1ec081a0b9bf0c6bd7e8afd818afce","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/d5b0e9d3563e7e314a850e81f42b2ef6f39882f9","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/694e13732e830cbbfedb562e57f28644927c33fd","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://git.kernel.org/stable/c/8226ffc759ea59f10067b9acdf7f94bae1c69930","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://git.kernel.org/stable/c/c69813471a1ec081a0b9bf0c6bd7e8afd818afce","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://git.kernel.org/stable/c/d5b0e9d3563e7e314a850e81f42b2ef6f39882f9","label":"af854a3a-2127-422b-91ae-364da2661108"}],"tags":["nvd"],"epss":0.00603,"epssPercentile":0.4756,"ingestedAt":"2026-08-04T10:39:39.655Z","slug":"CVE-2023-52479","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix uaf in smb20_oplock_break_ack\n\ndrop reference after use opinfo.\n\n## Affected\n\n- `linux_kernel < 5.15.135`\n- `linux_kernel >= 5.16, < 6.1.57`\n- `linux_kernel >= 6.2, < 6.5.7`\n- `linux_kernel = 6.6`\n\n## Remediation\n\nUpgrade past the affected range:\n\n- `linux_kernel 6.5.7`","depth":"twilight","depthScore":49,"depthScoreParts":{"impact":48.4,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}