{"id":"CVE-2023-52480","title":"In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix race condition between session lookup and expire\n\n Thread A                        +  Thread B\n ksmbd_session_lookup            |  smb2_sess_setup\n   sess = …","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix race condition between session lookup and expire\n\n Thread A                        +  Thread B\n ksmbd_session_lookup            |  smb2_sess_setup\n   sess = …","severity":"critical","cvss":9.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","cwe":["CWE-362"],"vendor":"linux","product":"linux_kernel","affected":["linux_kernel >= 5.15, < 5.15.145","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-2023-52480","references":[{"url":"https://git.kernel.org/stable/c/18ced78b0ebccc2d16f426143dc56ab3aad666be","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/53ff5cf89142b978b1a5ca8dc4d4425e6a09745f","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/a2ca5fd3dbcc665e1169044fa0c9e3eba779202b","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/c77fd3e25a51ac92b0f1b347a96eff6a0b4f066f","label":"416baaa9-dc9f-4396-8d5f-8c081fb06d67"},{"url":"https://git.kernel.org/stable/c/18ced78b0ebccc2d16f426143dc56ab3aad666be","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://git.kernel.org/stable/c/53ff5cf89142b978b1a5ca8dc4d4425e6a09745f","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://git.kernel.org/stable/c/a2ca5fd3dbcc665e1169044fa0c9e3eba779202b","label":"af854a3a-2127-422b-91ae-364da2661108"},{"url":"https://git.kernel.org/stable/c/c77fd3e25a51ac92b0f1b347a96eff6a0b4f066f","label":"af854a3a-2127-422b-91ae-364da2661108"}],"tags":["nvd"],"epss":0.00485,"epssPercentile":0.39119,"ingestedAt":"2026-08-04T10:39:39.686Z","slug":"CVE-2023-52480","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: fix race condition between session lookup and expire\n\n Thread A                        +  Thread B\n ksmbd_session_lookup            |  smb2_sess_setup\n   sess = xa_load                |\n                                 |\n                                 |    xa_erase(&conn->sessions, sess->id);\n                                 |\n                                 |    ksmbd_session_destroy(sess) --> kfree(sess)\n                                 |\n   // UAF!                       |\n   sess->last_active = jiffies   |\n                                 +\n\nThis patch add rwsem to fix race condition between ksmbd_session_lookup\nand ksmbd_expire_session.\n\n## Affected\n\n- `linux_kernel >= 5.15, < 5.15.145`\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":"midnight","depthScore":54,"depthScoreParts":{"impact":53.9,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}