{"id":"DEBIAN-CVE-2023-53608","details":"In the Linux kernel, the following vulnerability has been resolved:  nilfs2: fix potential UAF of struct nilfs_sc_info in nilfs_segctor_thread()  The finalization of nilfs_segctor_thread() can race with nilfs_segctor_kill_thread() which terminates that thread, potentially causing a use-after-free BUG as KASAN detected.  At the end of nilfs_segctor_thread(), it assigns NULL to \"sc_task\" member of \"struct nilfs_sc_info\" to indicate the thread has finished, and then notifies nilfs_segctor_kill_thread() of this using waitqueue \"sc_wait_task\" on the struct nilfs_sc_info.  However, here, immediately after the NULL assignment to \"sc_task\", it is possible that nilfs_segctor_kill_thread() will detect it and return to continue the deallocation, freeing the nilfs_sc_info structure before the thread does the notification.  This fixes the issue by protecting the NULL assignment to \"sc_task\" and its notification, with spinlock \"sc_state_lock\" of the struct nilfs_sc_info.  Since nilfs_segctor_kill_thread() does a final check to see if \"sc_task\" is NULL with \"sc_state_lock\" locked, this can eliminate the race.","modified":"2026-09-15T09:02:51.754669022Z","published":"2025-10-04T16:15:57.527Z","upstream":["CVE-2023-53608"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2023-53608"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:12","purl":"pkg:deb/debian/linux?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.1.25-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2023-53608.json"}},{"package":{"name":"linux","ecosystem":"Debian:13","purl":"pkg:deb/debian/linux?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.1.25-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2023-53608.json"}},{"package":{"name":"linux","ecosystem":"Debian:14","purl":"pkg:deb/debian/linux?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.1.25-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2023-53608.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}