{"id":"DEBIAN-CVE-2023-53832","details":"In the Linux kernel, the following vulnerability has been resolved:  md/raid10: fix null-ptr-deref in raid10_sync_request  init_resync() inits mempool and sets conf-\u003ehave_replacemnt at the beginning of sync, close_sync() frees the mempool when sync is completed.  After [1] recovery might be skipped and init_resync() is called but close_sync() is not. null-ptr-deref occurs with r10bio-\u003edev[i].repl_bio.  The following is one way to reproduce the issue.    1) create a array, wait for resync to complete, mddev-\u003erecovery_cp is set      to MaxSector.   2) recovery is woken and it is skipped. conf-\u003ehave_replacement is set to      0 in init_resync(). close_sync() not called.   3) some io errors and rdev A is set to WantReplacement.   4) a new device is added and set to A's replacement.   5) recovery is woken, A have replacement, but conf-\u003ehave_replacemnt is      0. r10bio-\u003edev[i].repl_bio will not be alloced and null-ptr-deref      occurs.  Fix it by not calling init_resync() if recovery skipped.  [1] commit 7e83ccbecd60 (\"md/raid10: Allow skipping recovery when clean arrays are assembled\")","modified":"2026-09-15T08:47:32.633497999Z","published":"2025-12-09T16:17:22.133Z","upstream":["CVE-2023-53832"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2023-53832"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:12","purl":"pkg:deb/debian/linux?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.1.37-1"}]}],"versions":["6.1.27-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2023-53832.json"}},{"package":{"name":"linux","ecosystem":"Debian:13","purl":"pkg:deb/debian/linux?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.3.7-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2023-53832.json"}},{"package":{"name":"linux","ecosystem":"Debian:14","purl":"pkg:deb/debian/linux?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"6.3.7-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2023-53832.json"}}],"schema_version":"1.9.0"}