{"id":"CVE-2024-50273","summary":"btrfs: reinitialize delayed ref list after deleting it from the list","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: reinitialize delayed ref list after deleting it from the list\n\nAt insert_delayed_ref() if we need to update the action of an existing\nref to BTRFS_DROP_DELAYED_REF, we delete the ref from its ref head's\nref_add_list using list_del(), which leaves the ref's add_list member\nnot reinitialized, as list_del() sets the next and prev members of the\nlist to LIST_POISON1 and LIST_POISON2, respectively.\n\nIf later we end up calling drop_delayed_ref() against the ref, which can\nhappen during merging or when destroying delayed refs due to a transaction\nabort, we can trigger a crash since at drop_delayed_ref() we call\nlist_empty() against the ref's add_list, which returns false since\nthe list was not reinitialized after the list_del() and as a consequence\nwe call list_del() again at drop_delayed_ref(). This results in an\ninvalid list access since the next and prev members are set to poison\npointers, resulting in a splat if CONFIG_LIST_HARDENED and\nCONFIG_DEBUG_LIST are set or invalid poison pointer dereferences\notherwise.\n\nSo fix this by deleting from the list with list_del_init() instead.","modified":"2026-04-02T12:21:22.715468Z","published":"2024-11-19T01:30:12.589Z","related":["SUSE-SU-2024:4314-1","SUSE-SU-2024:4315-1","SUSE-SU-2024:4316-1","SUSE-SU-2024:4318-1","SUSE-SU-2024:4364-1","SUSE-SU-2024:4367-1","SUSE-SU-2024:4376-1","SUSE-SU-2024:4387-1","SUSE-SU-2025:0035-1","SUSE-SU-2025:20163-1","SUSE-SU-2025:20164-1","SUSE-SU-2025:20246-1","SUSE-SU-2025:20247-1","USN-7276-1","USN-7277-1"],"database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/50xxx/CVE-2024-50273.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/2cb1a73d1d44a1c11b0ee5eeced765dd80ec48e6"},{"type":"WEB","url":"https://git.kernel.org/stable/c/2fd0948a483e9cb2d669c7199bc620a21c97673d"},{"type":"WEB","url":"https://git.kernel.org/stable/c/50a3933760b427759afdd23156a7280a19357a92"},{"type":"WEB","url":"https://git.kernel.org/stable/c/93c5b8decc0ef39ba84f4211d2db6da0a4aefbeb"},{"type":"WEB","url":"https://git.kernel.org/stable/c/bf0b0c6d159767c0d1c21f793950d78486690ee0"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c24fa427fc0ae827b2a3a07f13738cbf82c3f851"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c9a75ec45f1111ef530ab186c2a7684d0a0c9245"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f04be6d68f715c1473a8422fc0460f57b5e99931"},{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html"},{"type":"WEB","url":"https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/50xxx/CVE-2024-50273.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2024-50273"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"1d57ee941692d0cc928526e21a1557b2ae3e11db"},{"fixed":"2fd0948a483e9cb2d669c7199bc620a21c97673d"},{"fixed":"93c5b8decc0ef39ba84f4211d2db6da0a4aefbeb"},{"fixed":"bf0b0c6d159767c0d1c21f793950d78486690ee0"},{"fixed":"c24fa427fc0ae827b2a3a07f13738cbf82c3f851"},{"fixed":"2cb1a73d1d44a1c11b0ee5eeced765dd80ec48e6"},{"fixed":"f04be6d68f715c1473a8422fc0460f57b5e99931"},{"fixed":"50a3933760b427759afdd23156a7280a19357a92"},{"fixed":"c9a75ec45f1111ef530ab186c2a7684d0a0c9245"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2024-50273.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"}]}