ghsa-mf47-w2f7-gc7f
Vulnerability from github
In the Linux kernel, the following vulnerability has been resolved:
btrfs: reinitialize delayed ref list after deleting it from the list
At insert_delayed_ref() if we need to update the action of an existing ref to BTRFS_DROP_DELAYED_REF, we delete the ref from its ref head's ref_add_list using list_del(), which leaves the ref's add_list member not reinitialized, as list_del() sets the next and prev members of the list to LIST_POISON1 and LIST_POISON2, respectively.
If later we end up calling drop_delayed_ref() against the ref, which can happen during merging or when destroying delayed refs due to a transaction abort, we can trigger a crash since at drop_delayed_ref() we call list_empty() against the ref's add_list, which returns false since the list was not reinitialized after the list_del() and as a consequence we call list_del() again at drop_delayed_ref(). This results in an invalid list access since the next and prev members are set to poison pointers, resulting in a splat if CONFIG_LIST_HARDENED and CONFIG_DEBUG_LIST are set or invalid poison pointer dereferences otherwise.
So fix this by deleting from the list with list_del_init() instead.
{ affected: [], aliases: [ "CVE-2024-50273", ], database_specific: { cwe_ids: [ "CWE-908", ], github_reviewed: false, github_reviewed_at: null, nvd_published_at: "2024-11-19T02:16:29Z", severity: "MODERATE", }, 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.", id: "GHSA-mf47-w2f7-gc7f", modified: "2024-11-27T18:34:01Z", published: "2024-11-19T03:31:07Z", references: [ { type: "ADVISORY", url: "https://nvd.nist.gov/vuln/detail/CVE-2024-50273", }, { 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", }, ], schema_version: "1.4.0", severity: [ { score: "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", type: "CVSS_V3", }, ], }
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