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btrfs: reinitialize delayed ref list after deleting it from the list

Type: advisorySources: OSV

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.

Products
Kernel
Affected versions
Not specified
Fixed versions
4.19.324, 5.10.230, 5.15.172, 5.4.286, 6.1.117, 6.11.8, 6.6.61
CVEs
CVE-2024-50273
Confirmed fixed CVEs
Not specified
Updated in this feed
7 Nov 2026, 02:14 UTC · Revision 1

Source evidence

btrfs: reinitialize delayed ref list after deleting it from the list

core-osv · Original source

Published 19 Nov 2024, 01:30 UTC

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.

osv:CVE-2024-50273

Kernel

Fixed versions: 4.19.324, 5.4.286, 5.10.230, 5.15.172, 6.1.117, 6.6.61, 6.11.8

Complete source record
{
  "id": "29c9a0404422786b01ce59be9f8e4f5b532c36a409076543b6c55d52d6d28d39",
  "url": "https://osv.dev/vulnerability/CVE-2024-50273",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "btrfs: reinitialize delayed ref list after deleting it from the list",
    "summary": "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.",
    "evidence": "osv:CVE-2024-50273",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
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            "value": "4.19.324",
            "evidence": "/affected/1/ranges"
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            "evidence": "/affected/1/ranges"
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            "evidence": "/affected/1/ranges"
          },
          {
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            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.1.117",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.6.61",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.11.8",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "high",
    "structured": {
      "id": "CVE-2024-50273",
      "aliases": [
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      ],
      "metrics": [
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          "type": "CVSS_V3",
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                {
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                {
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        {
          "ranges": [
            {
              "type": "ECOSYSTEM",
              "events": [
                {
                  "introduced": "4.10.0"
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                {
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              ]
            },
            {
              "type": "ECOSYSTEM",
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                {
                  "introduced": "4.20.0"
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                {
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            {
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            },
            {
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      ],
      "modified": "2026-10-28T02:30:49.321521146Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/2cb1a73d1d44a1c11b0ee5eeced765dd80ec48e6",
        "https://git.kernel.org/stable/c/2fd0948a483e9cb2d669c7199bc620a21c97673d",
        "https://git.kernel.org/stable/c/50a3933760b427759afdd23156a7280a19357a92",
        "https://git.kernel.org/stable/c/93c5b8decc0ef39ba84f4211d2db6da0a4aefbeb",
        "https://git.kernel.org/stable/c/bf0b0c6d159767c0d1c21f793950d78486690ee0",
        "https://git.kernel.org/stable/c/c24fa427fc0ae827b2a3a07f13738cbf82c3f851",
        "https://git.kernel.org/stable/c/c9a75ec45f1111ef530ab186c2a7684d0a0c9245",
        "https://git.kernel.org/stable/c/f04be6d68f715c1473a8422fc0460f57b5e99931",
        "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html",
        "https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/50xxx/CVE-2024-50273.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2024-50273",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/50xxx/CVE-2024-50273.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2024-50273",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 517275,
  "published_at": "2024-11-19T01:30:12.589+00:00"
}