CVE-2024-50273 (GCVE-0-2024-50273)
Vulnerability from cvelistv5 – Published: 2024-11-19 01:30 – Updated: 2026-08-05 11:42
VLAI
EPSS
VEX
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.
Severity
7.8 (High)
5.5 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2025-10-01 20:14 UTC
CWE
- CWE-908 - Use of Uninitialized Resource
Assigner
References
10 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
1d57ee941692d0cc928526e21a1557b2ae3e11db , < 2fd0948a483e9cb2d669c7199bc620a21c97673d
(git)
Affected: 1d57ee941692d0cc928526e21a1557b2ae3e11db , < 93c5b8decc0ef39ba84f4211d2db6da0a4aefbeb (git) Affected: 1d57ee941692d0cc928526e21a1557b2ae3e11db , < bf0b0c6d159767c0d1c21f793950d78486690ee0 (git) Affected: 1d57ee941692d0cc928526e21a1557b2ae3e11db , < c24fa427fc0ae827b2a3a07f13738cbf82c3f851 (git) Affected: 1d57ee941692d0cc928526e21a1557b2ae3e11db , < 2cb1a73d1d44a1c11b0ee5eeced765dd80ec48e6 (git) Affected: 1d57ee941692d0cc928526e21a1557b2ae3e11db , < f04be6d68f715c1473a8422fc0460f57b5e99931 (git) Affected: 1d57ee941692d0cc928526e21a1557b2ae3e11db , < 50a3933760b427759afdd23156a7280a19357a92 (git) Affected: 1d57ee941692d0cc928526e21a1557b2ae3e11db , < c9a75ec45f1111ef530ab186c2a7684d0a0c9245 (git) |
guessed | |
| Linux | Linux |
Affected:
4.10
Unaffected: 0 , < 4.10 (semver) Unaffected: 4.19.324 , ≤ 4.19.* (semver) Unaffected: 5.4.286 , ≤ 5.4.* (semver) Unaffected: 5.10.230 , ≤ 5.10.* (semver) Unaffected: 5.15.172 , ≤ 5.15.* (semver) Unaffected: 6.1.117 , ≤ 6.1.* (semver) Unaffected: 6.6.61 , ≤ 6.6.* (semver) Unaffected: 6.11.8 , ≤ 6.11.* (semver) Unaffected: 6.12 , ≤ * (original_commit_for_fix) |
guessed |
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"lang": "en",
"value": "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\u0027s\nref_add_list using list_del(), which leaves the ref\u0027s 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\u0027s 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."
},
{
"lang": "es",
"value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: btrfs: reinicializar la lista de referencias retrasadas despu\u00e9s de eliminarla de la lista En insert_delayed_ref(), si necesitamos actualizar la acci\u00f3n de una referencia existente a BTRFS_DROP_DELAYED_REF, eliminamos la referencia de ref_add_list de su cabecera de referencia usando list_del(), lo que deja el miembro add_list de la referencia sin reinicializar, ya que list_del() establece los miembros siguiente y anterior de la lista en LIST_POISON1 y LIST_POISON2, respectivamente. Si m\u00e1s tarde terminamos llamando a drop_delayed_ref() contra la referencia, lo que puede suceder durante la fusi\u00f3n o al destruir referencias retrasadas debido a un aborto de transacci\u00f3n, podemos provocar un bloqueo ya que en drop_delayed_ref() llamamos a list_empty() contra el add_list de la referencia, que devuelve falso ya que la lista no se reinicializ\u00f3 despu\u00e9s de list_del() y, como consecuencia, llamamos a list_del() nuevamente en drop_delayed_ref(). Esto da como resultado un acceso a la lista no v\u00e1lido ya que los miembros next y prev est\u00e1n configurados como punteros envenenados, lo que resulta en un splat si CONFIG_LIST_HARDENED y CONFIG_DEBUG_LIST est\u00e1n configurados o desreferencias de punteros envenenados no v\u00e1lidas en caso contrario. As\u00ed que solucione esto eliminando de la lista con list_del_init() en su lugar."
}
],
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"title": "kernel: btrfs: reinitialize delayed ref list after deleting it from the list",
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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