FKIE_CVE-2024-26960
Vulnerability from fkie_nvd - Published: 2024-05-01 06:15 - Updated: 2026-10-15 01:17
Severity
7.0 (High) - CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5 (Medium) - CVSS:3.1/
Summary
In the Linux kernel, the following vulnerability has been resolved:
mm: swap: fix race between free_swap_and_cache() and swapoff()
There was previously a theoretical window where swapoff() could run and
teardown a swap_info_struct while a call to free_swap_and_cache() was
running in another thread. This could cause, amongst other bad
possibilities, swap_page_trans_huge_swapped() (called by
free_swap_and_cache()) to access the freed memory for swap_map.
This is a theoretical problem and I haven't been able to provoke it from a
test case. But there has been agreement based on code review that this is
possible (see link below).
Fix it by using get_swap_device()/put_swap_device(), which will stall
swapoff(). There was an extra check in _swap_info_get() to confirm that
the swap entry was not free. This isn't present in get_swap_device()
because it doesn't make sense in general due to the race between getting
the reference and swapoff. So I've added an equivalent check directly in
free_swap_and_cache().
Details of how to provoke one possible issue (thanks to David Hildenbrand
for deriving this):
--8<-----
__swap_entry_free() might be the last user and result in
"count == SWAP_HAS_CACHE".
swapoff->try_to_unuse() will stop as soon as soon as si->inuse_pages==0.
So the question is: could someone reclaim the folio and turn
si->inuse_pages==0, before we completed swap_page_trans_huge_swapped().
Imagine the following: 2 MiB folio in the swapcache. Only 2 subpages are
still references by swap entries.
Process 1 still references subpage 0 via swap entry.
Process 2 still references subpage 1 via swap entry.
Process 1 quits. Calls free_swap_and_cache().
-> count == SWAP_HAS_CACHE
[then, preempted in the hypervisor etc.]
Process 2 quits. Calls free_swap_and_cache().
-> count == SWAP_HAS_CACHE
Process 2 goes ahead, passes swap_page_trans_huge_swapped(), and calls
__try_to_reclaim_swap().
__try_to_reclaim_swap()->folio_free_swap()->delete_from_swap_cache()->
put_swap_folio()->free_swap_slot()->swapcache_free_entries()->
swap_entry_free()->swap_range_free()->
...
WRITE_ONCE(si->inuse_pages, si->inuse_pages - nr_entries);
What stops swapoff to succeed after process 2 reclaimed the swap cache
but before process1 finished its call to swap_page_trans_huge_swapped()?
--8<-----
References
Impacted products
| Vendor | Product | Version | |
|---|---|---|---|
| linux | linux_kernel | * | |
| linux | linux_kernel | * | |
| linux | linux_kernel | * | |
| linux | linux_kernel | * | |
| linux | linux_kernel | * | |
| linux | linux_kernel | * | |
| debian | debian_linux | 10.0 |
{
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"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmm: swap: fix race between free_swap_and_cache() and swapoff()\n\nThere was previously a theoretical window where swapoff() could run and\nteardown a swap_info_struct while a call to free_swap_and_cache() was\nrunning in another thread. This could cause, amongst other bad\npossibilities, swap_page_trans_huge_swapped() (called by\nfree_swap_and_cache()) to access the freed memory for swap_map.\n\nThis is a theoretical problem and I haven\u0027t been able to provoke it from a\ntest case. But there has been agreement based on code review that this is\npossible (see link below).\n\nFix it by using get_swap_device()/put_swap_device(), which will stall\nswapoff(). There was an extra check in _swap_info_get() to confirm that\nthe swap entry was not free. This isn\u0027t present in get_swap_device()\nbecause it doesn\u0027t make sense in general due to the race between getting\nthe reference and swapoff. So I\u0027ve added an equivalent check directly in\nfree_swap_and_cache().\n\nDetails of how to provoke one possible issue (thanks to David Hildenbrand\nfor deriving this):\n\n--8\u003c-----\n\n__swap_entry_free() might be the last user and result in\n\"count == SWAP_HAS_CACHE\".\n\nswapoff-\u003etry_to_unuse() will stop as soon as soon as si-\u003einuse_pages==0.\n\nSo the question is: could someone reclaim the folio and turn\nsi-\u003einuse_pages==0, before we completed swap_page_trans_huge_swapped().\n\nImagine the following: 2 MiB folio in the swapcache. Only 2 subpages are\nstill references by swap entries.\n\nProcess 1 still references subpage 0 via swap entry.\nProcess 2 still references subpage 1 via swap entry.\n\nProcess 1 quits. Calls free_swap_and_cache().\n-\u003e count == SWAP_HAS_CACHE\n[then, preempted in the hypervisor etc.]\n\nProcess 2 quits. Calls free_swap_and_cache().\n-\u003e count == SWAP_HAS_CACHE\n\nProcess 2 goes ahead, passes swap_page_trans_huge_swapped(), and calls\n__try_to_reclaim_swap().\n\n__try_to_reclaim_swap()-\u003efolio_free_swap()-\u003edelete_from_swap_cache()-\u003e\nput_swap_folio()-\u003efree_swap_slot()-\u003eswapcache_free_entries()-\u003e\nswap_entry_free()-\u003eswap_range_free()-\u003e\n...\nWRITE_ONCE(si-\u003einuse_pages, si-\u003einuse_pages - nr_entries);\n\nWhat stops swapoff to succeed after process 2 reclaimed the swap cache\nbut before process1 finished its call to swap_page_trans_huge_swapped()?\n\n--8\u003c-----"
},
{
"lang": "es",
"value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: mm: swap: corrige la ejecuci\u00f3n entre free_swap_and_cache() y swapoff() Anteriormente exist\u00eda una ventana te\u00f3rica donde swapoff() pod\u00eda ejecutar y desmantelar un swap_info_struct mientras se realizaba una llamada a free_swap_and_cache(). corriendo en otro hilo. Esto podr\u00eda causar, entre otras malas posibilidades, que swap_page_trans_huge_swapped() (llamado por free_swap_and_cache()) acceda a la memoria liberada para swap_map. Este es un problema te\u00f3rico y no he podido provocarlo a partir de un caso de prueba. Pero ha habido un acuerdo basado en la revisi\u00f3n del c\u00f3digo de que esto es posible (ver enlace a continuaci\u00f3n). Solucionarlo usando get_swap_device()/put_swap_device(), lo que detendr\u00e1 swapoff(). Hubo una verificaci\u00f3n adicional en _swap_info_get() para confirmar que la entrada de intercambio no era gratuita. Esto no est\u00e1 presente en get_swap_device() porque en general no tiene sentido debido a la ejecuci\u00f3n entre obtener la referencia y el intercambio. As\u00ed que agregu\u00e9 una verificaci\u00f3n equivalente directamente en free_swap_and_cache(). Detalles de c\u00f3mo provocar un posible problema (gracias a David Hildenbrand por derivar esto): --8\u0026lt;----- __swap_entry_free() podr\u00eda ser el \u00faltimo usuario y dar como resultado \"count == SWAP_HAS_CACHE\". swapoff-\u0026gt;try_to_unuse() se detendr\u00e1 tan pronto como si-\u0026gt;inuse_pages==0. Entonces la pregunta es: \u00bfalguien podr\u00eda reclamar la publicaci\u00f3n y activar si-\u0026gt;inuse_pages==0, antes de que completemos swap_page_trans_huge_swapped()? Imagine lo siguiente: folio de 2 MiB en el swapcache. S\u00f3lo 2 subp\u00e1ginas siguen siendo referencias mediante entradas de intercambio. El proceso 1 todav\u00eda hace referencia a la subp\u00e1gina 0 mediante la entrada de intercambio. El proceso 2 todav\u00eda hace referencia a la subp\u00e1gina 1 mediante la entrada de intercambio. El proceso 1 se cierra. Llama a free_swap_and_cache(). -\u0026gt; count == SWAP_HAS_CACHE [luego, adelantado en el hipervisor, etc.] El proceso 2 se cierra. Llama a free_swap_and_cache(). -\u0026gt; count == SWAP_HAS_CACHE El proceso 2 contin\u00faa, pasa swap_page_trans_huge_swapped() y llama a __try_to_reclaim_swap(). __try_to_reclaim_swap()-\u0026gt;folio_free_swap()-\u0026gt;delete_from_swap_cache()-\u0026gt; put_swap_folio()-\u0026gt;free_swap_slot()-\u0026gt;swapcache_free_entries()-\u0026gt; swap_entry_free()-\u0026gt;swap_range_free()-\u0026gt; ... WRITE_ONCE(si-\u0026gt;inuse_pages, si-\u0026gt;inuse_pages - nr_entries); \u00bfQu\u00e9 impide que el intercambio tenga \u00e9xito despu\u00e9s de que el proceso 2 recuper\u00f3 el cach\u00e9 de intercambio pero antes de que el proceso 1 terminara su llamada a swap_page_trans_huge_swapped()? --8\u0026lt;-----"
}
],
"id": "CVE-2024-26960",
"lastModified": "2026-10-15T01:17:34.180",
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"role": "CISA Coordinator",
"timestamp": "2025-02-05T21:09:23.358079Z",
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"published": "2024-05-01T06:15:12.323",
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],
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},
{
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],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Modified",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-362"
}
],
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}
]
}
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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
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.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
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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.