FKIE_CVE-2025-39691
Vulnerability from fkie_nvd - Published: 2025-09-05 18:15 - Updated: 2026-10-19 21:10
Severity
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8 (High) - CVSS:3.1/
Summary
In the Linux kernel, the following vulnerability has been resolved:
fs/buffer: fix use-after-free when call bh_read() helper
There's issue as follows:
BUG: KASAN: stack-out-of-bounds in end_buffer_read_sync+0xe3/0x110
Read of size 8 at addr ffffc9000168f7f8 by task swapper/3/0
CPU: 3 UID: 0 PID: 0 Comm: swapper/3 Not tainted 6.16.0-862.14.0.6.x86_64
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996)
Call Trace:
<IRQ>
dump_stack_lvl+0x55/0x70
print_address_description.constprop.0+0x2c/0x390
print_report+0xb4/0x270
kasan_report+0xb8/0xf0
end_buffer_read_sync+0xe3/0x110
end_bio_bh_io_sync+0x56/0x80
blk_update_request+0x30a/0x720
scsi_end_request+0x51/0x2b0
scsi_io_completion+0xe3/0x480
? scsi_device_unbusy+0x11e/0x160
blk_complete_reqs+0x7b/0x90
handle_softirqs+0xef/0x370
irq_exit_rcu+0xa5/0xd0
sysvec_apic_timer_interrupt+0x6e/0x90
</IRQ>
Above issue happens when do ntfs3 filesystem mount, issue may happens
as follows:
mount IRQ
ntfs_fill_super
read_cache_page
do_read_cache_folio
filemap_read_folio
mpage_read_folio
do_mpage_readpage
ntfs_get_block_vbo
bh_read
submit_bh
wait_on_buffer(bh);
blk_complete_reqs
scsi_io_completion
scsi_end_request
blk_update_request
end_bio_bh_io_sync
end_buffer_read_sync
__end_buffer_read_notouch
unlock_buffer
wait_on_buffer(bh);--> return will return to caller
put_bh
--> trigger stack-out-of-bounds
In the mpage_read_folio() function, the stack variable 'map_bh' is
passed to ntfs_get_block_vbo(). Once unlock_buffer() unlocks and
wait_on_buffer() returns to continue processing, the stack variable
is likely to be reclaimed. Consequently, during the end_buffer_read_sync()
process, calling put_bh() may result in stack overrun.
If the bh is not allocated on the stack, it belongs to a folio. Freeing
a buffer head which belongs to a folio is done by drop_buffers() which
will fail to free buffers which are still locked. So it is safe to call
put_bh() before __end_buffer_read_notouch().
References
Impacted products
| Vendor | Product | Version | |
|---|---|---|---|
| linux | linux_kernel | * | |
| linux | linux_kernel | * | |
| linux | linux_kernel | * | |
| linux | linux_kernel | * | |
| linux | linux_kernel | * | |
| linux | linux_kernel | * | |
| linux | linux_kernel | * | |
| linux | linux_kernel | 2.6.12 | |
| linux | linux_kernel | 2.6.12 | |
| linux | linux_kernel | 2.6.12 | |
| linux | linux_kernel | 2.6.12 | |
| linux | linux_kernel | 2.6.12 | |
| linux | linux_kernel | 6.17 | |
| linux | linux_kernel | 6.17 | |
| debian | debian_linux | 11.0 |
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"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfs/buffer: fix use-after-free when call bh_read() helper\n\nThere\u0027s issue as follows:\nBUG: KASAN: stack-out-of-bounds in end_buffer_read_sync+0xe3/0x110\nRead of size 8 at addr ffffc9000168f7f8 by task swapper/3/0\nCPU: 3 UID: 0 PID: 0 Comm: swapper/3 Not tainted 6.16.0-862.14.0.6.x86_64\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996)\nCall Trace:\n \u003cIRQ\u003e\n dump_stack_lvl+0x55/0x70\n print_address_description.constprop.0+0x2c/0x390\n print_report+0xb4/0x270\n kasan_report+0xb8/0xf0\n end_buffer_read_sync+0xe3/0x110\n end_bio_bh_io_sync+0x56/0x80\n blk_update_request+0x30a/0x720\n scsi_end_request+0x51/0x2b0\n scsi_io_completion+0xe3/0x480\n ? scsi_device_unbusy+0x11e/0x160\n blk_complete_reqs+0x7b/0x90\n handle_softirqs+0xef/0x370\n irq_exit_rcu+0xa5/0xd0\n sysvec_apic_timer_interrupt+0x6e/0x90\n \u003c/IRQ\u003e\n\n Above issue happens when do ntfs3 filesystem mount, issue may happens\n as follows:\n mount IRQ\nntfs_fill_super\n read_cache_page\n do_read_cache_folio\n filemap_read_folio\n mpage_read_folio\n\t do_mpage_readpage\n\t ntfs_get_block_vbo\n\t bh_read\n\t submit_bh\n\t wait_on_buffer(bh);\n\t blk_complete_reqs\n\t\t\t\t scsi_io_completion\n\t\t\t\t scsi_end_request\n\t\t\t\t blk_update_request\n\t\t\t\t end_bio_bh_io_sync\n\t\t\t\t\t end_buffer_read_sync\n\t\t\t\t\t __end_buffer_read_notouch\n\t\t\t\t\t unlock_buffer\n\n wait_on_buffer(bh);--\u003e return will return to caller\n\n\t\t\t\t\t put_bh\n\t\t\t\t\t --\u003e trigger stack-out-of-bounds\nIn the mpage_read_folio() function, the stack variable \u0027map_bh\u0027 is\npassed to ntfs_get_block_vbo(). Once unlock_buffer() unlocks and\nwait_on_buffer() returns to continue processing, the stack variable\nis likely to be reclaimed. Consequently, during the end_buffer_read_sync()\nprocess, calling put_bh() may result in stack overrun.\n\nIf the bh is not allocated on the stack, it belongs to a folio. Freeing\na buffer head which belongs to a folio is done by drop_buffers() which\nwill fail to free buffers which are still locked. So it is safe to call\nput_bh() before __end_buffer_read_notouch()."
},
{
"lang": "es",
"value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nfs/buffer: corrige el uso despu\u00e9s de liberaci\u00f3n al llamar a la funci\u00f3n auxiliar bh_read()\n\nExiste un problema como sigue:\nERROR: KASAN: desbordamiento de pila en end_buffer_read_sync+0xe3/0x110\nLectura de tama\u00f1o 8 en la direcci\u00f3n ffffc9000168f7f8 por la tarea swapper/3/0\nCPU: 3 UID: 0 PID: 0 Comm: swapper/3 No contaminado 6.16.0-862.14.0.6.x86_64\nNombre del hardware: QEMU Standard PC (i440FX + PIIX, 1996)\nTraza de llamada:\n \u003cIRQ\u003e\n dump_stack_lvl+0x55/0x70\n print_address_description.constprop.0+0x2c/0x390\n print_report+0xb4/0x270\n kasan_report+0xb8/0xf0\n end_buffer_read_sync+0xe3/0x110\n end_bio_bh_io_sync+0x56/0x80\n blk_update_request+0x30a/0x720\n scsi_end_request+0x51/0x2b0\n scsi_io_completion+0xe3/0x480\n ? scsi_device_unbusy+0x11e/0x160\n blk_complete_reqs+0x7b/0x90\n handle_softirqs+0xef/0x370\n irq_exit_rcu+0xa5/0xd0\n sysvec_apic_timer_interrupt+0x6e/0x90\n \u003c/IRQ\u003e\n\nEl problema anterior ocurre al montar el sistema de archivos ntfs3, el problema puede ocurrir de la siguiente manera:\n montar IRQ\nntfs_fill_super\n read_cache_page\n do_read_cache_folio\n filemap_read_folio\n mpage_read_folio\n\t do_mpage_readpage\n\t ntfs_get_block_vbo\n\t bh_read\n\t submit_bh\n\t wait_on_buffer(bh);\n\t blk_complete_reqs\n\t\t\t\t scsi_io_completion\n\t\t\t\t scsi_end_request\n\t\t\t\t blk_update_request\n\t\t\t\t end_bio_bh_io_sync\n\t\t\t\t\t end_buffer_read_sync\n\t\t\t\t\t __end_buffer_read_notouch\n\t\t\t\t\t unlock_buffer\n\n wait_on_buffer(bh);--\u003e el retorno volver\u00e1 al llamador\n\n\t\t\t\t\t put_bh\n\t\t\t\t\t --\u003e desencadena el desbordamiento de pila\nEn la funci\u00f3n mpage_read_folio(), la variable de pila map_bh se pasa a ntfs_get_block_vbo(). Una vez que unlock_buffer() desbloquea y wait_on_buffer() regresa para continuar el procesamiento, es probable que la variable de pila sea reclamada. En consecuencia, durante el proceso de end_buffer_read_sync(), llamar a put_bh() puede resultar en un desbordamiento de pila.\n\nSi el bh no se asigna en la pila, pertenece a un folio. La liberaci\u00f3n de una cabecera de b\u00fafer que pertenece a un folio se realiza mediante drop_buffers(), que fallar\u00e1 al liberar los b\u00faferes que a\u00fan est\u00e1n bloqueados. Por lo tanto, es seguro llamar a put_bh() antes de __end_buffer_read_notouch()."
}
],
"id": "CVE-2025-39691",
"lastModified": "2026-10-19T21:10:00.160",
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"role": "CISA Coordinator",
"timestamp": "2026-10-15T21:53:28.798448Z",
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"published": "2025-09-05T18:15:45.840",
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"tags": [
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},
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},
{
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],
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},
{
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],
"url": "https://git.kernel.org/stable/c/70a09115da586bf662c3bae9c0c4a1b99251fad9"
},
{
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"url": "https://git.kernel.org/stable/c/7375f22495e7cd1c5b3b5af9dcc4f6dffe34ce49"
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{
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},
{
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],
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},
{
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],
"url": "https://git.kernel.org/stable/c/c5aa6ba1127307ab5dc3773eaf40d73a3423841f"
},
{
"source": "af854a3a-2127-422b-91ae-364da2661108",
"tags": [
"Mailing List",
"Third Party Advisory"
],
"url": "https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html"
},
{
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"tags": [
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],
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},
{
"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e",
"url": "https://cert-portal.siemens.com/productcert/html/ssa-019113.html"
},
{
"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e",
"url": "https://cert-portal.siemens.com/productcert/html/ssa-032379.html"
},
{
"source": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e",
"url": "https://cert-portal.siemens.com/productcert/html/ssa-457936.html"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Modified",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-416"
}
],
"source": "nvd@nist.gov",
"type": "Primary"
}
]
}
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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.