fkie_cve-2025-39711
Vulnerability from fkie_nvd
Published
2025-09-05 18:15
Modified
2025-11-25 21:16
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
media: ivsc: Fix crash at shutdown due to missing mei_cldev_disable() calls
Both the ACE and CSI driver are missing a mei_cldev_disable() call in
their remove() function.
This causes the mei_cl client to stay part of the mei_device->file_list
list even though its memory is freed by mei_cl_bus_dev_release() calling
kfree(cldev->cl).
This leads to a use-after-free when mei_vsc_remove() runs mei_stop()
which first removes all mei bus devices calling mei_ace_remove() and
mei_csi_remove() followed by mei_cl_bus_dev_release() and then calls
mei_cl_all_disconnect() which walks over mei_device->file_list dereferecing
the just freed cldev->cl.
And mei_vsc_remove() it self is run at shutdown because of the
platform_device_unregister(tp->pdev) in vsc_tp_shutdown()
When building a kernel with KASAN this leads to the following KASAN report:
[ 106.634504] ==================================================================
[ 106.634623] BUG: KASAN: slab-use-after-free in mei_cl_set_disconnected (drivers/misc/mei/client.c:783) mei
[ 106.634683] Read of size 4 at addr ffff88819cb62018 by task systemd-shutdow/1
[ 106.634729]
[ 106.634767] Tainted: [E]=UNSIGNED_MODULE
[ 106.634770] Hardware name: Dell Inc. XPS 16 9640/09CK4V, BIOS 1.12.0 02/10/2025
[ 106.634773] Call Trace:
[ 106.634777] <TASK>
...
[ 106.634871] kasan_report (mm/kasan/report.c:221 mm/kasan/report.c:636)
[ 106.634901] mei_cl_set_disconnected (drivers/misc/mei/client.c:783) mei
[ 106.634921] mei_cl_all_disconnect (drivers/misc/mei/client.c:2165 (discriminator 4)) mei
[ 106.634941] mei_reset (drivers/misc/mei/init.c:163) mei
...
[ 106.635042] mei_stop (drivers/misc/mei/init.c:348) mei
[ 106.635062] mei_vsc_remove (drivers/misc/mei/mei_dev.h:784 drivers/misc/mei/platform-vsc.c:393) mei_vsc
[ 106.635066] platform_remove (drivers/base/platform.c:1424)
Add the missing mei_cldev_disable() calls so that the mei_cl gets removed
from mei_device->file_list before it is freed to fix this.
References
Impacted products
| Vendor | Product | Version | |
|---|---|---|---|
| linux | linux_kernel | * | |
| linux | linux_kernel | * | |
| linux | linux_kernel | * |
{
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"versionStartIncluding": "6.6",
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"cveTags": [],
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmedia: ivsc: Fix crash at shutdown due to missing mei_cldev_disable() calls\n\nBoth the ACE and CSI driver are missing a mei_cldev_disable() call in\ntheir remove() function.\n\nThis causes the mei_cl client to stay part of the mei_device-\u003efile_list\nlist even though its memory is freed by mei_cl_bus_dev_release() calling\nkfree(cldev-\u003ecl).\n\nThis leads to a use-after-free when mei_vsc_remove() runs mei_stop()\nwhich first removes all mei bus devices calling mei_ace_remove() and\nmei_csi_remove() followed by mei_cl_bus_dev_release() and then calls\nmei_cl_all_disconnect() which walks over mei_device-\u003efile_list dereferecing\nthe just freed cldev-\u003ecl.\n\nAnd mei_vsc_remove() it self is run at shutdown because of the\nplatform_device_unregister(tp-\u003epdev) in vsc_tp_shutdown()\n\nWhen building a kernel with KASAN this leads to the following KASAN report:\n\n[ 106.634504] ==================================================================\n[ 106.634623] BUG: KASAN: slab-use-after-free in mei_cl_set_disconnected (drivers/misc/mei/client.c:783) mei\n[ 106.634683] Read of size 4 at addr ffff88819cb62018 by task systemd-shutdow/1\n[ 106.634729]\n[ 106.634767] Tainted: [E]=UNSIGNED_MODULE\n[ 106.634770] Hardware name: Dell Inc. XPS 16 9640/09CK4V, BIOS 1.12.0 02/10/2025\n[ 106.634773] Call Trace:\n[ 106.634777] \u003cTASK\u003e\n...\n[ 106.634871] kasan_report (mm/kasan/report.c:221 mm/kasan/report.c:636)\n[ 106.634901] mei_cl_set_disconnected (drivers/misc/mei/client.c:783) mei\n[ 106.634921] mei_cl_all_disconnect (drivers/misc/mei/client.c:2165 (discriminator 4)) mei\n[ 106.634941] mei_reset (drivers/misc/mei/init.c:163) mei\n...\n[ 106.635042] mei_stop (drivers/misc/mei/init.c:348) mei\n[ 106.635062] mei_vsc_remove (drivers/misc/mei/mei_dev.h:784 drivers/misc/mei/platform-vsc.c:393) mei_vsc\n[ 106.635066] platform_remove (drivers/base/platform.c:1424)\n\nAdd the missing mei_cldev_disable() calls so that the mei_cl gets removed\nfrom mei_device-\u003efile_list before it is freed to fix this."
}
],
"id": "CVE-2025-39711",
"lastModified": "2025-11-25T21:16:06.437",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.8,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"exploitabilityScore": 1.8,
"impactScore": 5.9,
"source": "nvd@nist.gov",
"type": "Primary"
}
]
},
"published": "2025-09-05T18:15:48.470",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
"Patch"
],
"url": "https://git.kernel.org/stable/c/0c92c49fc688cfadacc47ae99b06a31237702e9e"
},
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"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"url": "https://git.kernel.org/stable/c/639f5b33fcd7c59157f29b09f6f2866eacf9279c"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Analyzed",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-416"
}
],
"source": "nvd@nist.gov",
"type": "Primary"
}
]
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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