fkie_cve-2025-39711
Vulnerability from fkie_nvd
Published
2025-09-05 18:15
Modified
2025-09-08 16:25
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
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0c92c49fc688cfadacc47ae99b06a31237702e9e
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1dfe73394dcfc9b049c8da0dc181c45f156a5f49
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3c0e4cc4f55f9a1db2a761e4ffb27c9594245888
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/639f5b33fcd7c59157f29b09f6f2866eacf9279c
Impacted products
Vendor Product Version


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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": "2025-09-08T16:25:38.810",
  "metrics": {},
  "published": "2025-09-05T18:15:48.470",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/0c92c49fc688cfadacc47ae99b06a31237702e9e"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/1dfe73394dcfc9b049c8da0dc181c45f156a5f49"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/3c0e4cc4f55f9a1db2a761e4ffb27c9594245888"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/639f5b33fcd7c59157f29b09f6f2866eacf9279c"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Awaiting Analysis"
}


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