fkie_cve-2022-48869
Vulnerability from fkie_nvd
Published
2024-08-21 07:15
Modified
2024-09-06 14:19
Severity ?
4.7 (Medium) - CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: USB: gadgetfs: Fix race between mounting and unmounting The syzbot fuzzer and Gerald Lee have identified a use-after-free bug in the gadgetfs driver, involving processes concurrently mounting and unmounting the gadgetfs filesystem. In particular, gadgetfs_fill_super() can race with gadgetfs_kill_sb(), causing the latter to deallocate the_device while the former is using it. The output from KASAN says, in part: BUG: KASAN: use-after-free in instrument_atomic_read_write include/linux/instrumented.h:102 [inline] BUG: KASAN: use-after-free in atomic_fetch_sub_release include/linux/atomic/atomic-instrumented.h:176 [inline] BUG: KASAN: use-after-free in __refcount_sub_and_test include/linux/refcount.h:272 [inline] BUG: KASAN: use-after-free in __refcount_dec_and_test include/linux/refcount.h:315 [inline] BUG: KASAN: use-after-free in refcount_dec_and_test include/linux/refcount.h:333 [inline] BUG: KASAN: use-after-free in put_dev drivers/usb/gadget/legacy/inode.c:159 [inline] BUG: KASAN: use-after-free in gadgetfs_kill_sb+0x33/0x100 drivers/usb/gadget/legacy/inode.c:2086 Write of size 4 at addr ffff8880276d7840 by task syz-executor126/18689 CPU: 0 PID: 18689 Comm: syz-executor126 Not tainted 6.1.0-syzkaller #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022 Call Trace: <TASK> ... atomic_fetch_sub_release include/linux/atomic/atomic-instrumented.h:176 [inline] __refcount_sub_and_test include/linux/refcount.h:272 [inline] __refcount_dec_and_test include/linux/refcount.h:315 [inline] refcount_dec_and_test include/linux/refcount.h:333 [inline] put_dev drivers/usb/gadget/legacy/inode.c:159 [inline] gadgetfs_kill_sb+0x33/0x100 drivers/usb/gadget/legacy/inode.c:2086 deactivate_locked_super+0xa7/0xf0 fs/super.c:332 vfs_get_super fs/super.c:1190 [inline] get_tree_single+0xd0/0x160 fs/super.c:1207 vfs_get_tree+0x88/0x270 fs/super.c:1531 vfs_fsconfig_locked fs/fsopen.c:232 [inline] The simplest solution is to ensure that gadgetfs_fill_super() and gadgetfs_kill_sb() are serialized by making them both acquire a new mutex.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/616fd34d017000ecf9097368b13d8a266f4920b3Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/856e4b5e53f21edbd15d275dde62228dd94fb2b4Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9a39f4626b361ee7aa10fd990401c37ec3b466aePatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/a2e075f40122d8daf587db126c562a67abd69cf9Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d18dcfe9860e842f394e37ba01ca9440ab2178f4Patch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *


To clipboard 

{
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    {
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        {
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              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "D96CFFAF-9D69-4742-997E-484E7278F62E",
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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nUSB: gadgetfs: Fix race between mounting and unmounting\n\nThe syzbot fuzzer and Gerald Lee have identified a use-after-free bug\nin the gadgetfs driver, involving processes concurrently mounting and\nunmounting the gadgetfs filesystem.  In particular, gadgetfs_fill_super()\ncan race with gadgetfs_kill_sb(), causing the latter to deallocate\nthe_device while the former is using it.  The output from KASAN says,\nin part:\n\nBUG: KASAN: use-after-free in instrument_atomic_read_write include/linux/instrumented.h:102 [inline]\nBUG: KASAN: use-after-free in atomic_fetch_sub_release include/linux/atomic/atomic-instrumented.h:176 [inline]\nBUG: KASAN: use-after-free in __refcount_sub_and_test include/linux/refcount.h:272 [inline]\nBUG: KASAN: use-after-free in __refcount_dec_and_test include/linux/refcount.h:315 [inline]\nBUG: KASAN: use-after-free in refcount_dec_and_test include/linux/refcount.h:333 [inline]\nBUG: KASAN: use-after-free in put_dev drivers/usb/gadget/legacy/inode.c:159 [inline]\nBUG: KASAN: use-after-free in gadgetfs_kill_sb+0x33/0x100 drivers/usb/gadget/legacy/inode.c:2086\nWrite of size 4 at addr ffff8880276d7840 by task syz-executor126/18689\n\nCPU: 0 PID: 18689 Comm: syz-executor126 Not tainted 6.1.0-syzkaller #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/26/2022\nCall Trace:\n \u003cTASK\u003e\n...\n atomic_fetch_sub_release include/linux/atomic/atomic-instrumented.h:176 [inline]\n __refcount_sub_and_test include/linux/refcount.h:272 [inline]\n __refcount_dec_and_test include/linux/refcount.h:315 [inline]\n refcount_dec_and_test include/linux/refcount.h:333 [inline]\n put_dev drivers/usb/gadget/legacy/inode.c:159 [inline]\n gadgetfs_kill_sb+0x33/0x100 drivers/usb/gadget/legacy/inode.c:2086\n deactivate_locked_super+0xa7/0xf0 fs/super.c:332\n vfs_get_super fs/super.c:1190 [inline]\n get_tree_single+0xd0/0x160 fs/super.c:1207\n vfs_get_tree+0x88/0x270 fs/super.c:1531\n vfs_fsconfig_locked fs/fsopen.c:232 [inline]\n\nThe simplest solution is to ensure that gadgetfs_fill_super() and\ngadgetfs_kill_sb() are serialized by making them both acquire a new\nmutex."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: USB: gadgetfs: corrige la ejecuci\u00f3n entre montar y desmontar Syzbot fuzzer y Gerald Lee han identificado un error de use-after-free en el controlador gadgetfs, que involucra procesos que montan y desmontan simult\u00e1neamente los gadgetfs. sistema de archivos. En particular, gadgetfs_fill_super() puede competir con gadgetfs_kill_sb(), provocando que este \u00faltimo desasigne the_device mientras el primero lo est\u00e1 usando. El resultado de KASAN dice, en parte: ERROR: KASAN: use-after-free en instrument_atomic_read_write include/linux/instrumented.h:102 [en l\u00ednea] ERROR: KASAN: use-after-free en atomic_fetch_sub_release include/linux/atomic/atomic -instrumented.h:176 [en l\u00ednea] ERROR: KASAN: uso despu\u00e9s de liberaci\u00f3n en __refcount_sub_and_test include/linux/refcount.h:272 [en l\u00ednea] ERROR: KASAN: uso despu\u00e9s de liberaci\u00f3n en __refcount_dec_and_test include/linux/refcount.h :315 [en l\u00ednea] ERROR: KASAN: uso despu\u00e9s de liberaci\u00f3n en refcount_dec_and_test include/linux/refcount.h:333 [en l\u00ednea] ERROR: KASAN: uso despu\u00e9s de liberaci\u00f3n en put_dev drivers/usb/gadget/legacy/inode.c :159 [en l\u00ednea] ERROR: KASAN: use-after-free en gadgetfs_kill_sb+0x33/0x100 drivers/usb/gadget/legacy/inode.c:2086 Escritura de tama\u00f1o 4 en la direcci\u00f3n ffff8880276d7840 mediante la tarea syz-executor126/18689 CPU: 0 PID: 18689 Comunicaci\u00f3n: syz-executor126 No contaminado 6.1.0-syzkaller #0 Nombre del hardware: Google Google Compute Engine/Google Compute Engine, BIOS Google 26/10/2022 Seguimiento de llamadas:  ... atomic_fetch_sub_release include/linux/ atomic/atomic-instrumented.h:176 [en l\u00ednea] __refcount_sub_and_test include/linux/refcount.h:272 [en l\u00ednea] __refcount_dec_and_test include/linux/refcount.h:315 [en l\u00ednea] refcount_dec_and_test include/linux/refcount.h:333 [en l\u00ednea ] put_dev drivers/usb/gadget/legacy/inode.c:159 [en l\u00ednea] gadgetfs_kill_sb+0x33/0x100 drivers/usb/gadget/legacy/inode.c:2086 deactivate_locked_super+0xa7/0xf0 fs/super.c:332 vfs_get_super fs /super.c:1190 [en l\u00ednea] get_tree_single+0xd0/0x160 fs/super.c:1207 vfs_get_tree+0x88/0x270 fs/super.c:1531 vfs_fsconfig_locked fs/fsopen.c:232 [en l\u00ednea] La soluci\u00f3n m\u00e1s sencilla es garantizar que gadgetfs_fill_super() y gadgetfs_kill_sb() se serializan haciendo que ambos adquieran un nuevo mutex."
    }
  ],
  "id": "CVE-2022-48869",
  "lastModified": "2024-09-06T14:19:58.030",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "HIGH",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 4.7,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.0,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2024-08-21T07:15:04.080",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
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      "url": "https://git.kernel.org/stable/c/616fd34d017000ecf9097368b13d8a266f4920b3"
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      "url": "https://git.kernel.org/stable/c/d18dcfe9860e842f394e37ba01ca9440ab2178f4"
    }
  ],
  "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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