CVE-2024-43900 (GCVE-0-2024-43900)

Vulnerability from cvelistv5 – Published: 2024-08-26 10:10 – Updated: 2026-01-05 10:52
VLAI?
Title
media: xc2028: avoid use-after-free in load_firmware_cb()
Summary
In the Linux kernel, the following vulnerability has been resolved: media: xc2028: avoid use-after-free in load_firmware_cb() syzkaller reported use-after-free in load_firmware_cb() [1]. The reason is because the module allocated a struct tuner in tuner_probe(), and then the module initialization failed, the struct tuner was released. A worker which created during module initialization accesses this struct tuner later, it caused use-after-free. The process is as follows: task-6504 worker_thread tuner_probe <= alloc dvb_frontend [2] ... request_firmware_nowait <= create a worker ... tuner_remove <= free dvb_frontend ... request_firmware_work_func <= the firmware is ready load_firmware_cb <= but now the dvb_frontend has been freed To fix the issue, check the dvd_frontend in load_firmware_cb(), if it is null, report a warning and just return. [1]: ================================================================== BUG: KASAN: use-after-free in load_firmware_cb+0x1310/0x17a0 Read of size 8 at addr ffff8000d7ca2308 by task kworker/2:3/6504 Call trace: load_firmware_cb+0x1310/0x17a0 request_firmware_work_func+0x128/0x220 process_one_work+0x770/0x1824 worker_thread+0x488/0xea0 kthread+0x300/0x430 ret_from_fork+0x10/0x20 Allocated by task 6504: kzalloc tuner_probe+0xb0/0x1430 i2c_device_probe+0x92c/0xaf0 really_probe+0x678/0xcd0 driver_probe_device+0x280/0x370 __device_attach_driver+0x220/0x330 bus_for_each_drv+0x134/0x1c0 __device_attach+0x1f4/0x410 device_initial_probe+0x20/0x30 bus_probe_device+0x184/0x200 device_add+0x924/0x12c0 device_register+0x24/0x30 i2c_new_device+0x4e0/0xc44 v4l2_i2c_new_subdev_board+0xbc/0x290 v4l2_i2c_new_subdev+0xc8/0x104 em28xx_v4l2_init+0x1dd0/0x3770 Freed by task 6504: kfree+0x238/0x4e4 tuner_remove+0x144/0x1c0 i2c_device_remove+0xc8/0x290 __device_release_driver+0x314/0x5fc device_release_driver+0x30/0x44 bus_remove_device+0x244/0x490 device_del+0x350/0x900 device_unregister+0x28/0xd0 i2c_unregister_device+0x174/0x1d0 v4l2_device_unregister+0x224/0x380 em28xx_v4l2_init+0x1d90/0x3770 The buggy address belongs to the object at ffff8000d7ca2000 which belongs to the cache kmalloc-2k of size 2048 The buggy address is located 776 bytes inside of 2048-byte region [ffff8000d7ca2000, ffff8000d7ca2800) The buggy address belongs to the page: page:ffff7fe00035f280 count:1 mapcount:0 mapping:ffff8000c001f000 index:0x0 flags: 0x7ff800000000100(slab) raw: 07ff800000000100 ffff7fe00049d880 0000000300000003 ffff8000c001f000 raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000 page dumped because: kasan: bad access detected Memory state around the buggy address: ffff8000d7ca2200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8000d7ca2280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb >ffff8000d7ca2300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ^ ffff8000d7ca2380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ffff8000d7ca2400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb ================================================================== [2] Actually, it is allocated for struct tuner, and dvb_frontend is inside.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 61a96113de51e1f8f43ac98cbeadb54e60045905 , < ef517bdfc01818419f7bd426969a0c86b14f3e0e (git)
Affected: 61a96113de51e1f8f43ac98cbeadb54e60045905 , < 850304152d367f104d21c77cfbcc05806504218b (git)
Affected: 61a96113de51e1f8f43ac98cbeadb54e60045905 , < 208deb6d8c3cb8c3acb1f41eb31cf68ea08726d5 (git)
Affected: 61a96113de51e1f8f43ac98cbeadb54e60045905 , < 68594cec291ff9523b9feb3f43fd853dcddd1f60 (git)
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    Linux Linux Affected: 3.6
Unaffected: 0 , < 3.6 (semver)
Unaffected: 6.1.105 , ≤ 6.1.* (semver)
Unaffected: 6.6.46 , ≤ 6.6.* (semver)
Unaffected: 6.10.5 , ≤ 6.10.* (semver)
Unaffected: 6.11 , ≤ * (original_commit_for_fix)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmedia: xc2028: avoid use-after-free in load_firmware_cb()\n\nsyzkaller reported use-after-free in load_firmware_cb() [1].\nThe reason is because the module allocated a struct tuner in tuner_probe(),\nand then the module initialization failed, the struct tuner was released.\nA worker which created during module initialization accesses this struct\ntuner later, it caused use-after-free.\n\nThe process is as follows:\n\ntask-6504           worker_thread\ntuner_probe                             \u003c= alloc dvb_frontend [2]\n...\nrequest_firmware_nowait                 \u003c= create a worker\n...\ntuner_remove                            \u003c= free dvb_frontend\n...\n                    request_firmware_work_func  \u003c= the firmware is ready\n                    load_firmware_cb    \u003c= but now the dvb_frontend has been freed\n\nTo fix the issue, check the dvd_frontend in load_firmware_cb(), if it is\nnull, report a warning and just return.\n\n[1]:\n    ==================================================================\n     BUG: KASAN: use-after-free in load_firmware_cb+0x1310/0x17a0\n     Read of size 8 at addr ffff8000d7ca2308 by task kworker/2:3/6504\n\n     Call trace:\n      load_firmware_cb+0x1310/0x17a0\n      request_firmware_work_func+0x128/0x220\n      process_one_work+0x770/0x1824\n      worker_thread+0x488/0xea0\n      kthread+0x300/0x430\n      ret_from_fork+0x10/0x20\n\n     Allocated by task 6504:\n      kzalloc\n      tuner_probe+0xb0/0x1430\n      i2c_device_probe+0x92c/0xaf0\n      really_probe+0x678/0xcd0\n      driver_probe_device+0x280/0x370\n      __device_attach_driver+0x220/0x330\n      bus_for_each_drv+0x134/0x1c0\n      __device_attach+0x1f4/0x410\n      device_initial_probe+0x20/0x30\n      bus_probe_device+0x184/0x200\n      device_add+0x924/0x12c0\n      device_register+0x24/0x30\n      i2c_new_device+0x4e0/0xc44\n      v4l2_i2c_new_subdev_board+0xbc/0x290\n      v4l2_i2c_new_subdev+0xc8/0x104\n      em28xx_v4l2_init+0x1dd0/0x3770\n\n     Freed by task 6504:\n      kfree+0x238/0x4e4\n      tuner_remove+0x144/0x1c0\n      i2c_device_remove+0xc8/0x290\n      __device_release_driver+0x314/0x5fc\n      device_release_driver+0x30/0x44\n      bus_remove_device+0x244/0x490\n      device_del+0x350/0x900\n      device_unregister+0x28/0xd0\n      i2c_unregister_device+0x174/0x1d0\n      v4l2_device_unregister+0x224/0x380\n      em28xx_v4l2_init+0x1d90/0x3770\n\n     The buggy address belongs to the object at ffff8000d7ca2000\n      which belongs to the cache kmalloc-2k of size 2048\n     The buggy address is located 776 bytes inside of\n      2048-byte region [ffff8000d7ca2000, ffff8000d7ca2800)\n     The buggy address belongs to the page:\n     page:ffff7fe00035f280 count:1 mapcount:0 mapping:ffff8000c001f000 index:0x0\n     flags: 0x7ff800000000100(slab)\n     raw: 07ff800000000100 ffff7fe00049d880 0000000300000003 ffff8000c001f000\n     raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000\n     page dumped because: kasan: bad access detected\n\n     Memory state around the buggy address:\n      ffff8000d7ca2200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb\n      ffff8000d7ca2280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb\n     \u003effff8000d7ca2300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb\n                           ^\n      ffff8000d7ca2380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb\n      ffff8000d7ca2400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb\n     ==================================================================\n\n[2]\n    Actually, it is allocated for struct tuner, and dvb_frontend is inside."
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    "dateUpdated": "2026-01-05T10:52:27.228Z",
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\"https://git.kernel.org/stable/c/208deb6d8c3cb8c3acb1f41eb31cf68ea08726d5\"}, {\"url\": \"https://git.kernel.org/stable/c/68594cec291ff9523b9feb3f43fd853dcddd1f60\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nmedia: xc2028: avoid use-after-free in load_firmware_cb()\\n\\nsyzkaller reported use-after-free in load_firmware_cb() [1].\\nThe reason is because the module allocated a struct tuner in tuner_probe(),\\nand then the module initialization failed, the struct tuner was released.\\nA worker which created during module initialization accesses this struct\\ntuner later, it caused use-after-free.\\n\\nThe process is as follows:\\n\\ntask-6504           worker_thread\\ntuner_probe                             \u003c= alloc dvb_frontend [2]\\n...\\nrequest_firmware_nowait                 \u003c= create a worker\\n...\\ntuner_remove                            \u003c= free dvb_frontend\\n...\\n                    request_firmware_work_func  \u003c= the firmware is ready\\n                    load_firmware_cb    \u003c= but now the dvb_frontend has been freed\\n\\nTo fix the issue, check the dvd_frontend in load_firmware_cb(), if it is\\nnull, report a warning and just return.\\n\\n[1]:\\n    ==================================================================\\n     BUG: KASAN: use-after-free in load_firmware_cb+0x1310/0x17a0\\n     Read of size 8 at addr ffff8000d7ca2308 by task kworker/2:3/6504\\n\\n     Call trace:\\n      load_firmware_cb+0x1310/0x17a0\\n      request_firmware_work_func+0x128/0x220\\n      process_one_work+0x770/0x1824\\n      worker_thread+0x488/0xea0\\n      kthread+0x300/0x430\\n      ret_from_fork+0x10/0x20\\n\\n     Allocated by task 6504:\\n      kzalloc\\n      tuner_probe+0xb0/0x1430\\n      i2c_device_probe+0x92c/0xaf0\\n      really_probe+0x678/0xcd0\\n      driver_probe_device+0x280/0x370\\n      __device_attach_driver+0x220/0x330\\n      bus_for_each_drv+0x134/0x1c0\\n      __device_attach+0x1f4/0x410\\n      device_initial_probe+0x20/0x30\\n      bus_probe_device+0x184/0x200\\n      device_add+0x924/0x12c0\\n      device_register+0x24/0x30\\n      i2c_new_device+0x4e0/0xc44\\n      v4l2_i2c_new_subdev_board+0xbc/0x290\\n      v4l2_i2c_new_subdev+0xc8/0x104\\n      em28xx_v4l2_init+0x1dd0/0x3770\\n\\n     Freed by task 6504:\\n      kfree+0x238/0x4e4\\n      tuner_remove+0x144/0x1c0\\n      i2c_device_remove+0xc8/0x290\\n      __device_release_driver+0x314/0x5fc\\n      device_release_driver+0x30/0x44\\n      bus_remove_device+0x244/0x490\\n      device_del+0x350/0x900\\n      device_unregister+0x28/0xd0\\n      i2c_unregister_device+0x174/0x1d0\\n      v4l2_device_unregister+0x224/0x380\\n      em28xx_v4l2_init+0x1d90/0x3770\\n\\n     The buggy address belongs to the object at ffff8000d7ca2000\\n      which belongs to the cache kmalloc-2k of size 2048\\n     The buggy address is located 776 bytes inside of\\n      2048-byte region [ffff8000d7ca2000, ffff8000d7ca2800)\\n     The buggy address belongs to the page:\\n     page:ffff7fe00035f280 count:1 mapcount:0 mapping:ffff8000c001f000 index:0x0\\n     flags: 0x7ff800000000100(slab)\\n     raw: 07ff800000000100 ffff7fe00049d880 0000000300000003 ffff8000c001f000\\n     raw: 0000000000000000 0000000080100010 00000001ffffffff 0000000000000000\\n     page dumped because: kasan: bad access detected\\n\\n     Memory state around the buggy address:\\n      ffff8000d7ca2200: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb\\n      ffff8000d7ca2280: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb\\n     \u003effff8000d7ca2300: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb\\n                           ^\\n      ffff8000d7ca2380: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb\\n      ffff8000d7ca2400: fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb fb\\n     ==================================================================\\n\\n[2]\\n    Actually, it is allocated for struct tuner, and dvb_frontend is inside.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.105\", \"versionStartIncluding\": \"3.6\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.46\", \"versionStartIncluding\": \"3.6\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.10.5\", \"versionStartIncluding\": \"3.6\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.11\", \"versionStartIncluding\": \"3.6\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-01-05T10:52:27.228Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2024-43900\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-01-05T10:52:27.228Z\", \"dateReserved\": \"2024-08-17T09:11:59.291Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-08-26T10:10:58.767Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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  • 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.



Detection rules are retrieved from Rulezet.