CVE-2022-50773 (GCVE-0-2022-50773)
Vulnerability from cvelistv5
Published
2025-12-24 13:06
Modified
2025-12-24 13:06
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: ALSA: mts64: fix possible null-ptr-defer in snd_mts64_interrupt I got a null-ptr-defer error report when I do the following tests on the qemu platform: make defconfig and CONFIG_PARPORT=m, CONFIG_PARPORT_PC=m, CONFIG_SND_MTS64=m Then making test scripts: cat>test_mod1.sh<<EOF modprobe snd-mts64 modprobe snd-mts64 EOF Executing the script, perhaps several times, we will get a null-ptr-defer report, as follow: syzkaller:~# ./test_mod.sh snd_mts64: probe of snd_mts64.0 failed with error -5 modprobe: ERROR: could not insert 'snd_mts64': No such device BUG: kernel NULL pointer dereference, address: 0000000000000000 #PF: supervisor write access in kernel mode #PF: error_code(0x0002) - not-present page PGD 0 P4D 0 Oops: 0002 [#1] PREEMPT SMP PTI CPU: 0 PID: 205 Comm: modprobe Not tainted 6.1.0-rc8-00588-g76dcd734eca2 #6 Call Trace: <IRQ> snd_mts64_interrupt+0x24/0xa0 [snd_mts64] parport_irq_handler+0x37/0x50 [parport] __handle_irq_event_percpu+0x39/0x190 handle_irq_event_percpu+0xa/0x30 handle_irq_event+0x2f/0x50 handle_edge_irq+0x99/0x1b0 __common_interrupt+0x5d/0x100 common_interrupt+0xa0/0xc0 </IRQ> <TASK> asm_common_interrupt+0x22/0x40 RIP: 0010:_raw_write_unlock_irqrestore+0x11/0x30 parport_claim+0xbd/0x230 [parport] snd_mts64_probe+0x14a/0x465 [snd_mts64] platform_probe+0x3f/0xa0 really_probe+0x129/0x2c0 __driver_probe_device+0x6d/0xc0 driver_probe_device+0x1a/0xa0 __device_attach_driver+0x7a/0xb0 bus_for_each_drv+0x62/0xb0 __device_attach+0xe4/0x180 bus_probe_device+0x82/0xa0 device_add+0x550/0x920 platform_device_add+0x106/0x220 snd_mts64_attach+0x2e/0x80 [snd_mts64] port_check+0x14/0x20 [parport] bus_for_each_dev+0x6e/0xc0 __parport_register_driver+0x7c/0xb0 [parport] snd_mts64_module_init+0x31/0x1000 [snd_mts64] do_one_initcall+0x3c/0x1f0 do_init_module+0x46/0x1c6 load_module+0x1d8d/0x1e10 __do_sys_finit_module+0xa2/0xf0 do_syscall_64+0x37/0x90 entry_SYSCALL_64_after_hwframe+0x63/0xcd </TASK> Kernel panic - not syncing: Fatal exception in interrupt Rebooting in 1 seconds.. The mts wa not initialized during interrupt, we add check for mts to fix this bug.
References
Impacted products
Vendor Product Version
Linux Linux Version: 68ab801e32bbe2caac8b8c6e6e94f41fe7d687ad
Version: 68ab801e32bbe2caac8b8c6e6e94f41fe7d687ad
Version: 68ab801e32bbe2caac8b8c6e6e94f41fe7d687ad
Version: 68ab801e32bbe2caac8b8c6e6e94f41fe7d687ad
Version: 68ab801e32bbe2caac8b8c6e6e94f41fe7d687ad
Version: 68ab801e32bbe2caac8b8c6e6e94f41fe7d687ad
Version: 68ab801e32bbe2caac8b8c6e6e94f41fe7d687ad
Version: 68ab801e32bbe2caac8b8c6e6e94f41fe7d687ad
Version: 68ab801e32bbe2caac8b8c6e6e94f41fe7d687ad
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{
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nALSA: mts64: fix possible null-ptr-defer in snd_mts64_interrupt\n\nI got a null-ptr-defer error report when I do the following tests\non the qemu platform:\n\nmake defconfig and CONFIG_PARPORT=m, CONFIG_PARPORT_PC=m,\nCONFIG_SND_MTS64=m\n\nThen making test scripts:\ncat\u003etest_mod1.sh\u003c\u003cEOF\nmodprobe snd-mts64\nmodprobe snd-mts64\nEOF\n\nExecuting the script, perhaps several times, we will get a null-ptr-defer\nreport, as follow:\n\nsyzkaller:~# ./test_mod.sh\nsnd_mts64: probe of snd_mts64.0 failed with error -5\nmodprobe: ERROR: could not insert \u0027snd_mts64\u0027: No such device\n BUG: kernel NULL pointer dereference, address: 0000000000000000\n #PF: supervisor write access in kernel mode\n #PF: error_code(0x0002) - not-present page\n PGD 0 P4D 0\n Oops: 0002 [#1] PREEMPT SMP PTI\n CPU: 0 PID: 205 Comm: modprobe Not tainted 6.1.0-rc8-00588-g76dcd734eca2 #6\n Call Trace:\n  \u003cIRQ\u003e\n  snd_mts64_interrupt+0x24/0xa0 [snd_mts64]\n  parport_irq_handler+0x37/0x50 [parport]\n  __handle_irq_event_percpu+0x39/0x190\n  handle_irq_event_percpu+0xa/0x30\n  handle_irq_event+0x2f/0x50\n  handle_edge_irq+0x99/0x1b0\n  __common_interrupt+0x5d/0x100\n  common_interrupt+0xa0/0xc0\n  \u003c/IRQ\u003e\n  \u003cTASK\u003e\n  asm_common_interrupt+0x22/0x40\n RIP: 0010:_raw_write_unlock_irqrestore+0x11/0x30\n  parport_claim+0xbd/0x230 [parport]\n  snd_mts64_probe+0x14a/0x465 [snd_mts64]\n  platform_probe+0x3f/0xa0\n  really_probe+0x129/0x2c0\n  __driver_probe_device+0x6d/0xc0\n  driver_probe_device+0x1a/0xa0\n  __device_attach_driver+0x7a/0xb0\n  bus_for_each_drv+0x62/0xb0\n  __device_attach+0xe4/0x180\n  bus_probe_device+0x82/0xa0\n  device_add+0x550/0x920\n  platform_device_add+0x106/0x220\n  snd_mts64_attach+0x2e/0x80 [snd_mts64]\n  port_check+0x14/0x20 [parport]\n  bus_for_each_dev+0x6e/0xc0\n  __parport_register_driver+0x7c/0xb0 [parport]\n  snd_mts64_module_init+0x31/0x1000 [snd_mts64]\n  do_one_initcall+0x3c/0x1f0\n  do_init_module+0x46/0x1c6\n  load_module+0x1d8d/0x1e10\n  __do_sys_finit_module+0xa2/0xf0\n  do_syscall_64+0x37/0x90\n  entry_SYSCALL_64_after_hwframe+0x63/0xcd\n  \u003c/TASK\u003e\n Kernel panic - not syncing: Fatal exception in interrupt\n Rebooting in 1 seconds..\n\nThe mts wa not initialized during interrupt,  we add check for\nmts to fix this bug."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-12-24T13:06:03.533Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/06ec592389f2be3199779ab823c4323dcfd2121f"
        },
        {
          "url": "https://git.kernel.org/stable/c/b471fe61da523a15e4cb60fa81f5a2377e4bad98"
        },
        {
          "url": "https://git.kernel.org/stable/c/7e91667db38abb056da5a496d40fbd044c66bed2"
        },
        {
          "url": "https://git.kernel.org/stable/c/c7e9624d90bf20f1eed6b228949396d614b94020"
        },
        {
          "url": "https://git.kernel.org/stable/c/0649129359219ce6ff380ec401f87308485c6ae3"
        },
        {
          "url": "https://git.kernel.org/stable/c/cba633b24a98d957e8190ef8bc4d4cdb4f6e9313"
        },
        {
          "url": "https://git.kernel.org/stable/c/1a763c748acd5540ccc43306c57c9c6c5fb60884"
        },
        {
          "url": "https://git.kernel.org/stable/c/250eed7b9994d79f9c409f954dbd08e88f5afd83"
        },
        {
          "url": "https://git.kernel.org/stable/c/cf2ea3c86ad90d63d1c572b43e1ca9276b0357ad"
        }
      ],
      "title": "ALSA: mts64: fix possible null-ptr-defer in snd_mts64_interrupt",
      "x_generator": {
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    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2022-50773",
    "datePublished": "2025-12-24T13:06:03.533Z",
    "dateReserved": "2025-12-24T13:02:21.547Z",
    "dateUpdated": "2025-12-24T13:06:03.533Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2022-50773\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-12-24T13:16:04.120\",\"lastModified\":\"2025-12-24T13:16:04.120\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nALSA: mts64: fix possible null-ptr-defer in snd_mts64_interrupt\\n\\nI got a null-ptr-defer error report when I do the following tests\\non the qemu platform:\\n\\nmake defconfig and CONFIG_PARPORT=m, CONFIG_PARPORT_PC=m,\\nCONFIG_SND_MTS64=m\\n\\nThen making test scripts:\\ncat\u003etest_mod1.sh\u003c\u003cEOF\\nmodprobe snd-mts64\\nmodprobe snd-mts64\\nEOF\\n\\nExecuting the script, perhaps several times, we will get a null-ptr-defer\\nreport, as follow:\\n\\nsyzkaller:~# ./test_mod.sh\\nsnd_mts64: probe of snd_mts64.0 failed with error -5\\nmodprobe: ERROR: could not insert \u0027snd_mts64\u0027: No such device\\n BUG: kernel NULL pointer dereference, address: 0000000000000000\\n #PF: supervisor write access in kernel mode\\n #PF: error_code(0x0002) - not-present page\\n PGD 0 P4D 0\\n Oops: 0002 [#1] PREEMPT SMP PTI\\n CPU: 0 PID: 205 Comm: modprobe Not tainted 6.1.0-rc8-00588-g76dcd734eca2 #6\\n Call Trace:\\n  \u003cIRQ\u003e\\n  snd_mts64_interrupt+0x24/0xa0 [snd_mts64]\\n  parport_irq_handler+0x37/0x50 [parport]\\n  __handle_irq_event_percpu+0x39/0x190\\n  handle_irq_event_percpu+0xa/0x30\\n  handle_irq_event+0x2f/0x50\\n  handle_edge_irq+0x99/0x1b0\\n  __common_interrupt+0x5d/0x100\\n  common_interrupt+0xa0/0xc0\\n  \u003c/IRQ\u003e\\n  \u003cTASK\u003e\\n  asm_common_interrupt+0x22/0x40\\n RIP: 0010:_raw_write_unlock_irqrestore+0x11/0x30\\n  parport_claim+0xbd/0x230 [parport]\\n  snd_mts64_probe+0x14a/0x465 [snd_mts64]\\n  platform_probe+0x3f/0xa0\\n  really_probe+0x129/0x2c0\\n  __driver_probe_device+0x6d/0xc0\\n  driver_probe_device+0x1a/0xa0\\n  __device_attach_driver+0x7a/0xb0\\n  bus_for_each_drv+0x62/0xb0\\n  __device_attach+0xe4/0x180\\n  bus_probe_device+0x82/0xa0\\n  device_add+0x550/0x920\\n  platform_device_add+0x106/0x220\\n  snd_mts64_attach+0x2e/0x80 [snd_mts64]\\n  port_check+0x14/0x20 [parport]\\n  bus_for_each_dev+0x6e/0xc0\\n  __parport_register_driver+0x7c/0xb0 [parport]\\n  snd_mts64_module_init+0x31/0x1000 [snd_mts64]\\n  do_one_initcall+0x3c/0x1f0\\n  do_init_module+0x46/0x1c6\\n  load_module+0x1d8d/0x1e10\\n  __do_sys_finit_module+0xa2/0xf0\\n  do_syscall_64+0x37/0x90\\n  entry_SYSCALL_64_after_hwframe+0x63/0xcd\\n  \u003c/TASK\u003e\\n Kernel panic - not syncing: Fatal exception in interrupt\\n Rebooting in 1 seconds..\\n\\nThe mts wa not initialized during interrupt,  we add check for\\nmts to fix this bug.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/0649129359219ce6ff380ec401f87308485c6ae3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/06ec592389f2be3199779ab823c4323dcfd2121f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/1a763c748acd5540ccc43306c57c9c6c5fb60884\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/250eed7b9994d79f9c409f954dbd08e88f5afd83\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/7e91667db38abb056da5a496d40fbd044c66bed2\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b471fe61da523a15e4cb60fa81f5a2377e4bad98\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c7e9624d90bf20f1eed6b228949396d614b94020\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/cba633b24a98d957e8190ef8bc4d4cdb4f6e9313\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/cf2ea3c86ad90d63d1c572b43e1ca9276b0357ad\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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