fkie_cve-2022-49940
Vulnerability from fkie_nvd
Published
2025-06-18 11:15
Modified
2025-06-18 13:46
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: tty: n_gsm: add sanity check for gsm->receive in gsm_receive_buf() A null pointer dereference can happen when attempting to access the "gsm->receive()" function in gsmld_receive_buf(). Currently, the code assumes that gsm->recieve is only called after MUX activation. Since the gsmld_receive_buf() function can be accessed without the need to initialize the MUX, the gsm->receive() function will not be set and a NULL pointer dereference will occur. Fix this by avoiding the call to "gsm->receive()" in case the function is not initialized by adding a sanity check. Call Trace: <TASK> gsmld_receive_buf+0x1c2/0x2f0 drivers/tty/n_gsm.c:2861 tiocsti drivers/tty/tty_io.c:2293 [inline] tty_ioctl+0xa75/0x15d0 drivers/tty/tty_io.c:2692 vfs_ioctl fs/ioctl.c:51 [inline] __do_sys_ioctl fs/ioctl.c:870 [inline] __se_sys_ioctl fs/ioctl.c:856 [inline] __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:50 [inline] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/309aea4b6b813f6678c3a547cfd7fe3a76ffa976
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5a82cf64f8ad63caf6bf115642ce44ddbc64311e
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/5aa37f9510345a812c0998bcbbc4d88d1dcc4d8b
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f16c6d2e58a4c2b972efcf9eb12390ee0ba3befb
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\ntty: n_gsm: add sanity check for gsm-\u003ereceive in gsm_receive_buf()\n\nA null pointer dereference can happen when attempting to access the\n\"gsm-\u003ereceive()\" function in gsmld_receive_buf(). Currently, the code\nassumes that gsm-\u003erecieve is only called after MUX activation.\nSince the gsmld_receive_buf() function can be accessed without the need to\ninitialize the MUX, the gsm-\u003ereceive() function will not be set and a\nNULL pointer dereference will occur.\n\nFix this by avoiding the call to \"gsm-\u003ereceive()\" in case the function is\nnot initialized by adding a sanity check.\n\nCall Trace:\n \u003cTASK\u003e\n gsmld_receive_buf+0x1c2/0x2f0 drivers/tty/n_gsm.c:2861\n tiocsti drivers/tty/tty_io.c:2293 [inline]\n tty_ioctl+0xa75/0x15d0 drivers/tty/tty_io.c:2692\n vfs_ioctl fs/ioctl.c:51 [inline]\n __do_sys_ioctl fs/ioctl.c:870 [inline]\n __se_sys_ioctl fs/ioctl.c:856 [inline]\n __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:856\n do_syscall_x64 arch/x86/entry/common.c:50 [inline]\n do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80\n entry_SYSCALL_64_after_hwframe+0x63/0xcd"
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: tty: n_gsm: a\u00f1adir comprobaci\u00f3n de validez para gsm-\u0026gt;receive en gsm_receive_buf(). Se puede producir una desreferencia de puntero nulo al intentar acceder a la funci\u00f3n \"gsm-\u0026gt;receive()\" en gsmld_receive_buf(). Actualmente, el c\u00f3digo asume que gsm-\u0026gt;recieve solo se llama despu\u00e9s de la activaci\u00f3n del MUX. Dado que se puede acceder a la funci\u00f3n gsmld_receive_buf() sin necesidad de inicializar el MUX, esta funci\u00f3n no se activar\u00e1 y se producir\u00e1 una desreferencia de puntero nulo. Para solucionar esto, se debe evitar la llamada a \"gsm-\u0026gt;receive()\" si la funci\u00f3n no se inicializa mediante una comprobaci\u00f3n de validez. Rastreo de llamadas:  gsmld_receive_buf+0x1c2/0x2f0 drivers/tty/n_gsm.c:2861 tiocsti drivers/tty/tty_io.c:2293 [en l\u00ednea] tty_ioctl+0xa75/0x15d0 drivers/tty/tty_io.c:2692 vfs_ioctl fs/ioctl.c:51 [en l\u00ednea] __do_sys_ioctl fs/ioctl.c:870 [en l\u00ednea] __se_sys_ioctl fs/ioctl.c:856 [en l\u00ednea] __x64_sys_ioctl+0x193/0x200 fs/ioctl.c:856 do_syscall_x64 arch/x86/entry/common.c:50 [en l\u00ednea] do_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80 entry_SYSCALL_64_after_hwframe+0x63/0xcd"
    }
  ],
  "id": "CVE-2022-49940",
  "lastModified": "2025-06-18T13:46:52.973",
  "metrics": {},
  "published": "2025-06-18T11:15:20.917",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/309aea4b6b813f6678c3a547cfd7fe3a76ffa976"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/5a82cf64f8ad63caf6bf115642ce44ddbc64311e"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/5aa37f9510345a812c0998bcbbc4d88d1dcc4d8b"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/f16c6d2e58a4c2b972efcf9eb12390ee0ba3befb"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Awaiting Analysis"
}


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