CVE-2022-49940 (GCVE-0-2022-49940)
Vulnerability from cvelistv5
Published
2025-06-18 10:54
Modified
2025-06-18 10:54
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
Linux Linux Version: b8faa754b523a845facdc83120b2ecd290d7fa6d
Version: dfa9b6d34aac2154b5e926d7a7a061123bf137c6
Version: 5e59c010c6862da329db17acca086afd8bea1aa8
Version: 01aecd917114577c423f07cec0d186ad007d76fc
Version: 2dc1be365a70699f7dda92fd9e48b84546086070
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   Linux Linux Version: 5.15.61   ≤
Version: 5.19.2   ≤
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/tty/n_gsm.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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              "versionType": "git"
            }
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        },
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/tty/n_gsm.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "lessThan": "5.15.66",
              "status": "affected",
              "version": "5.15.61",
              "versionType": "semver"
            },
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              "status": "affected",
              "version": "5.19.2",
              "versionType": "semver"
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      "cpeApplicability": [
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              "cpeMatch": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "versionStartIncluding": "5.15.61",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                },
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              ],
              "negate": false,
              "operator": "OR"
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          ]
        }
      ],
      "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"
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-06-18T10:54:40.745Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/5a82cf64f8ad63caf6bf115642ce44ddbc64311e"
        },
        {
          "url": "https://git.kernel.org/stable/c/309aea4b6b813f6678c3a547cfd7fe3a76ffa976"
        },
        {
          "url": "https://git.kernel.org/stable/c/5aa37f9510345a812c0998bcbbc4d88d1dcc4d8b"
        },
        {
          "url": "https://git.kernel.org/stable/c/f16c6d2e58a4c2b972efcf9eb12390ee0ba3befb"
        }
      ],
      "title": "tty: n_gsm: add sanity check for gsm-\u003ereceive in gsm_receive_buf()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2022-49940",
    "datePublished": "2025-06-18T10:54:40.745Z",
    "dateReserved": "2025-05-01T14:05:17.255Z",
    "dateUpdated": "2025-06-18T10:54:40.745Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2022-49940\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-06-18T11:15:20.917\",\"lastModified\":\"2025-06-18T13:46:52.973\",\"vulnStatus\":\"Awaiting Analysis\",\"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\"}],\"metrics\":{},\"references\":[{\"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\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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