github - ghsa-52j6-g7fj-mfjm

GHSA-52J6-G7FJ-MFJM

Vulnerability from github – Published: 2025-06-18 12:30 – Updated: 2025-11-14 21:30

Details

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: 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

Severity ?

5.5 (Medium)


                  
                    CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

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{
  "affected": [],
  "aliases": [
    "CVE-2022-49940"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-476"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2025-06-18T11:15:20Z",
    "severity": "MODERATE"
  },
  "details": "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",
  "id": "GHSA-52j6-g7fj-mfjm",
  "modified": "2025-11-14T21:30:27Z",
  "published": "2025-06-18T12:30:35Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2022-49940"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/309aea4b6b813f6678c3a547cfd7fe3a76ffa976"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5a82cf64f8ad63caf6bf115642ce44ddbc64311e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5aa37f9510345a812c0998bcbbc4d88d1dcc4d8b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f16c6d2e58a4c2b972efcf9eb12390ee0ba3befb"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2022-49940 (GCVE-0-2022-49940)

Vulnerability from cvelistv5 – Published: 2025-06-18 10:54 – Updated: 2025-06-18 10:54

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

Severity ?

No CVSS data available.

Assigner

Linux

References

URL

Tags

	https://git.kernel.org/stable/c/5a82cf64f8ad63caf…
	https://git.kernel.org/stable/c/309aea4b6b813f667…
	https://git.kernel.org/stable/c/5aa37f9510345a812…
	https://git.kernel.org/stable/c/f16c6d2e58a4c2b97…

Impacted products

Vendor

Product

Version

Linux

Affected: b8faa754b523a845facdc83120b2ecd290d7fa6d , < 5a82cf64f8ad63caf6bf115642ce44ddbc64311e (git)
Affected: dfa9b6d34aac2154b5e926d7a7a061123bf137c6 , < 309aea4b6b813f6678c3a547cfd7fe3a76ffa976 (git)
Affected: 5e59c010c6862da329db17acca086afd8bea1aa8 , < 5aa37f9510345a812c0998bcbbc4d88d1dcc4d8b (git)
Affected: 01aecd917114577c423f07cec0d186ad007d76fc , < f16c6d2e58a4c2b972efcf9eb12390ee0ba3befb (git)
Affected: 2dc1be365a70699f7dda92fd9e48b84546086070 (git)

Linux

Affected: 5.15.61 , < 5.15.66 (semver)
Affected: 5.19.2 , < 5.19.8 (semver)

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JSON

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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",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "5a82cf64f8ad63caf6bf115642ce44ddbc64311e",
              "status": "affected",
              "version": "b8faa754b523a845facdc83120b2ecd290d7fa6d",
              "versionType": "git"
            },
            {
              "lessThan": "309aea4b6b813f6678c3a547cfd7fe3a76ffa976",
              "status": "affected",
              "version": "dfa9b6d34aac2154b5e926d7a7a061123bf137c6",
              "versionType": "git"
            },
            {
              "lessThan": "5aa37f9510345a812c0998bcbbc4d88d1dcc4d8b",
              "status": "affected",
              "version": "5e59c010c6862da329db17acca086afd8bea1aa8",
              "versionType": "git"
            },
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              "versionType": "git"
            },
            {
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              "version": "2dc1be365a70699f7dda92fd9e48b84546086070",
              "versionType": "git"
            }
          ]
        },
        {
          "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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              "status": "affected",
              "version": "5.15.61",
              "versionType": "semver"
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              "status": "affected",
              "version": "5.19.2",
              "versionType": "semver"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.15.66",
                  "versionStartIncluding": "5.15.61",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "5.19.8",
                  "versionStartIncluding": "5.19.2",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionStartIncluding": "5.18.18",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "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"
        },
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          "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"
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    "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"
}

Sightings

Author	Source	Type	Date

Nomenclature

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.

Action not permitted

GHSA-52J6-G7FJ-MFJM

CVE-2022-49940 (GCVE-0-2022-49940)

Tags

Sightings

Nomenclature