{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2022-49940",
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "state": "PUBLISHED",
        "assignerShortName": "Linux",
        "dateReserved": "2025-05-01T14:05:17.255Z",
        "datePublished": "2025-06-18T10:54:40.745Z",
        "dateUpdated": "2026-05-23T15:23:19.793Z"
    },
    "containers": {
        "cna": {
            "providerMetadata": {
                "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
                "shortName": "Linux",
                "dateUpdated": "2026-05-23T15:23:19.793Z"
            },
            "descriptions": [
                {
                    "lang": "en",
                    "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntty: n_gsm: add sanity check for gsm->receive in gsm_receive_buf()\n\nA null pointer dereference can happen when attempting to access the\n\"gsm->receive()\" function in gsmld_receive_buf(). Currently, the code\nassumes that gsm->recieve is only called after MUX activation.\nSince the gsmld_receive_buf() function can be accessed without the need to\ninitialize the MUX, the gsm->receive() function will not be set and a\nNULL pointer dereference will occur.\n\nFix this by avoiding the call to \"gsm->receive()\" in case the function is\nnot initialized by adding a sanity check.\n\nCall Trace:\n <TASK>\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"
                }
            ],
            "affected": [
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "drivers/tty/n_gsm.c"
                    ],
                    "versions": [
                        {
                            "version": "b8faa754b523a845facdc83120b2ecd290d7fa6d",
                            "lessThan": "5a82cf64f8ad63caf6bf115642ce44ddbc64311e",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "dfa9b6d34aac2154b5e926d7a7a061123bf137c6",
                            "lessThan": "309aea4b6b813f6678c3a547cfd7fe3a76ffa976",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "5e59c010c6862da329db17acca086afd8bea1aa8",
                            "lessThan": "5aa37f9510345a812c0998bcbbc4d88d1dcc4d8b",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "01aecd917114577c423f07cec0d186ad007d76fc",
                            "lessThan": "f16c6d2e58a4c2b972efcf9eb12390ee0ba3befb",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "2dc1be365a70699f7dda92fd9e48b84546086070",
                            "status": "affected",
                            "versionType": "git"
                        },
                        {
                            "version": "5.18.18",
                            "lessThan": "5.19",
                            "status": "affected",
                            "versionType": "semver"
                        }
                    ]
                },
                {
                    "product": "Linux",
                    "vendor": "Linux",
                    "defaultStatus": "unaffected",
                    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                    "programFiles": [
                        "drivers/tty/n_gsm.c"
                    ],
                    "versions": [
                        {
                            "version": "5.15.61",
                            "lessThan": "5.15.66",
                            "status": "affected",
                            "versionType": "semver"
                        },
                        {
                            "version": "5.19.2",
                            "lessThan": "5.19.8",
                            "status": "affected",
                            "versionType": "semver"
                        }
                    ]
                }
            ],
            "cpeApplicability": [
                {
                    "nodes": [
                        {
                            "operator": "OR",
                            "negate": false,
                            "cpeMatch": [
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "5.15.61",
                                    "versionEndExcluding": "5.15.66"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "5.19.2",
                                    "versionEndExcluding": "5.19.8"
                                },
                                {
                                    "vulnerable": true,
                                    "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                                    "versionStartIncluding": "5.18.18"
                                }
                            ]
                        }
                    ]
                }
            ],
            "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->receive in gsm_receive_buf()",
            "x_generator": {
                "engine": "bippy-1.2.0"
            }
        }
    }
}