CVE-2022-49940

{"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"}}}}

{}

{"affected": [{"affectedData": [{"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"}, {"lessThan": "f16c6d2e58a4c2b972efcf9eb12390ee0ba3befb", "status": "affected", "version": "01aecd917114577c423f07cec0d186ad007d76fc", "versionType": "git"}, {"status": "affected", "version": "2dc1be365a70699f7dda92fd9e48b84546086070", "versionType": "git"}, {"lessThan": "5.19", "status": "affected", "version": "5.18.18", "versionType": "semver"}]}, {"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": "5.15.66", "status": "affected", "version": "5.15.61", "versionType": "semver"}, {"lessThan": "5.19.8", "status": "affected", "version": "5.19.2", "versionType": "semver"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "7A949C3C-CF0E-4534-AACE-D99FED95FCAE", "versionEndExcluding": "5.15.66", "versionStartIncluding": "5.15.61", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "B60CAFE2-08C3-461B-B5F8-25BEB0C9853E", "versionEndExcluding": "5.19", "versionStartIncluding": "5.18.18", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "matchCriteriaId": "00F39B21-9F82-4FE5-A788-FD1349833FBC", "versionEndExcluding": "5.19.8", "versionStartIncluding": "5.19.2", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.0:rc1:*:*:*:*:*:*", "matchCriteriaId": "E8BD11A3-8643-49B6-BADE-5029A0117325", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.0:rc2:*:*:*:*:*:*", "matchCriteriaId": "5F0AD220-F6A9-4012-8636-155F1B841FAD", "vulnerable": true}, {"criteria": "cpe:2.3:o:linux:linux_kernel:6.0:rc3:*:*:*:*:*:*", "matchCriteriaId": "A46498B3-78E1-4623-AAE1-94D29A42BE4E", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "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"}, {"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-&gt;receive en gsm_receive_buf(). Se puede producir una desreferencia de puntero nulo al intentar acceder a la funci\u00f3n \"gsm-&gt;receive()\" en gsmld_receive_buf(). Actualmente, el c\u00f3digo asume que gsm-&gt;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-&gt;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": "2026-06-17T05:19:34.990", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 5.5, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2025-06-18T11:15:20.917", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/309aea4b6b813f6678c3a547cfd7fe3a76ffa976"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/5a82cf64f8ad63caf6bf115642ce44ddbc64311e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/5aa37f9510345a812c0998bcbbc4d88d1dcc4d8b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f16c6d2e58a4c2b972efcf9eb12390ee0ba3befb"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-476"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"affected_release": [{"advisory": "RHSA-2024:3138", "cpe": "cpe:/o:redhat:enterprise_linux:8", "package": "kernel-0:4.18.0-553.el8_10", "product_name": "Red Hat Enterprise Linux 8", "release_date": "2024-05-22T00:00:00Z"}, {"advisory": "RHSA-2024:2621", "cpe": "cpe:/o:redhat:rhel_eus:8.8", "package": "kernel-0:4.18.0-477.55.1.el8_8", "product_name": "Red Hat Enterprise Linux 8.8 Extended Update Support", "release_date": "2024-04-30T00:00:00Z"}, {"advisory": "RHSA-2024:2394", "cpe": "cpe:/a:redhat:enterprise_linux:9", "package": "kernel-0:5.14.0-427.13.1.el9_4", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2024-04-30T00:00:00Z"}, {"advisory": "RHSA-2024:2394", "cpe": "cpe:/o:redhat:enterprise_linux:9", "package": "kernel-0:5.14.0-427.13.1.el9_4", "product_name": "Red Hat Enterprise Linux 9", "release_date": "2024-04-30T00:00:00Z"}], "bugzilla": {"description": "kernel: tty: n_gsm: add sanity check for gsm->receive in gsm_receive_buf()", "id": "2373397", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2373397"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "verified"}, "details": ["In the Linux kernel, the following vulnerability has been resolved:\ntty: n_gsm: add sanity check for gsm->receive in gsm_receive_buf()\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.\nFix this by avoiding the call to \"gsm->receive()\" in case the function is\nnot initialized by adding a sanity check.\nCall Trace:\n<TASK>\ngsmld_receive_buf+0x1c2/0x2f0 drivers/tty/n_gsm.c:2861\ntiocsti drivers/tty/tty_io.c:2293 [inline]\ntty_ioctl+0xa75/0x15d0 drivers/tty/tty_io.c:2692\nvfs_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\ndo_syscall_x64 arch/x86/entry/common.c:50 [inline]\ndo_syscall_64+0x35/0xb0 arch/x86/entry/common.c:80\nentry_SYSCALL_64_after_hwframe+0x63/0xcd"], "name": "CVE-2022-49940", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2025-06-18T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2022-49940\nhttps://nvd.nist.gov/vuln/detail/CVE-2022-49940\nhttps://lore.kernel.org/linux-cve-announce/2025061848-CVE-2022-49940-181b@gregkh/T"], "threat_severity": "Moderate"}

{"created": "2025-06-23T08:53:46.956544+00:00", "updated": "2025-06-23T08:53:46.956597+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}