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And the caller of smc_switch_to_fallback() will identify\nwhether fallback succeeds according to the return value."}, {"lang": "es", "value": "En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: net/smc: soluci\u00f3n transitoria para el problema de ejecuci\u00f3n de clcsock Encontramos un bloqueo en smc_setsockopt() y se debe al acceso a smc-&gt;clcsock despu\u00e9s de que se lanz\u00f3 clcsock. ERROR: desreferencia del puntero NULL del kernel, direcci\u00f3n: 0000000000000020 #PF: acceso de lectura del supervisor en modo kernel #PF: c\u00f3digo_error(0x0000) - p\u00e1gina no presente PGD 0 P4D 0 Ups: 0000 [#1] PREEMPT SMP PTI CPU: 1 PID: 50309 Comm: nginx Kdump: cargado Contaminado: GE 5.16.0-rc4+ #53 RIP: 0010:smc_setsockopt+0x59/0x280 [smc] Seguimiento de llamadas: __sys_setsockopt+0xfc/0x190 __x64_sys_setsockopt+0x20/0x30 do_syscall_64+0x34/0x90 Entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f16ba83918e Este parche intenta solucionarlo manteniendo presionado clcsock_release_lock y verificando si clcsock ya se ha liberado antes del acceso. En caso de que ocurra una falla por el mismo motivo en smc_getsockopt() o smc_switch_to_fallback(), este parche tambi\u00e9n verifica smc-&gt;clcsock en ellos. Y la persona que llama a smc_switch_to_fallback() identificar\u00e1 si el respaldo tiene \u00e9xito de acuerdo con el valor de retorno."}], "id": "CVE-2022-48751", "lastModified": "2026-06-17T05:16:05.923", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 4.7, "baseSeverity": "MEDIUM", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 1.0, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2022-48751", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-09-10T17:10:28.867754Z", "version": "2.0.3"}}]}, "published": "2024-06-20T12:15:13.310", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/38f0bdd548fd2ef5d481b88d8a2bfef968452e34"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/4284225cd8001e134f5cf533a7cd244bbb654d0f"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c0bf3d8a943b6f2e912b7c1de03e2ef28e76f760"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/38f0bdd548fd2ef5d481b88d8a2bfef968452e34"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/4284225cd8001e134f5cf533a7cd244bbb654d0f"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c0bf3d8a943b6f2e912b7c1de03e2ef28e76f760"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-476"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: net/smc: Transitional solution for clcsock race issue", "id": "2293308", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2293308"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "details": ["In the Linux kernel, the following vulnerability has been resolved:\nnet/smc: Transitional solution for clcsock race issue\nWe encountered a crash in smc_setsockopt() and it is caused by\naccessing smc->clcsock after clcsock was released.\nBUG: kernel NULL pointer dereference, address: 0000000000000020\n#PF: supervisor read access in kernel mode\n#PF: error_code(0x0000) - not-present page\nPGD 0 P4D 0\nOops: 0000 [#1] PREEMPT SMP PTI\nCPU: 1 PID: 50309 Comm: nginx Kdump: loaded Tainted: G E 5.16.0-rc4+ #53\nRIP: 0010:smc_setsockopt+0x59/0x280 [smc]\nCall Trace:\n<TASK>\n__sys_setsockopt+0xfc/0x190\n__x64_sys_setsockopt+0x20/0x30\ndo_syscall_64+0x34/0x90\nentry_SYSCALL_64_after_hwframe+0x44/0xae\nRIP: 0033:0x7f16ba83918e\n</TASK>\nThis patch tries to fix it by holding clcsock_release_lock and\nchecking whether clcsock has already been released before access.\nIn case that a crash of the same reason happens in smc_getsockopt()\nor smc_switch_to_fallback(), this patch also checkes smc->clcsock\nin them too. And the caller of smc_switch_to_fallback() will identify\nwhether fallback succeeds according to the return value.", "A flaw was found in the Linux kernel. A potential crash was observed in smc_setsockopt()."], "name": "CVE-2022-48751", "package_state": [{"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": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Will not fix", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-06-20T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2022-48751\nhttps://nvd.nist.gov/vuln/detail/CVE-2022-48751\nhttps://lore.kernel.org/linux-cve-announce/2024062005-CVE-2022-48751-10d0@gregkh/T"], "threat_severity": "Moderate"}

{}