{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2022-48751", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-06-20T11:09:39.057Z", "datePublished": "2024-06-20T11:13:32.575Z", "dateUpdated": "2026-08-05T08:52:07.796Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T08:52:07.796Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/smc: Transitional solution for clcsock race issue\n\nWe encountered a crash in smc_setsockopt() and it is caused by\naccessing smc->clcsock after clcsock was released.\n\n BUG: kernel NULL pointer dereference, address: 0000000000000020\n #PF: supervisor read access in kernel mode\n #PF: error_code(0x0000) - not-present page\n PGD 0 P4D 0\n Oops: 0000 [#1] PREEMPT SMP PTI\n CPU: 1 PID: 50309 Comm: nginx Kdump: loaded Tainted: G E 5.16.0-rc4+ #53\n RIP: 0010:smc_setsockopt+0x59/0x280 [smc]\n Call Trace:\n \n __sys_setsockopt+0xfc/0x190\n __x64_sys_setsockopt+0x20/0x30\n do_syscall_64+0x34/0x90\n entry_SYSCALL_64_after_hwframe+0x44/0xae\n RIP: 0033:0x7f16ba83918e\n \n\nThis patch tries to fix it by holding clcsock_release_lock and\nchecking whether clcsock has already been released before access.\n\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." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.8, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - The bug is reached via local socket syscalls (setsockopt/getsockopt/fallback) on an AF_SMC socket; a remote peer alone cannot invoke the vulnerable paths without local process participation.\nAC:L - The attacker controls both sides of the race by concurrently calling setsockopt/getsockopt and close (or otherwise triggering smc_clcsock_release) on a shared AF_SMC fd, so success does not depend on conditions outside attacker influence.\nPR:L - Creating and operating AF_SMC sockets requires only an unprivileged local account; smc_create has no capability check, and user namespaces are not required.\nUI:N - Exploitation uses only the attacker's own syscalls on sockets they create; no separate victim action is required.\nS:U - Impact is confined to the local kernel's SMC/socket authority; this is standard kernel memory-safety damage, not a cross-boundary escape.\nC:H - The unlocked clcsock access races with smc_clcsock_release()'s sock_release, yielding a use-after-free on the TCP CLC socket object that can be reclaimed and read through.\nI:H - The same UAF is exercised by smc_switch_to_fallback(), which writes clcsock fields and splices wait-queues through the freed pointer, enabling heap corruption and control-flow hijacking primitives.\nA:H - The race reliably produces kernel NULL pointer dereference or UAF oops/panic (as in the reported smc_setsockopt crash), causing full availability loss." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/smc/af_smc.c" ], "versions": [ { "version": "fd57770dd198f5b2ddd5b9e6bf282cf98d63adb9", "lessThan": "38f0bdd548fd2ef5d481b88d8a2bfef968452e34", "status": "affected", "versionType": "git" }, { "version": "fd57770dd198f5b2ddd5b9e6bf282cf98d63adb9", "lessThan": "4284225cd8001e134f5cf533a7cd244bbb654d0f", "status": "affected", "versionType": "git" }, { "version": "fd57770dd198f5b2ddd5b9e6bf282cf98d63adb9", "lessThan": "c0bf3d8a943b6f2e912b7c1de03e2ef28e76f760", "status": "affected", "versionType": "git" }, { "version": "d1d004585b40c212b338fc8a40cbaaf230ea4703", "status": "affected", "versionType": "git" }, { "version": "4.19.299", "lessThan": "4.20", "status": "affected", "versionType": "semver" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/smc/af_smc.c" ], "versions": [ { "version": "5.1", "status": "affected" }, { "version": "0", "lessThan": "5.1", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.19", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.16.5", "lessThanOrEqual": "5.16.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.17", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.1", "versionEndExcluding": "5.15.19" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.1", "versionEndExcluding": "5.16.5" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.1", "versionEndExcluding": "5.17" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.19.299" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/38f0bdd548fd2ef5d481b88d8a2bfef968452e34" }, { "url": "https://git.kernel.org/stable/c/4284225cd8001e134f5cf533a7cd244bbb654d0f" }, { "url": "https://git.kernel.org/stable/c/c0bf3d8a943b6f2e912b7c1de03e2ef28e76f760" } ], "title": "net/smc: Transitional solution for clcsock race issue", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-03T15:25:00.333Z" }, "title": "CVE Program Container", "references": [ { "url": "https://git.kernel.org/stable/c/38f0bdd548fd2ef5d481b88d8a2bfef968452e34", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/4284225cd8001e134f5cf533a7cd244bbb654d0f", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/c0bf3d8a943b6f2e912b7c1de03e2ef28e76f760", "tags": [ "x_transferred" ] } ] }, { "metrics": [ { "other": { "type": "ssvc", "content": { "id": "CVE-2022-48751", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "version": "2.0.3", "timestamp": "2024-09-10T17:10:28.867754Z" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-09-11T17:34:47.967Z" } } ] } }