{"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  <TASK>\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  </TASK>\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"}}]}}