237 lines
12 KiB
JSON
237 lines
12 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2022-48751",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2024-06-20T11:09:39.057Z",
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"datePublished": "2024-06-20T11:13:32.575Z",
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"dateUpdated": "2026-08-05T08:52:07.796Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T08:52:07.796Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"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."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7.8,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"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."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"net/smc/af_smc.c"
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],
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"version": "fd57770dd198f5b2ddd5b9e6bf282cf98d63adb9",
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"version": "d1d004585b40c212b338fc8a40cbaaf230ea4703",
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"version": "4.19.299",
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"lessThan": "4.20",
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"status": "affected",
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"programFiles": [
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"version": "0",
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"status": "unaffected",
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},
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{
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"version": "5.15.19",
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"lessThanOrEqual": "5.15.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.16.5",
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"lessThanOrEqual": "5.16.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.17",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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"url": "https://git.kernel.org/stable/c/38f0bdd548fd2ef5d481b88d8a2bfef968452e34"
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}
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"title": "net/smc: Transitional solution for clcsock race issue",
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"dateUpdated": "2024-08-03T15:25:00.333Z"
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"id": "CVE-2022-48751",
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"options": [
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{
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