{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2023-52483", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-02-20T12:30:33.301Z", "datePublished": "2024-02-29T05:43:13.861Z", "dateUpdated": "2026-08-05T09:10:11.713Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T09:10:11.713Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmctp: perform route lookups under a RCU read-side lock\n\nOur current route lookups (mctp_route_lookup and mctp_route_lookup_null)\ntraverse the net's route list without the RCU read lock held. This means\nthe route lookup is subject to preemption, resulting in an potential\ngrace period expiry, and so an eventual kfree() while we still have the\nroute pointer.\n\nAdd the proper read-side critical section locks around the route\nlookups, preventing premption and a possible parallel kfree.\n\nThe remaining net->mctp.routes accesses are already under a\nrcu_read_lock, or protected by the RTNL for updates.\n\nBased on an analysis from Sili Luo , where\nintroducing a delay in the route lookup could cause a UAF on\nsimultaneous sendmsg() and route deletion." } ], "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 UAF is reached locally via AF_MCTP sendmsg or by injecting ETH_P_MCTP frames into an attacker-controlled TUN (ARPHRD_NONE gets an mctp_dev) while deleting routes over netlink; MCTP bus exposure is adjacent but the highest-severity path is local.\nAC:L - The attacker controls both sides of the race—concurrent route lookup (sendmsg or TUN-injected RX) and RTM_DELROUTE/RTM_DELADDR deletion—and can retry until the UAF wins, so success does not depend on external conditions.\nPR:L - An unprivileged user can unshare user+net namespaces to gain CAP_NET_ADMIN for adding/deleting MCTP routes and create a TUN to trigger mctp_pkttype_receive→mctp_route_lookup without init-ns CAP_NET_RAW.\nUI:N - Exploitation requires no victim action; the attacker alone drives lookups and route deletions.\nS:U - This is a standard in-kernel UAF/privilege-escalation within the host kernel authority, with no VM escape or cross-boundary impact.\nC:H - Use-after-free of mctp_route lets an attacker reclaim the object and leak or read kernel memory through the dangling reference.\nI:H - mctp_route contains an output function pointer invoked as rt->output(rt, skb) after lookup, so a reclaimed UAF object yields a direct kernel control-flow hijack primitive.\nA:H - The UAF can oops/panic the kernel during list walk or when the dangling route pointer is dereferenced, fully impacting availability." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/mctp/route.c" ], "versions": [ { "version": "889b7da23abf92faf34491df95733bda63639e32", "lessThan": "6c52b12159049046483fdb0c411a0a1869c41a67", "status": "affected", "versionType": "git" }, { "version": "889b7da23abf92faf34491df95733bda63639e32", "lessThan": "1db0724a01b558feb1ecae551782add1951a114a", "status": "affected", "versionType": "git" }, { "version": "889b7da23abf92faf34491df95733bda63639e32", "lessThan": "2405f64a95a7a094eb24cba9bcfaffd1ea264de4", "status": "affected", "versionType": "git" }, { "version": "889b7da23abf92faf34491df95733bda63639e32", "lessThan": "5093bbfc10ab6636b32728e35813cbd79feb063c", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/mctp/route.c" ], "versions": [ { "version": "5.15", "status": "affected" }, { "version": "0", "lessThan": "5.15", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.137", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.59", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.5.8", "lessThanOrEqual": "6.5.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6", "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": "5.15", "versionEndExcluding": "5.15.137" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.1.59" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.5.8" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15", "versionEndExcluding": "6.6" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/6c52b12159049046483fdb0c411a0a1869c41a67" }, { "url": "https://git.kernel.org/stable/c/1db0724a01b558feb1ecae551782add1951a114a" }, { "url": "https://git.kernel.org/stable/c/2405f64a95a7a094eb24cba9bcfaffd1ea264de4" }, { "url": "https://git.kernel.org/stable/c/5093bbfc10ab6636b32728e35813cbd79feb063c" } ], "title": "mctp: perform route lookups under a RCU read-side lock", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "title": "CISA ADP Vulnrichment", "metrics": [ { "other": { "type": "ssvc", "content": { "id": "CVE-2023-52483", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "version": "2.0.3", "timestamp": "2024-03-01T17:49:14.175624Z" } } } ], "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-06-04T17:23:10.750Z" } }, { "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-02T23:03:20.402Z" }, "title": "CVE Program Container", "references": [ { "url": "https://git.kernel.org/stable/c/6c52b12159049046483fdb0c411a0a1869c41a67", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/1db0724a01b558feb1ecae551782add1951a114a", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/2405f64a95a7a094eb24cba9bcfaffd1ea264de4", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/5093bbfc10ab6636b32728e35813cbd79feb063c", "tags": [ "x_transferred" ] } ] } ] } }