{ "dataType": "CVE_RECORD", "cveMetadata": { "cveId": "CVE-2023-52447", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-02-20T12:30:33.292Z", "datePublished": "2024-02-22T16:21:39.032Z", "dateUpdated": "2026-08-05T09:10:02.042Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T09:10:02.042Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbpf: Defer the free of inner map when necessary\n\nWhen updating or deleting an inner map in map array or map htab, the map\nmay still be accessed by non-sleepable program or sleepable program.\nHowever bpf_map_fd_put_ptr() decreases the ref-counter of the inner map\ndirectly through bpf_map_put(), if the ref-counter is the last one\n(which is true for most cases), the inner map will be freed by\nops->map_free() in a kworker. But for now, most .map_free() callbacks\ndon't use synchronize_rcu() or its variants to wait for the elapse of a\nRCU grace period, so after the invocation of ops->map_free completes,\nthe bpf program which is accessing the inner map may incur\nuse-after-free problem.\n\nFix the free of inner map by invoking bpf_map_free_deferred() after both\none RCU grace period and one tasks trace RCU grace period if the inner\nmap has been removed from the outer map before. The deferment is\naccomplished by using call_rcu() or call_rcu_tasks_trace() when\nreleasing the last ref-counter of bpf map. The newly-added rcu_head\nfield in bpf_map shares the same storage space with work field to\nreduce the size of bpf_map." } ], "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 only through the local bpf() syscall (BPF_MAP_UPDATE_ELEM/DELETE_ELEM on ARRAY_OF_MAPS or HASH_OF_MAPS while a concurrently running BPF program holds the old inner map); there is no network or adjacent-protocol path into bpf_map_fd_put_ptr().\nAC:L - The attacker fully controls both sides of the race—one thread updating/deleting the outer map entry while another triggers the attached BPF program (as demonstrated by the upstream map_in_map selftest)—so no attacker-uncontrollable timing or memory-layout condition is required.\nPR:L - ARRAY_OF_MAPS/HASH_OF_MAPS are in map_create()'s explicitly unprivileged branch, and with unprivileged_bpf_disabled=0 (default on affected 5.9–5.15 kernels and common on Android/embedded) a plain local user can create them and drive the UAF via SOCKET_FILTER; CAP_BPF is otherwise a delegatable non-root capability routinely granted to containers and agents.\nUI:N - The attacker creates the maps, loads/attaches the program, and performs the concurrent update/delete themselves; no separate victim action is required.\nS:U - This is a standard host-kernel use-after-free privilege escalation within the same OS security authority, with no VM escape, IOMMU bypass, or other cross-boundary impact.\nC:H - The inner map (e.g. bpf_array) is freed via array_map_free()/htab_map_free() while a BPF program still dereferences it (KASAN slab-UAF), giving the attacker control over a reclaimable kernel object and enabling arbitrary read primitives.\nI:H - The same heap UAF of the inner map object is sprayable and exploitable for arbitrary write and control-flow hijacking once the freed map memory is reclaimed under attacker control.\nA:H - Even without a full exploit, concurrent use of the prematurely freed inner map causes kernel oops/KASAN faults (as shown in the selftest report in array_map_update_elem), fully denying availability." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "include/linux/bpf.h", "kernel/bpf/map_in_map.c", "kernel/bpf/syscall.c" ], "versions": [ { "version": "bba1dc0b55ac462d24ed1228ad49800c238cd6d7", "lessThan": "90c445799fd1dc214d7c6279c144e33a35e29ef2", "status": "affected", "versionType": "git" }, { "version": "bba1dc0b55ac462d24ed1228ad49800c238cd6d7", "lessThan": "37d98fb9c3144c0fddf7f6e99aece9927ac8dce6", "status": "affected", "versionType": "git" }, { "version": "bba1dc0b55ac462d24ed1228ad49800c238cd6d7", "lessThan": "62fca83303d608ad4fec3f7428c8685680bb01b0", "status": "affected", "versionType": "git" }, { "version": "bba1dc0b55ac462d24ed1228ad49800c238cd6d7", "lessThan": "f91cd728b10c51f6d4a39957ccd56d1e802fc8ee", "status": "affected", "versionType": "git" }, { "version": "bba1dc0b55ac462d24ed1228ad49800c238cd6d7", "lessThan": "bfd9b20c4862f41d4590fde11d70a5eeae53dcc5", "status": "affected", "versionType": "git" }, { "version": "bba1dc0b55ac462d24ed1228ad49800c238cd6d7", "lessThan": "876673364161da50eed6b472d746ef88242b2368", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "include/linux/bpf.h", "kernel/bpf/map_in_map.c", "kernel/bpf/syscall.c" ], "versions": [ { "version": "5.9", "status": "affected" }, { "version": "0", "lessThan": "5.9", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.214", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.153", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.75", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.14", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.7.2", "lessThanOrEqual": "6.7.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.8", "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": "5.9", "versionEndExcluding": "5.10.214" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.9", "versionEndExcluding": "5.15.153" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.9", "versionEndExcluding": "6.1.75" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.9", "versionEndExcluding": "6.6.14" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.9", "versionEndExcluding": "6.7.2" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.9", "versionEndExcluding": "6.8" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/90c445799fd1dc214d7c6279c144e33a35e29ef2" }, { "url": "https://git.kernel.org/stable/c/37d98fb9c3144c0fddf7f6e99aece9927ac8dce6" }, { "url": "https://git.kernel.org/stable/c/62fca83303d608ad4fec3f7428c8685680bb01b0" }, { "url": "https://git.kernel.org/stable/c/f91cd728b10c51f6d4a39957ccd56d1e802fc8ee" }, { "url": "https://git.kernel.org/stable/c/bfd9b20c4862f41d4590fde11d70a5eeae53dcc5" }, { "url": "https://git.kernel.org/stable/c/876673364161da50eed6b472d746ef88242b2368" } ], "title": "bpf: Defer the free of inner map when necessary", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "problemTypes": [ { "descriptions": [ { "type": "CWE", "cweId": "CWE-416", "lang": "en", "description": "CWE-416 Use After Free" } ] } ], "affected": [ { "vendor": "linux", "product": "linux_kernel", "cpes": [ "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*" ], "defaultStatus": "unaffected", "versions": [ { "version": "bba1dc0b55ac", "status": "affected", "lessThan": "90c445799fd1", "versionType": "git" }, { "version": "bba1dc0b55ac", "status": "affected", "lessThan": "37d98fb9c314", "versionType": "git" }, { "version": "bba1dc0b55ac", "status": "affected", "lessThan": "62fca83303d6", "versionType": "git" }, { "version": "bba1dc0b55ac", "status": "affected", "lessThan": "f91cd728b10c", "versionType": "git" }, { "version": "bba1dc0b55ac", "status": "affected", "lessThan": "bfd9b20c4862", "versionType": "git" }, { "version": "bba1dc0b55ac", "status": "affected", "lessThan": "876673364161", "versionType": "git" } ] }, { "vendor": "linux", "product": "linux_kernel", "cpes": [ "cpe:2.3:o:linux:linux_kernel:5.9:*:*:*:*:*:*:*" ], "defaultStatus": "affected", "versions": [ { "version": "5.9", "status": "affected" } ] }, { "vendor": "linux", "product": "linux_kernel", "cpes": [ "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*" ], "defaultStatus": "affected", "versions": [ { "version": "0", "status": "unaffected", "lessThan": "5.9", "versionType": "custom" }, { "version": "5.10.214", "status": "unaffected", "lessThanOrEqual": "5.10.*", "versionType": "custom" }, { "version": "5.15.153", "status": "unaffected", "lessThanOrEqual": "5.15.*", "versionType": "custom" }, { "version": "6.1.75", "status": "unaffected", "lessThanOrEqual": "6.1.*", "versionType": "custom" }, { "version": "6.6.14", "status": "unaffected", "lessThanOrEqual": "6.6.*", "versionType": "custom" }, { "version": "6.7.2", "status": "unaffected", "lessThanOrEqual": "6.7.*", "versionType": "custom" }, { "version": "6.8", "status": "unaffected", "lessThanOrEqual": "*", "versionType": "custom" } ] } ], "metrics": [ { "cvssV3_1": { "scope": "UNCHANGED", "version": "3.1", "baseScore": 6.7, "attackVector": "LOCAL", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "HIGH", "confidentialityImpact": "HIGH" } }, { "other": { "type": "ssvc", "content": { "timestamp": "2024-10-15T21:02:24.907266Z", "id": "CVE-2023-52447", "options": [ { "Exploitation": "poc" }, { "Automatable": "no" }, { "Technical Impact": "total" } ], "role": "CISA Coordinator", "version": "2.0.3" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-10-15T21:08:15.323Z" } }, { "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-02T22:55:41.700Z" }, "title": "CVE Program Container", "references": [ { "url": "https://git.kernel.org/stable/c/90c445799fd1dc214d7c6279c144e33a35e29ef2", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/37d98fb9c3144c0fddf7f6e99aece9927ac8dce6", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/62fca83303d608ad4fec3f7428c8685680bb01b0", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/f91cd728b10c51f6d4a39957ccd56d1e802fc8ee", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/bfd9b20c4862f41d4590fde11d70a5eeae53dcc5", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/876673364161da50eed6b472d746ef88242b2368", "tags": [ "x_transferred" ] }, { "url": "https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html", "tags": [ "x_transferred" ] } ] }, { "x_adpType": "supplier", "providerMetadata": { "orgId": "0b142b55-0307-4c5a-b3c9-f314f3fb7c5e", "shortName": "siemens-SADP", "dateUpdated": "2026-05-12T11:21:39.003Z" }, "affected": [ { "vendor": "Siemens", "product": "SIMATIC S7-1500 TM MFP - GNU/Linux subsystem", "versions": [ { "status": "affected", "version": "0", "lessThan": "*", "versionType": "custom" } ], "defaultStatus": "unknown" } ], "references": [ { "url": "https://cert-portal.siemens.com/productcert/html/ssa-265688.html" } ] } ] }, "dataVersion": "5.2" }