{ "dataType": "CVE_RECORD", "cveMetadata": { "cveId": "CVE-2023-52656", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-03-06T09:52:12.099Z", "datePublished": "2024-05-13T13:12:35.333Z", "dateUpdated": "2026-08-05T09:10:53.267Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T09:10:53.267Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nio_uring: drop any code related to SCM_RIGHTS\n\nThis is dead code after we dropped support for passing io_uring fds\nover SCM_RIGHTS, get rid of it." } ], "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 vulnerable SCM accounting path is reached via local io_uring syscalls (io_uring_setup and io_uring_register with IORING_REGISTER_FILES), not via network packet processing.\nAC:L - An unprivileged attacker fully controls both sides of the unix GC / unix_stream_read_generic race by creating the ring, registering unix sockets as fixed files, and driving concurrent SCM/socket operations, so success does not depend on external conditions.\nPR:L - io_uring is available to unprivileged local users by default (sysctl io_uring_disabled=0); registering files and creating AF_UNIX sockets requires only a normal user account.\nUI:N - Exploitation requires no victim action; the attacker triggers the bug entirely through their own syscalls.\nS:U - Impact remains within the local kernel's security authority (standard local privilege escalation), with no VM/IOMMU/sandbox boundary crossed.\nC:H - The bug is a use-after-free in the io_uring/AF_UNIX SCM_RIGHTS GC interaction; UAF of socket/file objects enables arbitrary kernel memory read primitives.\nI:H - The same UAF is exploitable for heap reuse and arbitrary write / control-flow hijacking, matching the severity already assigned to sibling CVE-2023-52654 for this vulnerability class.\nA:H - Triggering the UAF/race reliably causes kernel oops, panic, or hang even when not fully exploited for code execution." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "include/linux/io_uring_types.h", "io_uring/filetable.c", "io_uring/io_uring.c", "io_uring/rsrc.c", "io_uring/rsrc.h" ], "versions": [ { "version": "2b188cc1bb857a9d4701ae59aa7768b5124e262e", "lessThan": "cfb24022bb2c31f1f555dc6bc3cc5e2547446fb3", "status": "affected", "versionType": "git" }, { "version": "2b188cc1bb857a9d4701ae59aa7768b5124e262e", "lessThan": "a6771f343af90a25f3a14911634562bb5621df02", "status": "affected", "versionType": "git" }, { "version": "2b188cc1bb857a9d4701ae59aa7768b5124e262e", "lessThan": "d909d381c3152393421403be4b6435f17a2378b4", "status": "affected", "versionType": "git" }, { "version": "2b188cc1bb857a9d4701ae59aa7768b5124e262e", "lessThan": "a3812a47a32022ca76bf46ddacdd823dc2aabf8b", "status": "affected", "versionType": "git" }, { "version": "2b188cc1bb857a9d4701ae59aa7768b5124e262e", "lessThan": "6fc19b3d8a45ff0e5d50ec8184cee1d5eac1a8ba", "status": "affected", "versionType": "git" }, { "version": "2b188cc1bb857a9d4701ae59aa7768b5124e262e", "lessThan": "88c49d9c896143cdc0f77197c4dcf24140375e89", "status": "affected", "versionType": "git" }, { "version": "2b188cc1bb857a9d4701ae59aa7768b5124e262e", "lessThan": "6e5e6d274956305f1fc0340522b38f5f5be74bdb", "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/io_uring_types.h", "io_uring/filetable.c", "io_uring/io_uring.c", "io_uring/rsrc.c", "io_uring/rsrc.h" ], "versions": [ { "version": "5.1", "status": "affected" }, { "version": "0", "lessThan": "5.1", "status": "unaffected", "versionType": "semver" }, { "version": "5.4.273", "lessThanOrEqual": "5.4.*", "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": "6.1.83", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.23", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.7.11", "lessThanOrEqual": "6.7.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.8", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { 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