{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2022-50234", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-06-18T10:57:27.432Z", "datePublished": "2025-09-15T14:01:38.199Z", "dateUpdated": "2026-08-05T08:57:50.462Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T08:57:50.462Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nio_uring/af_unix: defer registered files gc to io_uring release\n\nInstead of putting io_uring's registered files in unix_gc() we want it\nto be done by io_uring itself. The trick here is to consider io_uring\nregistered files for cycle detection but not actually putting them down.\nBecause io_uring can't register other ring instances, this will remove\nall refs to the ring file triggering the ->release path and clean up\nwith io_ring_ctx_free().\n\n[axboe: add kerneldoc comment to skb, fold in skb leak fix]" } ], "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 local io_uring syscalls (io_uring_setup/register/enter) combined with AF_UNIX SCM_RIGHTS cycle construction; it is not reachable via network packets or a remote protocol parser.\nAC:L - The attacker fully controls both sides of the race—stalling the in-flight io_uring request (userfaultfd/FUSE/inode lock) and triggering unix_gc via crafted inflight cycles—so success does not depend on conditions outside their influence; public exploits demonstrate reliable triggering.\nPR:L - io_uring_setup, IORING_REGISTER_FILES, and AF_UNIX socket operations require only an unprivileged local account with no capabilities; the vulnerable kernels had no io_uring_disabled gate.\nUI:N - The attacker drives the entire sequence (ring setup, file registration, cycle creation, stalled request, and GC trigger) themselves with no action required from another user.\nS:U - This is a host-kernel use-after-free of struct file enabling local privilege escalation within the same kernel authority; it is not a VM escape, IOMMU bypass, or other cross-boundary compromise.\nC:H - The UAF leaves a dangling struct file pointer reclaimable via heap spray (DirtyCred), giving the attacker control over file object contents and enabling arbitrary file/credential disclosure primitives.\nI:H - Replacing the freed writable file with a privileged read-only file (e.g. /etc/passwd) after permission checks allows arbitrary file writes and reliable local privilege escalation, as shown by public exploits.\nA:H - Use of the dangling registered-file pointer after unix_gc frees it causes kernel oops/panic even without a full exploit, so availability impact is high." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "include/linux/skbuff.h", "io_uring/rsrc.c", "net/unix/garbage.c" ], "versions": [ { "version": "6b06314c47e141031be043539900d80d2c7ba10f", "lessThan": "04df9719df1865f6770af9bc7880874af0e594b2", "status": "affected", "versionType": "git" }, { "version": "6b06314c47e141031be043539900d80d2c7ba10f", "lessThan": "c378c479c5175833bb22ff71974cda47d7b05401", "status": "affected", "versionType": "git" }, { "version": "6b06314c47e141031be043539900d80d2c7ba10f", "lessThan": "813d8fe5d30388f73a21d3a2bf46b0a1fd72498c", "status": "affected", "versionType": "git" }, { "version": "6b06314c47e141031be043539900d80d2c7ba10f", "lessThan": "b4293c01ee0d0ecdd3cb5801e13f62271144667a", "status": "affected", "versionType": "git" }, { "version": "6b06314c47e141031be043539900d80d2c7ba10f", "lessThan": "75e94c7e8859e58aadc15a98cc9704edff47d4f2", "status": "affected", "versionType": "git" }, { "version": "6b06314c47e141031be043539900d80d2c7ba10f", "lessThan": "0091bfc81741b8d3aeb3b7ab8636f911b2de6e80", "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/skbuff.h", "io_uring/rsrc.c", "net/unix/garbage.c" ], "versions": [ { "version": "5.1", "status": "affected" }, { "version": "0", "lessThan": "5.1", "status": "unaffected", "versionType": "semver" }, { "version": "5.4.220", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.150", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.75", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.19.17", "lessThanOrEqual": "5.19.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.0.3", "lessThanOrEqual": "6.0.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1", "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": "5.4.220" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.1", "versionEndExcluding": "5.10.150" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.1", "versionEndExcluding": "5.15.75" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.1", "versionEndExcluding": "5.19.17" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.1", "versionEndExcluding": "6.0.3" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.1", "versionEndExcluding": "6.1" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/04df9719df1865f6770af9bc7880874af0e594b2" }, { "url": "https://git.kernel.org/stable/c/c378c479c5175833bb22ff71974cda47d7b05401" }, { "url": "https://git.kernel.org/stable/c/813d8fe5d30388f73a21d3a2bf46b0a1fd72498c" }, { "url": "https://git.kernel.org/stable/c/b4293c01ee0d0ecdd3cb5801e13f62271144667a" }, { "url": "https://git.kernel.org/stable/c/75e94c7e8859e58aadc15a98cc9704edff47d4f2" }, { "url": "https://git.kernel.org/stable/c/0091bfc81741b8d3aeb3b7ab8636f911b2de6e80" } ], "title": "io_uring/af_unix: defer registered files gc to io_uring release", "x_generator": { "engine": "bippy-1.2.0" } } } }