{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2022-49390", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-02-26T02:08:31.561Z", "datePublished": "2025-02-26T02:11:23.327Z", "dateUpdated": "2026-08-05T08:54:59.892Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T08:54:59.892Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmacsec: fix UAF bug for real_dev\n\nCreate a new macsec device but not get reference to real_dev. That can\nnot ensure that real_dev is freed after macsec. That will trigger the\nUAF bug for real_dev as following:\n\n==================================================================\nBUG: KASAN: use-after-free in macsec_get_iflink+0x5f/0x70 drivers/net/macsec.c:3662\nCall Trace:\n ...\n macsec_get_iflink+0x5f/0x70 drivers/net/macsec.c:3662\n dev_get_iflink+0x73/0xe0 net/core/dev.c:637\n default_operstate net/core/link_watch.c:42 [inline]\n rfc2863_policy+0x233/0x2d0 net/core/link_watch.c:54\n linkwatch_do_dev+0x2a/0x150 net/core/link_watch.c:161\n\nAllocated by task 22209:\n ...\n alloc_netdev_mqs+0x98/0x1100 net/core/dev.c:10549\n rtnl_create_link+0x9d7/0xc00 net/core/rtnetlink.c:3235\n veth_newlink+0x20e/0xa90 drivers/net/veth.c:1748\n\nFreed by task 8:\n ...\n kfree+0xd6/0x4d0 mm/slub.c:4552\n kvfree+0x42/0x50 mm/util.c:615\n device_release+0x9f/0x240 drivers/base/core.c:2229\n kobject_cleanup lib/kobject.c:673 [inline]\n kobject_release lib/kobject.c:704 [inline]\n kref_put include/linux/kref.h:65 [inline]\n kobject_put+0x1c8/0x540 lib/kobject.c:721\n netdev_run_todo+0x72e/0x10b0 net/core/dev.c:10327\n\nAfter commit faab39f63c1f (\"net: allow out-of-order netdev unregistration\")\nand commit e5f80fcf869a (\"ipv6: give an IPv6 dev to blackhole_netdev\"), we\ncan add dev_hold_track() in macsec_dev_init() and dev_put_track() in\nmacsec_free_netdev() to fix the problem." } ], "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 - Exploitation requires creating and tearing down macsec/veth netdevices via rtnetlink (ip link), which is a local syscall/netlink interface, not reachable from remote packet processing.\nAC:L - An attacker who creates a macsec device over a veth and then deletes the lower device fully controls both sides of the teardown that triggers the UAF; syzkaller hits this reliably without depending on conditions outside attacker influence.\nPR:L - Creating macsec requires CAP_NET_ADMIN, but that capability is checked in the network namespace's user_ns (netlink_net_capable/ns_capable), so an unprivileged user with user+net namespaces (unshare -Urn) can trigger it; macsec is also netnsok and autoloadable via rtnl-link-macsec.\nUI:N - The attacker triggers the bug entirely through their own netlink operations to create and destroy devices; no victim action is required.\nS:U - This is a standard in-kernel use-after-free enabling local privilege escalation within the same kernel security authority, not a VM/IOMMU/sandbox boundary escape.\nC:H - Use-after-free of the underlying net_device allows the freed object to be reclaimed and its contents controlled, enabling arbitrary kernel memory disclosure primitives.\nI:H - UAF of a large net_device object is exploitable via heap spraying for arbitrary write and control-flow hijacking, consistent with treating kernel UAFs as high integrity impact.\nA:H - The UAF is observed as a KASAN use-after-free in macsec_get_iflink during linkwatch processing and can cause kernel oops/panic even without full exploitation." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/net/macsec.c" ], "versions": [ { "version": "2bce1ebed17da54c65042ec2b962e3234bad5b47", "lessThan": "78933cbc143b82d02330e00900d2fd08f2682f4e", "status": "affected", "versionType": "git" }, { "version": "2bce1ebed17da54c65042ec2b962e3234bad5b47", "lessThan": "d130282179aa6051449ac8f8df1115769998a665", "status": "affected", "versionType": "git" }, { "version": "2bce1ebed17da54c65042ec2b962e3234bad5b47", "lessThan": "196a888ca6571deb344468e1d7138e3273206335", "status": "affected", "versionType": "git" }, { "version": "1861904a6092ed411203c6a02c75bfc45b27cc3c", "status": "affected", "versionType": "git" }, { "version": "3a2675a2d97a68332fa5c33043038bfeb31455a8", "status": "affected", "versionType": "git" }, { "version": "b0add6db3d5ec4561cab257358871a9d3df7f0a3", "status": "affected", "versionType": "git" }, { "version": "4.14.154", "lessThan": "4.15", "status": "affected", "versionType": "semver" }, { "version": "4.19.84", "lessThan": "4.20", "status": "affected", "versionType": "semver" }, { "version": "5.3.11", "lessThan": "5.4", "status": "affected", "versionType": "semver" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/net/macsec.c" ], "versions": [ { "version": "5.4", "status": "affected" }, { "version": "0", "lessThan": "5.4", "status": "unaffected", "versionType": "semver" }, { "version": "5.17.15", "lessThanOrEqual": "5.17.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.18.3", "lessThanOrEqual": "5.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.19", "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": "5.4", "versionEndExcluding": "5.17.15" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.4", "versionEndExcluding": "5.18.3" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.4", "versionEndExcluding": "5.19" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.14.154" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.19.84" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.3.11" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/78933cbc143b82d02330e00900d2fd08f2682f4e" }, { "url": "https://git.kernel.org/stable/c/d130282179aa6051449ac8f8df1115769998a665" }, { "url": "https://git.kernel.org/stable/c/196a888ca6571deb344468e1d7138e3273206335" } ], "title": "macsec: fix UAF bug for real_dev", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "cvssV3_1": { "scope": "UNCHANGED", "version": "3.1", "baseScore": 7.8, "attackVector": "LOCAL", "baseSeverity": "HIGH", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "integrityImpact": "HIGH", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "HIGH" } }, { "other": { "type": "ssvc", "content": { "id": "CVE-2022-49390", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "total" } ], "version": "2.0.3", "timestamp": "2025-02-27T17:58:33.560218Z" } } } ], "problemTypes": [ { "descriptions": [ { "lang": "en", "type": "CWE", "cweId": "CWE-416", "description": "CWE-416 Use After Free" } ] } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2025-02-27T18:02:28.747Z" } } ] } }