{"id":"CVE-2022-49390","state":"PUBLISHED","title":"macsec: fix UAF bug for real_dev","description":"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.","publishedAt":"2025-02-26T02:11:23.327Z","updatedAt":"2026-08-05T08:54:59.892Z","severity":{"score":7.8,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","source":"Linux"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"2bce1ebed17da54c65042ec2b962e3234bad5b47","status":"affected","lessThan":"78933cbc143b82d02330e00900d2fd08f2682f4e","versionType":"git"},{"version":"2bce1ebed17da54c65042ec2b962e3234bad5b47","status":"affected","lessThan":"d130282179aa6051449ac8f8df1115769998a665","versionType":"git"},{"version":"2bce1ebed17da54c65042ec2b962e3234bad5b47","status":"affected","lessThan":"196a888ca6571deb344468e1d7138e3273206335","versionType":"git"},{"version":"1861904a6092ed411203c6a02c75bfc45b27cc3c","status":"affected","versionType":"git"},{"version":"3a2675a2d97a68332fa5c33043038bfeb31455a8","status":"affected","versionType":"git"},{"version":"b0add6db3d5ec4561cab257358871a9d3df7f0a3","status":"affected","versionType":"git"},{"version":"4.14.154","status":"affected","lessThan":"4.15","versionType":"semver"},{"version":"4.19.84","status":"affected","lessThan":"4.20","versionType":"semver"},{"version":"5.3.11","status":"affected","lessThan":"5.4","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/macsec.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.4","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.4","versionType":"semver"},{"version":"5.17.15","status":"unaffected","lessThanOrEqual":"5.17.*","versionType":"semver"},{"version":"5.18.3","status":"unaffected","lessThanOrEqual":"5.18.*","versionType":"semver"},{"version":"5.19","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/macsec.c"]}],"references":["https://git.kernel.org/stable/c/78933cbc143b82d02330e00900d2fd08f2682f4e","https://git.kernel.org/stable/c/d130282179aa6051449ac8f8df1115769998a665","https://git.kernel.org/stable/c/196a888ca6571deb344468e1d7138e3273206335"],"weaknesses":["CWE-416"],"ingestedAt":"2026-10-29T20:05:26.763Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2022/49xxx/CVE-2022-49390.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2022-49390","state":"PUBLISHED","datePublished":"2025-02-26T02:11:23.327Z","dateUpdated":"2026-08-05T08:54:59.892Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2025-02-26T02:08:31.561Z"},"containers":{"cna":{"title":"macsec: fix UAF bug for real_dev","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."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"2bce1ebed17da54c65042ec2b962e3234bad5b47","status":"affected","lessThan":"78933cbc143b82d02330e00900d2fd08f2682f4e","versionType":"git"},{"version":"2bce1ebed17da54c65042ec2b962e3234bad5b47","status":"affected","lessThan":"d130282179aa6051449ac8f8df1115769998a665","versionType":"git"},{"version":"2bce1ebed17da54c65042ec2b962e3234bad5b47","status":"affected","lessThan":"196a888ca6571deb344468e1d7138e3273206335","versionType":"git"},{"version":"1861904a6092ed411203c6a02c75bfc45b27cc3c","status":"affected","versionType":"git"},{"version":"3a2675a2d97a68332fa5c33043038bfeb31455a8","status":"affected","versionType":"git"},{"version":"b0add6db3d5ec4561cab257358871a9d3df7f0a3","status":"affected","versionType":"git"},{"version":"4.14.154","status":"affected","lessThan":"4.15","versionType":"semver"},{"version":"4.19.84","status":"affected","lessThan":"4.20","versionType":"semver"},{"version":"5.3.11","status":"affected","lessThan":"5.4","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/macsec.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.4","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.4","versionType":"semver"},{"version":"5.17.15","status":"unaffected","lessThanOrEqual":"5.17.*","versionType":"semver"},{"version":"5.18.3","status":"unaffected","lessThanOrEqual":"5.18.*","versionType":"semver"},{"version":"5.19","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/net/macsec.c"]}],"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"}],"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."}]}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-08-05T08:54:59.892Z"},"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"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","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":[{"cweId":"CWE-416","lang":"en","type":"CWE","description":"CWE-416 Use After Free"}]}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2025-02-27T18:02:28.747Z"}}]}}}