{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2022-50780", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-12-24T13:02:21.548Z", "datePublished": "2025-12-24T13:06:08.552Z", "dateUpdated": "2026-08-05T08:59:45.573Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T08:59:45.573Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: fix UAF issue in nfqnl_nf_hook_drop() when ops_init() failed\n\nWhen the ops_init() interface is invoked to initialize the net, but\nops->init() fails, data is released. However, the ptr pointer in\nnet->gen is invalid. In this case, when nfqnl_nf_hook_drop() is invoked\nto release the net, invalid address access occurs.\n\nThe process is as follows:\nsetup_net()\n\tops_init()\n\t\tdata = kzalloc(...) ---> alloc \"data\"\n\t\tnet_assign_generic() ---> assign \"date\" to ptr in net->gen\n\t\t...\n\t\tops->init() ---> failed\n\t\t...\n\t\tkfree(data); ---> ptr in net->gen is invalid\n\t...\n\tops_exit_list()\n\t\t...\n\t\tnfqnl_nf_hook_drop()\n\t\t\t*q = nfnl_queue_pernet(net) ---> q is invalid\n\nThe following is the Call Trace information:\nBUG: KASAN: use-after-free in nfqnl_nf_hook_drop+0x264/0x280\nRead of size 8 at addr ffff88810396b240 by task ip/15855\nCall Trace:\n\ndump_stack_lvl+0x8e/0xd1\nprint_report+0x155/0x454\nkasan_report+0xba/0x1f0\nnfqnl_nf_hook_drop+0x264/0x280\nnf_queue_nf_hook_drop+0x8b/0x1b0\n__nf_unregister_net_hook+0x1ae/0x5a0\nnf_unregister_net_hooks+0xde/0x130\nops_exit_list+0xb0/0x170\nsetup_net+0x7ac/0xbd0\ncopy_net_ns+0x2e6/0x6b0\ncreate_new_namespaces+0x382/0xa50\nunshare_nsproxy_namespaces+0xa6/0x1c0\nksys_unshare+0x3a4/0x7e0\n__x64_sys_unshare+0x2d/0x40\ndo_syscall_64+0x35/0x80\nentry_SYSCALL_64_after_hwframe+0x46/0xb0\n\n\nAllocated by task 15855:\nkasan_save_stack+0x1e/0x40\nkasan_set_track+0x21/0x30\n__kasan_kmalloc+0xa1/0xb0\n__kmalloc+0x49/0xb0\nops_init+0xe7/0x410\nsetup_net+0x5aa/0xbd0\ncopy_net_ns+0x2e6/0x6b0\ncreate_new_namespaces+0x382/0xa50\nunshare_nsproxy_namespaces+0xa6/0x1c0\nksys_unshare+0x3a4/0x7e0\n__x64_sys_unshare+0x2d/0x40\ndo_syscall_64+0x35/0x80\nentry_SYSCALL_64_after_hwframe+0x46/0xb0\n\nFreed by task 15855:\nkasan_save_stack+0x1e/0x40\nkasan_set_track+0x21/0x30\nkasan_save_free_info+0x2a/0x40\n____kasan_slab_free+0x155/0x1b0\nslab_free_freelist_hook+0x11b/0x220\n__kmem_cache_free+0xa4/0x360\nops_init+0xb9/0x410\nsetup_net+0x5aa/0xbd0\ncopy_net_ns+0x2e6/0x6b0\ncreate_new_namespaces+0x382/0xa50\nunshare_nsproxy_namespaces+0xa6/0x1c0\nksys_unshare+0x3a4/0x7e0\n__x64_sys_unshare+0x2d/0x40\ndo_syscall_64+0x35/0x80\nentry_SYSCALL_64_after_hwframe+0x46/0xb0" } ], "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 via the local unshare/clone CLONE_NEWNET path (ksys_unshare → copy_net_ns → setup_net → ops_init), not by processing remote packets or an adjacent-network protocol.\nAC:L - An attacker who can create network namespaces can induce the ops->init() failure (e.g., memory pressure so nfnl_queue_net_init's proc_create_net fails after allocation) and spray the freed object during the synchronize_rcu() window before nfqnl_nf_hook_drop runs; no conditions outside attacker influence are required.\nPR:L - Creating a netns requires CAP_SYS_ADMIN only in the associated user namespace, which an unprivileged user obtains via CLONE_NEWUSER (unshare -Urn); real init-namespace root is not required.\nUI:N - The attacker triggers the vulnerability directly with their own unshare/netns creation; no separate victim action is needed.\nS:U - Impact is confined to the local kernel's memory/authority (UAF in netns/netfilter teardown); this is not a VM escape, IOMMU bypass, or other cross-boundary break.\nC:H - This is a use-after-free of the nfnl_queue_net object with an RCU grace-period window for heap reuse, enabling disclosure of reclaimed object contents per UAF scoring guidance.\nI:H - The same UAF is reachable while nfqnl_nf_hook_drop walks instance_table and calls nfqnl_flush on entries, so heap spray of fake queue/instance state can yield corruption and control-flow hijack primitives.\nA:H - Dereferencing the dangling nfnl_queue_pernet() pointer causes a kernel KASAN/UAF oops or panic, which is high availability impact." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/core/net_namespace.c" ], "versions": [ { "version": "f875bae065334907796da12523f9df85c89f5712", "lessThan": "5a2ea549be94924364f6911227d99be86e8cf34a", "status": "affected", "versionType": "git" }, { "version": "f875bae065334907796da12523f9df85c89f5712", "lessThan": "97ad240fd9aa9214497d14af2b91608e20856cac", "status": "affected", "versionType": "git" }, { "version": "f875bae065334907796da12523f9df85c89f5712", "lessThan": "c3edc6e808209aa705185f732e682a370981ced1", "status": "affected", "versionType": "git" }, { "version": "f875bae065334907796da12523f9df85c89f5712", "lessThan": "a1e18acb0246bfb001b08b8b1b830b5ec92a0f13", "status": "affected", "versionType": "git" }, { "version": "f875bae065334907796da12523f9df85c89f5712", "lessThan": "4a4df5e78712de39d6f90d6a64b5eb48dca03bd5", "status": "affected", "versionType": "git" }, { "version": "f875bae065334907796da12523f9df85c89f5712", "lessThan": "d266935ac43d57586e311a087510fe6a084af742", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/core/net_namespace.c" ], "versions": [ { "version": "2.6.33", "status": "affected" }, { "version": "0", "lessThan": "2.6.33", "status": "unaffected", "versionType": "semver" }, { "version": "4.19.264", "lessThanOrEqual": "4.19.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.4.223", "lessThanOrEqual": "5.4.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.153", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.77", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.0.7", "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": "2.6.33", "versionEndExcluding": "4.19.264" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.33", "versionEndExcluding": "5.4.223" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.33", "versionEndExcluding": "5.10.153" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.33", "versionEndExcluding": "5.15.77" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.33", "versionEndExcluding": "6.0.7" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.33", "versionEndExcluding": "6.1" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/5a2ea549be94924364f6911227d99be86e8cf34a" }, { "url": "https://git.kernel.org/stable/c/97ad240fd9aa9214497d14af2b91608e20856cac" }, { "url": "https://git.kernel.org/stable/c/c3edc6e808209aa705185f732e682a370981ced1" }, { "url": "https://git.kernel.org/stable/c/a1e18acb0246bfb001b08b8b1b830b5ec92a0f13" }, { "url": "https://git.kernel.org/stable/c/4a4df5e78712de39d6f90d6a64b5eb48dca03bd5" }, { "url": "https://git.kernel.org/stable/c/d266935ac43d57586e311a087510fe6a084af742" } ], "title": "net: fix UAF issue in nfqnl_nf_hook_drop() when ops_init() failed", "x_generator": { "engine": "bippy-1.2.0" } } } }