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CVE-2022-50780 (GCVE-0-2022-50780)

Vulnerability from cvelistv5 – Published: 2025-12-24 13:06 – Updated: 2026-08-05 08:59
VLAI
Title
net: fix UAF issue in nfqnl_nf_hook_drop() when ops_init() failed
Summary
In the Linux kernel, the following vulnerability has been resolved: net: fix UAF issue in nfqnl_nf_hook_drop() when ops_init() failed When the ops_init() interface is invoked to initialize the net, but ops->init() fails, data is released. However, the ptr pointer in net->gen is invalid. In this case, when nfqnl_nf_hook_drop() is invoked to release the net, invalid address access occurs. The process is as follows: setup_net() ops_init() data = kzalloc(...) ---> alloc "data" net_assign_generic() ---> assign "date" to ptr in net->gen ... ops->init() ---> failed ... kfree(data); ---> ptr in net->gen is invalid ... ops_exit_list() ... nfqnl_nf_hook_drop() *q = nfnl_queue_pernet(net) ---> q is invalid The following is the Call Trace information: BUG: KASAN: use-after-free in nfqnl_nf_hook_drop+0x264/0x280 Read of size 8 at addr ffff88810396b240 by task ip/15855 Call Trace: <TASK> dump_stack_lvl+0x8e/0xd1 print_report+0x155/0x454 kasan_report+0xba/0x1f0 nfqnl_nf_hook_drop+0x264/0x280 nf_queue_nf_hook_drop+0x8b/0x1b0 __nf_unregister_net_hook+0x1ae/0x5a0 nf_unregister_net_hooks+0xde/0x130 ops_exit_list+0xb0/0x170 setup_net+0x7ac/0xbd0 copy_net_ns+0x2e6/0x6b0 create_new_namespaces+0x382/0xa50 unshare_nsproxy_namespaces+0xa6/0x1c0 ksys_unshare+0x3a4/0x7e0 __x64_sys_unshare+0x2d/0x40 do_syscall_64+0x35/0x80 entry_SYSCALL_64_after_hwframe+0x46/0xb0 </TASK> Allocated by task 15855: kasan_save_stack+0x1e/0x40 kasan_set_track+0x21/0x30 __kasan_kmalloc+0xa1/0xb0 __kmalloc+0x49/0xb0 ops_init+0xe7/0x410 setup_net+0x5aa/0xbd0 copy_net_ns+0x2e6/0x6b0 create_new_namespaces+0x382/0xa50 unshare_nsproxy_namespaces+0xa6/0x1c0 ksys_unshare+0x3a4/0x7e0 __x64_sys_unshare+0x2d/0x40 do_syscall_64+0x35/0x80 entry_SYSCALL_64_after_hwframe+0x46/0xb0 Freed by task 15855: kasan_save_stack+0x1e/0x40 kasan_set_track+0x21/0x30 kasan_save_free_info+0x2a/0x40 ____kasan_slab_free+0x155/0x1b0 slab_free_freelist_hook+0x11b/0x220 __kmem_cache_free+0xa4/0x360 ops_init+0xb9/0x410 setup_net+0x5aa/0xbd0 copy_net_ns+0x2e6/0x6b0 create_new_namespaces+0x382/0xa50 unshare_nsproxy_namespaces+0xa6/0x1c0 ksys_unshare+0x3a4/0x7e0 __x64_sys_unshare+0x2d/0x40 do_syscall_64+0x35/0x80 entry_SYSCALL_64_after_hwframe+0x46/0xb0
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: f875bae065334907796da12523f9df85c89f5712 , < 5a2ea549be94924364f6911227d99be86e8cf34a (git)
Affected: f875bae065334907796da12523f9df85c89f5712 , < 97ad240fd9aa9214497d14af2b91608e20856cac (git)
Affected: f875bae065334907796da12523f9df85c89f5712 , < c3edc6e808209aa705185f732e682a370981ced1 (git)
Affected: f875bae065334907796da12523f9df85c89f5712 , < a1e18acb0246bfb001b08b8b1b830b5ec92a0f13 (git)
Affected: f875bae065334907796da12523f9df85c89f5712 , < 4a4df5e78712de39d6f90d6a64b5eb48dca03bd5 (git)
Affected: f875bae065334907796da12523f9df85c89f5712 , < d266935ac43d57586e311a087510fe6a084af742 (git)
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Linux Linux Affected: 2.6.33
Unaffected: 0 , < 2.6.33 (semver)
Unaffected: 4.19.264 , ≤ 4.19.* (semver)
Unaffected: 5.4.223 , ≤ 5.4.* (semver)
Unaffected: 5.10.153 , ≤ 5.10.* (semver)
Unaffected: 5.15.77 , ≤ 5.15.* (semver)
Unaffected: 6.0.7 , ≤ 6.0.* (semver)
Unaffected: 6.1 , ≤ * (original_commit_for_fix)
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{
  "containers": {
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          "programFiles": [
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              "status": "unaffected",
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              "status": "unaffected",
              "version": "5.4.223",
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              "status": "unaffected",
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              "status": "unaffected",
              "version": "5.15.77",
              "versionType": "semver"
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              "status": "unaffected",
              "version": "6.0.7",
              "versionType": "semver"
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            {
              "lessThanOrEqual": "*",
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      "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-\u003einit() fails, data is released. However, the ptr pointer in\nnet-\u003egen 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(...)   ---\u003e alloc \"data\"\n\t\tnet_assign_generic()  ---\u003e assign \"date\" to ptr in net-\u003egen\n\t\t...\n\t\tops-\u003einit()           ---\u003e failed\n\t\t...\n\t\tkfree(data);          ---\u003e ptr in net-\u003egen 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) ---\u003e 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\u003cTASK\u003e\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\u003c/TASK\u003e\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": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The bug is reached via the local unshare/clone CLONE_NEWNET path (ksys_unshare \u2192 copy_net_ns \u2192 setup_net \u2192 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-\u003einit() failure (e.g., memory pressure so nfnl_queue_net_init\u0027s 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\u0027s 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."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T08:59:45.573Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "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"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2022-50780",
    "datePublished": "2025-12-24T13:06:08.552Z",
    "dateReserved": "2025-12-24T13:02:21.548Z",
    "dateUpdated": "2026-08-05T08:59:45.573Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2022-50780",
      "date": "2026-09-14",
      "epss": "0.00156",
      "percentile": "0.05157"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2022-50780\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-12-24T13:16:04.843\",\"lastModified\":\"2026-08-04T10:18:24.063\",\"vulnStatus\":\"Deferred\",\"cveTags\":[],\"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-\u003einit() fails, data is released. However, the ptr pointer in\\nnet-\u003egen 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(...)   ---\u003e alloc \\\"data\\\"\\n\\t\\tnet_assign_generic()  ---\u003e assign \\\"date\\\" to ptr in net-\u003egen\\n\\t\\t...\\n\\t\\tops-\u003einit()           ---\u003e failed\\n\\t\\t...\\n\\t\\tkfree(data);          ---\u003e ptr in net-\u003egen 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) ---\u003e 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\u003cTASK\u003e\\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\u003c/TASK\u003e\\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\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/core/net_namespace.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"f875bae065334907796da12523f9df85c89f5712\",\"lessThan\":\"5a2ea549be94924364f6911227d99be86e8cf34a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"f875bae065334907796da12523f9df85c89f5712\",\"lessThan\":\"97ad240fd9aa9214497d14af2b91608e20856cac\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"f875bae065334907796da12523f9df85c89f5712\",\"lessThan\":\"c3edc6e808209aa705185f732e682a370981ced1\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"f875bae065334907796da12523f9df85c89f5712\",\"lessThan\":\"a1e18acb0246bfb001b08b8b1b830b5ec92a0f13\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"f875bae065334907796da12523f9df85c89f5712\",\"lessThan\":\"4a4df5e78712de39d6f90d6a64b5eb48dca03bd5\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"f875bae065334907796da12523f9df85c89f5712\",\"lessThan\":\"d266935ac43d57586e311a087510fe6a084af742\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/core/net_namespace.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"2.6.33\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"2.6.33\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"4.19.264\",\"lessThanOrEqual\":\"4.19.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.4.223\",\"lessThanOrEqual\":\"5.4.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.153\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.77\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.0.7\",\"lessThanOrEqual\":\"6.0.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"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\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/4a4df5e78712de39d6f90d6a64b5eb48dca03bd5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/5a2ea549be94924364f6911227d99be86e8cf34a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/97ad240fd9aa9214497d14af2b91608e20856cac\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/a1e18acb0246bfb001b08b8b1b830b5ec92a0f13\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c3edc6e808209aa705185f732e682a370981ced1\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d266935ac43d57586e311a087510fe6a084af742\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-04T19:36:26+00:00",
      "cve": "CVE-2022-50780",
      "id": "CVE-2022-50780",
      "initial_release_date": "2022-01-01T00:00:00+00:00",
      "product_status:fixed": "279",
      "product_status:known_affected": "112",
      "product_status:known_not_affected": "76",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: net: fix UAF issue in nfqnl_nf_hook_drop() when ops_init() failed",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2022/cve-2022-50780.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-03T00:36:37Z",
      "cve": "CVE-2022-50780",
      "id": "CVE-2022-50780",
      "initial_release_date": "2025-12-25T01:03:30Z",
      "product_status:known_affected": "394",
      "product_status:known_not_affected": "492",
      "product_status:recommended": "66",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2022-50780",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2022-50780.json",
      "version": "16"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.