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CVE-2022-50780

Estado: AplazadaAlta (7.8)—

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

Detalles técnicos trazas, registros y código del informe original
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

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

🎯 Técnicas ATT&CK

Cómo se explota esta vulnerabilidad y qué consigue el atacante, en el lenguaje de MITRE ATT&CK.

Vulnerabilidad UAF local (AV:L/PR:L) en kernel Linux que causa DoS por acceso a memoria liberada tras fallar ops_init(), sin requiere escalada pero permite crash del sistema.

Inferido por nuestro agente de análisis a partir de la descripción oficial, el vector CVSS y la CWE, y comprobado por un supervisor. Puede contener errores.

🛡️ Mitigaciones ATT&CK que cubren estas técnicas

Threat Intelligence ProgramFilter Network TrafficExecution PreventionApplication Isolation and SandboxingExploit ProtectionUpdate Software

Tecnologías afectadas (1)

⚠ Inferidas por IA a partir de la descripción — NVD aún no ha analizado esta CVE; no son CPE verificados.

Linux — Linux KernelAI

Referencias

JSON original (NVD)

Mostrar
{
  "id": "CVE-2022-50780",
  "cveTags": [],
  "metrics": {
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "cvssData": {
          "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"
        },
        "impactScore": 5.9,
        "exploitabilityScore": 1.8
      }
    ]
  },
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "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"
            }
          ],
          "programFiles": [
            "net/core/net_namespace.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.33"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "2.6.33",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "4.19.264",
              "versionType": "semver",
              "lessThanOrEqual": "4.19.*"
            },
            {
              "status": "unaffected",
              "version": "5.4.223",
              "versionType": "semver",
              "lessThanOrEqual": "5.4.*"
            },
            {
              "status": "unaffected",
              "version": "5.10.153",
              "versionType": "semver",
              "lessThanOrEqual": "5.10.*"
            },
            {
              "status": "unaffected",
              "version": "5.15.77",
              "versionType": "semver",
              "lessThanOrEqual": "5.15.*"
            },
            {
              "status": "unaffected",
              "version": "6.0.7",
              "versionType": "semver",
              "lessThanOrEqual": "6.0.*"
            },
            {
              "status": "unaffected",
              "version": "6.1",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "net/core/net_namespace.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2025-12-24T13:16:04.843",
  "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"
    }
  ],
  "vulnStatus": "Deferred",
  "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<TASK>\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</TASK>\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"
    }
  ],
  "lastModified": "2026-08-04T10:18:24.063",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}