CVE-2026-43164

Estado: AnalizadaAlta (7.5)—

In the Linux kernel, the following vulnerability has been resolved:

udplite: Fix null-ptr-deref in __udp_enqueue_schedule_skb().

syzbot reported null-ptr-deref of udp_sk(sk)->udp_prod_queue. [0]

Since the cited commit, udp_lib_init_sock() can fail, as can udp_init_sock() and udpv6_init_sock().

Let's handle the error in udplite_sk_init() and udplitev6_sk_init().

Detalles técnicos trazas, registros y código del informe original

[0]:
BUG: KASAN: null-ptr-deref in instrument_atomic_read include/linux/instrumented.h:82 [inline]
BUG: KASAN: null-ptr-deref in atomic_read include/linux/atomic/atomic-instrumented.h:32 [inline]
BUG: KASAN: null-ptr-deref in __udp_enqueue_schedule_skb+0x151/0x1480 net/ipv4/udp.c:1719
Read of size 4 at addr 0000000000000008 by task syz.2.18/2944

CPU: 1 UID: 0 PID: 2944 Comm: syz.2.18 Not tainted syzkaller #0 PREEMPTLAZY
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025
Call Trace:
 <IRQ>
 dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120
 kasan_report+0xa2/0xe0 mm/kasan/report.c:595
 check_region_inline mm/kasan/generic.c:-1 [inline]
 kasan_check_range+0x264/0x2c0 mm/kasan/generic.c:200
 instrument_atomic_read include/linux/instrumented.h:82 [inline]
 atomic_read include/linux/atomic/atomic-instrumented.h:32 [inline]
 __udp_enqueue_schedule_skb+0x151/0x1480 net/ipv4/udp.c:1719
 __udpv6_queue_rcv_skb net/ipv6/udp.c:795 [inline]
 udpv6_queue_rcv_one_skb+0xa2e/0x1ad0 net/ipv6/udp.c:906
 udp6_unicast_rcv_skb+0x227/0x380 net/ipv6/udp.c:1064
 ip6_protocol_deliver_rcu+0xe17/0x1540 net/ipv6/ip6_input.c:438
 ip6_input_finish+0x191/0x350 net/ipv6/ip6_input.c:489
 NF_HOOK+0x354/0x3f0 include/linux/netfilter.h:318
 ip6_input+0x16c/0x2b0 net/ipv6/ip6_input.c:500
 NF_HOOK+0x354/0x3f0 include/linux/netfilter.h:318
 __netif_receive_skb_one_core net/core/dev.c:6149 [inline]
 __netif_receive_skb+0xd3/0x370 net/core/dev.c:6262
 process_backlog+0x4d6/0x1160 net/core/dev.c:6614
 __napi_poll+0xae/0x320 net/core/dev.c:7678
 napi_poll net/core/dev.c:7741 [inline]
 net_rx_action+0x60d/0xdc0 net/core/dev.c:7893
 handle_softirqs+0x209/0x8d0 kernel/softirq.c:622
 do_softirq+0x52/0x90 kernel/softirq.c:523
 </IRQ>
 <TASK>
 __local_bh_enable_ip+0xe7/0x120 kernel/softirq.c:450
 local_bh_enable include/linux/bottom_half.h:33 [inline]
 rcu_read_unlock_bh include/linux/rcupdate.h:924 [inline]
 __dev_queue_xmit+0x109c/0x2dc0 net/core/dev.c:4856
 __ip6_finish_output net/ipv6/ip6_output.c:-1 [inline]
 ip6_finish_output+0x158/0x4e0 net/ipv6/ip6_output.c:219
 NF_HOOK_COND include/linux/netfilter.h:307 [inline]
 ip6_output+0x342/0x580 net/ipv6/ip6_output.c:246
 ip6_send_skb+0x1d7/0x3c0 net/ipv6/ip6_output.c:1984
 udp_v6_send_skb+0x9a5/0x1770 net/ipv6/udp.c:1442
 udp_v6_push_pending_frames+0xa2/0x140 net/ipv6/udp.c:1469
 udpv6_sendmsg+0xfe0/0x2830 net/ipv6/udp.c:1759
 sock_sendmsg_nosec net/socket.c:727 [inline]
 __sock_sendmsg+0xe5/0x270 net/socket.c:742
 __sys_sendto+0x3eb/0x580 net/socket.c:2206
 __do_sys_sendto net/socket.c:2213 [inline]
 __se_sys_sendto net/socket.c:2209 [inline]
 __x64_sys_sendto+0xde/0x100 net/socket.c:2209
 do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]
 do_syscall_64+0xd2/0xf20 arch/x86/entry/syscall_64.c:94
 entry_SYSCALL_64_after_hwframe+0x76/0x7e
RIP: 0033:0x7f67b4d9c629
Code: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48
RSP: 002b:00007f67b5c98028 EFLAGS: 00000246 ORIG_RAX: 000000000000002c
RAX: ffffffffffffffda RBX: 00007f67b5015fa0 RCX: 00007f67b4d9c629
RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003
RBP: 00007f67b4e32b39 R08: 0000000000000000 R09: 0000000000000000
R10: 0000000000040000 R11: 0000000000000246 R12: 0000000000000000
R13: 00007f67b5016038 R14: 00007f67b5015fa0 R15: 00007ffe3cb66dd8
 </TASK>

CVSS

Versión: 3.1
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Puntuación base: 7.5

Probabilidad de explotación (EPSS)

Probabilidad de explotación en los próximos 30 días: 0.61%
Percentil entre todas las CVEs puntuadas: 47
Fecha de la puntuación: 6/10/2026

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.

ExplotaciónT1190 Exploit Public-Facing Applicationinitial access25 %
Impacto principalT1499.004 Application or System Exploitationimpact75 %

Vulnerability de null-ptr-deref en kernel Linux (CWE-476) accesible remotamente vía UDP/IPv6. Vector CVSS AV:N sin autenticación permite DoS local de recursos de red; no expone datos ni requiere interacción.

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

Filter Network Traffic Vulnerability Scanning Privileged Account Management Network Segmentation Limit Access to Resource Over Network Application Isolation and Sandboxing

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

CWE-476

Referencias

JSON original (NVD)

Mostrar

{
  "id": "CVE-2026-43164",
  "cveTags": [],
  "metrics": {
    "cvssMetricV31": [
      {
        "type": "Secondary",
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 7.5,
          "attackVector": "NETWORK",
          "baseSeverity": "HIGH",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 3.9
      }
    ]
  },
  "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": "b650bf0977d34c52befb31a9fa711534e11b220f",
              "lessThan": "f27030ac5bef47d997cfac05a3d188aa69f4df7f",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "b650bf0977d34c52befb31a9fa711534e11b220f",
              "lessThan": "0f13fa087ead642ea1eb5fdb6eb092c913ef06b7",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "b650bf0977d34c52befb31a9fa711534e11b220f",
              "lessThan": "470c7ca2b4c3e3a51feeb952b7f97a775b5c49cd",
              "versionType": "git"
            }
          ],
          "programFiles": [
            "net/ipv4/udplite.c",
            "net/ipv6/udplite.c"
          ],
          "defaultStatus": "unaffected"
        },
        {
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "product": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.18"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "6.18",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "6.18.16",
              "versionType": "semver",
              "lessThanOrEqual": "6.18.*"
            },
            {
              "status": "unaffected",
              "version": "6.19.6",
              "versionType": "semver",
              "lessThanOrEqual": "6.19.*"
            },
            {
              "status": "unaffected",
              "version": "7.0",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
            "net/ipv4/udplite.c",
            "net/ipv6/udplite.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
  ],
  "published": "2026-05-06T12:16:34.540",
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/0f13fa087ead642ea1eb5fdb6eb092c913ef06b7",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/470c7ca2b4c3e3a51feeb952b7f97a775b5c49cd",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/f27030ac5bef47d997cfac05a3d188aa69f4df7f",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-476"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nudplite: Fix null-ptr-deref in __udp_enqueue_schedule_skb().\n\nsyzbot reported null-ptr-deref of udp_sk(sk)->udp_prod_queue. [0]\n\nSince the cited commit, udp_lib_init_sock() can fail, as can\nudp_init_sock() and udpv6_init_sock().\n\nLet's handle the error in udplite_sk_init() and udplitev6_sk_init().\n\n[0]:\nBUG: KASAN: null-ptr-deref in instrument_atomic_read include/linux/instrumented.h:82 [inline]\nBUG: KASAN: null-ptr-deref in atomic_read include/linux/atomic/atomic-instrumented.h:32 [inline]\nBUG: KASAN: null-ptr-deref in __udp_enqueue_schedule_skb+0x151/0x1480 net/ipv4/udp.c:1719\nRead of size 4 at addr 0000000000000008 by task syz.2.18/2944\n\nCPU: 1 UID: 0 PID: 2944 Comm: syz.2.18 Not tainted syzkaller #0 PREEMPTLAZY\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025\nCall Trace:\n <IRQ>\n dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120\n kasan_report+0xa2/0xe0 mm/kasan/report.c:595\n check_region_inline mm/kasan/generic.c:-1 [inline]\n kasan_check_range+0x264/0x2c0 mm/kasan/generic.c:200\n instrument_atomic_read include/linux/instrumented.h:82 [inline]\n atomic_read include/linux/atomic/atomic-instrumented.h:32 [inline]\n __udp_enqueue_schedule_skb+0x151/0x1480 net/ipv4/udp.c:1719\n __udpv6_queue_rcv_skb net/ipv6/udp.c:795 [inline]\n udpv6_queue_rcv_one_skb+0xa2e/0x1ad0 net/ipv6/udp.c:906\n udp6_unicast_rcv_skb+0x227/0x380 net/ipv6/udp.c:1064\n ip6_protocol_deliver_rcu+0xe17/0x1540 net/ipv6/ip6_input.c:438\n ip6_input_finish+0x191/0x350 net/ipv6/ip6_input.c:489\n NF_HOOK+0x354/0x3f0 include/linux/netfilter.h:318\n ip6_input+0x16c/0x2b0 net/ipv6/ip6_input.c:500\n NF_HOOK+0x354/0x3f0 include/linux/netfilter.h:318\n __netif_receive_skb_one_core net/core/dev.c:6149 [inline]\n __netif_receive_skb+0xd3/0x370 net/core/dev.c:6262\n process_backlog+0x4d6/0x1160 net/core/dev.c:6614\n __napi_poll+0xae/0x320 net/core/dev.c:7678\n napi_poll net/core/dev.c:7741 [inline]\n net_rx_action+0x60d/0xdc0 net/core/dev.c:7893\n handle_softirqs+0x209/0x8d0 kernel/softirq.c:622\n do_softirq+0x52/0x90 kernel/softirq.c:523\n </IRQ>\n <TASK>\n __local_bh_enable_ip+0xe7/0x120 kernel/softirq.c:450\n local_bh_enable include/linux/bottom_half.h:33 [inline]\n rcu_read_unlock_bh include/linux/rcupdate.h:924 [inline]\n __dev_queue_xmit+0x109c/0x2dc0 net/core/dev.c:4856\n __ip6_finish_output net/ipv6/ip6_output.c:-1 [inline]\n ip6_finish_output+0x158/0x4e0 net/ipv6/ip6_output.c:219\n NF_HOOK_COND include/linux/netfilter.h:307 [inline]\n ip6_output+0x342/0x580 net/ipv6/ip6_output.c:246\n ip6_send_skb+0x1d7/0x3c0 net/ipv6/ip6_output.c:1984\n udp_v6_send_skb+0x9a5/0x1770 net/ipv6/udp.c:1442\n udp_v6_push_pending_frames+0xa2/0x140 net/ipv6/udp.c:1469\n udpv6_sendmsg+0xfe0/0x2830 net/ipv6/udp.c:1759\n sock_sendmsg_nosec net/socket.c:727 [inline]\n __sock_sendmsg+0xe5/0x270 net/socket.c:742\n __sys_sendto+0x3eb/0x580 net/socket.c:2206\n __do_sys_sendto net/socket.c:2213 [inline]\n __se_sys_sendto net/socket.c:2209 [inline]\n __x64_sys_sendto+0xde/0x100 net/socket.c:2209\n do_syscall_x64 arch/x86/entry/syscall_64.c:63 [inline]\n do_syscall_64+0xd2/0xf20 arch/x86/entry/syscall_64.c:94\n entry_SYSCALL_64_after_hwframe+0x76/0x7e\nRIP: 0033:0x7f67b4d9c629\nCode: ff c3 66 2e 0f 1f 84 00 00 00 00 00 0f 1f 44 00 00 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 e8 ff ff ff f7 d8 64 89 01 48\nRSP: 002b:00007f67b5c98028 EFLAGS: 00000246 ORIG_RAX: 000000000000002c\nRAX: ffffffffffffffda RBX: 00007f67b5015fa0 RCX: 00007f67b4d9c629\nRDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003\nRBP: 00007f67b4e32b39 R08: 0000000000000000 R09: 0000000000000000\nR10: 0000000000040000 R11: 0000000000000246 R12: 0000000000000000\nR13: 00007f67b5016038 R14: 00007f67b5015fa0 R15: 00007ffe3cb66dd8\n </TASK>"
    }
  ],
  "lastModified": "2026-06-17T10:49:03.300",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "E0D300DB-AA68-4962-981D-EF9F5E97AACF",
              "versionEndExcluding": "6.18.16",
              "versionStartIncluding": "6.18"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "373EEEDA-FAA1-4FB4-B6ED-DB4DD99DBE67",
              "versionEndExcluding": "6.19.6",
              "versionStartIncluding": "6.19"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "F253B622-8837-4245-BCE5-A7BF8FC76A16"
            }
          ],
          "operator": "OR"
        }
      ]
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
}