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CVE-2024-53168

Estado: ModificadaAlta (7.8)—

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

sunrpc: fix one UAF issue caused by sunrpc kernel tcp socket

Reproduction script:

mkdir -p /mnt/nfsshare mkdir -p /mnt/nfs/netns_1 mkfs.ext4 /dev/sdb mount /dev/sdb /mnt/nfsshare systemctl restart nfs-server chmod 777 /mnt/nfsshare exportfs -i -o rw,no_root_squash *:/mnt/nfsshare

ip netns add netns_1 ip link add name veth_1_peer type veth peer veth_1 ifconfig veth_1_peer 11.11.0.254 up ip link set veth_1 netns netns_1 ip netns exec netns_1 ifconfig veth_1 11.11.0.1

(note: In my environment, a DESTROY_CLIENTID operation is always sent immediately, breaking the nfs tcp connection.) ip netns exec netns_1 timeout -s 9 300 mount -t nfs -o proto=tcp,vers=4.1 \ 11.11.0.254:/mnt/nfsshare /mnt/nfs/netns_1

Leer descripción completaMostrar menos

ip netns del netns_1

The reason here is that the tcp socket in netns_1 (nfs side) has been shutdown and closed (done in xs_destroy), but the FIN message (with ack) is discarded, and the nfsd side keeps sending retransmission messages. As a result, when the tcp sock in netns_1 processes the received message, it sends the message (FIN message) in the sending queue, and the tcp timer is re-established. When the network namespace is deleted, the net structure accessed by tcp's timer handler function causes problems.

To fix this problem, let's hold netns refcnt for the tcp kernel socket as done in other modules. This is an ugly hack which can easily be backported to earlier kernels. A proper fix which cleans up the interfaces will follow, but may not be so easy to backport.

Detalles técnicos trazas, registros y código del informe original
BUG: KASAN: slab-use-after-free in tcp_write_timer_handler+0x156/0x3e0
Read of size 1 at addr ffff888111f322cd by task swapper/0/0

CPU: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainted 6.12.0-rc4-dirty #7
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1
Call Trace:
 <IRQ>
 dump_stack_lvl+0x68/0xa0
 print_address_description.constprop.0+0x2c/0x3d0
 print_report+0xb4/0x270
 kasan_report+0xbd/0xf0
 tcp_write_timer_handler+0x156/0x3e0
 tcp_write_timer+0x66/0x170
 call_timer_fn+0xfb/0x1d0
 __run_timers+0x3f8/0x480
 run_timer_softirq+0x9b/0x100
 handle_softirqs+0x153/0x390
 __irq_exit_rcu+0x103/0x120
 irq_exit_rcu+0xe/0x20
 sysvec_apic_timer_interrupt+0x76/0x90
 </IRQ>
 <TASK>
 asm_sysvec_apic_timer_interrupt+0x1a/0x20
RIP: 0010:default_idle+0xf/0x20
Code: 4c 01 c7 4c 29 c2 e9 72 ff ff ff 90 90 90 90 90 90 90 90 90 90 90 90
 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d 33 f8 25 00 fb f4 <fa> c3 cc cc cc
 cc 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90
RSP: 0018:ffffffffa2007e28 EFLAGS: 00000242
RAX: 00000000000f3b31 RBX: 1ffffffff4400fc7 RCX: ffffffffa09c3196
RDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff9f00590f
RBP: 0000000000000000 R08: 0000000000000001 R09: ffffed102360835d
R10: ffff88811b041aeb R11: 0000000000000001 R12: 0000000000000000
R13: ffffffffa202d7c0 R14: 0000000000000000 R15: 00000000000147d0
 default_idle_call+0x6b/0xa0
 cpuidle_idle_call+0x1af/0x1f0
 do_idle+0xbc/0x130
 cpu_startup_entry+0x33/0x40
 rest_init+0x11f/0x210
 start_kernel+0x39a/0x420
 x86_64_start_reservations+0x18/0x30
 x86_64_start_kernel+0x97/0xa0
 common_startup_64+0x13e/0x141
 </TASK>

Allocated by task 595:
 kasan_save_stack+0x24/0x50
 kasan_save_track+0x14/0x30
 __kasan_slab_alloc+0x87/0x90
 kmem_cache_alloc_noprof+0x12b/0x3f0
 copy_net_ns+0x94/0x380
 create_new_namespaces+0x24c/0x500
 unshare_nsproxy_namespaces+0x75/0xf0
 ksys_unshare+0x24e/0x4f0
 __x64_sys_unshare+0x1f/0x30
 do_syscall_64+0x70/0x180
 entry_SYSCALL_64_after_hwframe+0x76/0x7e

Freed by task 100:
 kasan_save_stack+0x24/0x50
 kasan_save_track+0x14/0x30
 kasan_save_free_info+0x3b/0x60
 __kasan_slab_free+0x54/0x70
 kmem_cache_free+0x156/0x5d0
 cleanup_net+0x5d3/0x670
 process_one_work+0x776/0xa90
 worker_thread+0x2e2/0x560
 kthread+0x1a8/0x1f0
 ret_from_fork+0x34/0x60
 ret_from_fork_asm+0x1a/0x30

ip netns exec netns_1 /root/iptables -A OUTPUT -d 11.11.0.254 -p tcp \
	--tcp-flags FIN FIN  -j DROP

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.

UAF en kernel de Linux (CWE-416) con acceso local (AV:L/PR:L) permite DoS mediante manipulación de timers TCP en namespaces. Requiere privilegios locales para trigger (unshare syscall).

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)

Linux — Linux Kernel

CWE

Referencias

JSON original (NVD)

Mostrar
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  "id": "CVE-2024-53168",
  "cveTags": [],
  "metrics": {
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        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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              "versionType": "git"
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            {
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          "programFiles": [
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            "net/sunrpc/xprtsock.c"
          ],
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        {
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              "version": "4.2"
            },
            {
              "status": "unaffected",
              "version": "0",
              "lessThan": "4.2",
              "versionType": "semver"
            },
            {
              "status": "unaffected",
              "version": "6.6.64",
              "versionType": "semver",
              "lessThanOrEqual": "6.6.*"
            },
            {
              "status": "unaffected",
              "version": "6.11.11",
              "versionType": "semver",
              "lessThanOrEqual": "6.11.*"
            },
            {
              "status": "unaffected",
              "version": "6.12.2",
              "versionType": "semver",
              "lessThanOrEqual": "6.12.*"
            },
            {
              "status": "unaffected",
              "version": "6.13",
              "versionType": "original_commit_for_fix",
              "lessThanOrEqual": "*"
            }
          ],
          "programFiles": [
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            "net/sunrpc/xprtsock.c"
          ],
          "defaultStatus": "affected"
        }
      ]
    }
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  "published": "2024-12-27T14:15:23.940",
  "references": [
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      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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    {
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      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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    {
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      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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    {
      "url": "https://git.kernel.org/stable/c/694ccb05b79ee5f5a9f14c2f80d2635d3bb8bdc3",
      "tags": [
        "Patch"
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-416"
        }
      ]
    },
    {
      "type": "Secondary",
      "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
      "description": [
        {
          "lang": "en",
          "value": "CWE-416"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsunrpc: fix one UAF issue caused by sunrpc kernel tcp socket\n\nBUG: KASAN: slab-use-after-free in tcp_write_timer_handler+0x156/0x3e0\nRead of size 1 at addr ffff888111f322cd by task swapper/0/0\n\nCPU: 0 UID: 0 PID: 0 Comm: swapper/0 Not tainted 6.12.0-rc4-dirty #7\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1\nCall Trace:\n <IRQ>\n dump_stack_lvl+0x68/0xa0\n print_address_description.constprop.0+0x2c/0x3d0\n print_report+0xb4/0x270\n kasan_report+0xbd/0xf0\n tcp_write_timer_handler+0x156/0x3e0\n tcp_write_timer+0x66/0x170\n call_timer_fn+0xfb/0x1d0\n __run_timers+0x3f8/0x480\n run_timer_softirq+0x9b/0x100\n handle_softirqs+0x153/0x390\n __irq_exit_rcu+0x103/0x120\n irq_exit_rcu+0xe/0x20\n sysvec_apic_timer_interrupt+0x76/0x90\n </IRQ>\n <TASK>\n asm_sysvec_apic_timer_interrupt+0x1a/0x20\nRIP: 0010:default_idle+0xf/0x20\nCode: 4c 01 c7 4c 29 c2 e9 72 ff ff ff 90 90 90 90 90 90 90 90 90 90 90 90\n 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d 33 f8 25 00 fb f4 <fa> c3 cc cc cc\n cc 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90\nRSP: 0018:ffffffffa2007e28 EFLAGS: 00000242\nRAX: 00000000000f3b31 RBX: 1ffffffff4400fc7 RCX: ffffffffa09c3196\nRDX: 0000000000000000 RSI: 0000000000000000 RDI: ffffffff9f00590f\nRBP: 0000000000000000 R08: 0000000000000001 R09: ffffed102360835d\nR10: ffff88811b041aeb R11: 0000000000000001 R12: 0000000000000000\nR13: ffffffffa202d7c0 R14: 0000000000000000 R15: 00000000000147d0\n default_idle_call+0x6b/0xa0\n cpuidle_idle_call+0x1af/0x1f0\n do_idle+0xbc/0x130\n cpu_startup_entry+0x33/0x40\n rest_init+0x11f/0x210\n start_kernel+0x39a/0x420\n x86_64_start_reservations+0x18/0x30\n x86_64_start_kernel+0x97/0xa0\n common_startup_64+0x13e/0x141\n </TASK>\n\nAllocated by task 595:\n kasan_save_stack+0x24/0x50\n kasan_save_track+0x14/0x30\n __kasan_slab_alloc+0x87/0x90\n kmem_cache_alloc_noprof+0x12b/0x3f0\n copy_net_ns+0x94/0x380\n create_new_namespaces+0x24c/0x500\n unshare_nsproxy_namespaces+0x75/0xf0\n ksys_unshare+0x24e/0x4f0\n __x64_sys_unshare+0x1f/0x30\n do_syscall_64+0x70/0x180\n entry_SYSCALL_64_after_hwframe+0x76/0x7e\n\nFreed by task 100:\n kasan_save_stack+0x24/0x50\n kasan_save_track+0x14/0x30\n kasan_save_free_info+0x3b/0x60\n __kasan_slab_free+0x54/0x70\n kmem_cache_free+0x156/0x5d0\n cleanup_net+0x5d3/0x670\n process_one_work+0x776/0xa90\n worker_thread+0x2e2/0x560\n kthread+0x1a8/0x1f0\n ret_from_fork+0x34/0x60\n ret_from_fork_asm+0x1a/0x30\n\nReproduction script:\n\nmkdir -p /mnt/nfsshare\nmkdir -p /mnt/nfs/netns_1\nmkfs.ext4 /dev/sdb\nmount /dev/sdb /mnt/nfsshare\nsystemctl restart nfs-server\nchmod 777 /mnt/nfsshare\nexportfs -i -o rw,no_root_squash *:/mnt/nfsshare\n\nip netns add netns_1\nip link add name veth_1_peer type veth peer veth_1\nifconfig veth_1_peer 11.11.0.254 up\nip link set veth_1 netns netns_1\nip netns exec netns_1 ifconfig veth_1 11.11.0.1\n\nip netns exec netns_1 /root/iptables -A OUTPUT -d 11.11.0.254 -p tcp \\\n\t--tcp-flags FIN FIN  -j DROP\n\n(note: In my environment, a DESTROY_CLIENTID operation is always sent\n immediately, breaking the nfs tcp connection.)\nip netns exec netns_1 timeout -s 9 300 mount -t nfs -o proto=tcp,vers=4.1 \\\n\t11.11.0.254:/mnt/nfsshare /mnt/nfs/netns_1\n\nip netns del netns_1\n\nThe reason here is that the tcp socket in netns_1 (nfs side) has been\nshutdown and closed (done in xs_destroy), but the FIN message (with ack)\nis discarded, and the nfsd side keeps sending retransmission messages.\nAs a result, when the tcp sock in netns_1 processes the received message,\nit sends the message (FIN message) in the sending queue, and the tcp timer\nis re-established. When the network namespace is deleted, the net structure\naccessed by tcp's timer handler function causes problems.\n\nTo fix this problem, let's hold netns refcnt for the tcp kernel socket as\ndone in other modules. This is an ugly hack which can easily be backported\nto earlier kernels. A proper fix which cleans up the interfaces will\nfollow, but may not be so easy to backport."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: sunrpc: se corrige un problema de UAF causado por el socket TCP del kernel de sunrpc ERROR: KASAN: slab-use-after-free en tcp_write_timer_handler+0x156/0x3e0 Lectura de tamaño 1 en la dirección ffff888111f322cd por la tarea swapper/0/0 CPU: 0 UID: 0 PID: 0 Comm: swapper/0 No contaminado 6.12.0-rc4-dirty #7 Nombre del hardware: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 Rastreo de llamadas:  dump_stack_lvl+0x68/0xa0 print_address_description.constprop.0+0x2c/0x3d0 print_report+0xb4/0x270  asm_sysvec_apic_timer_interrupt+0x1a/0x20 DESCARGA: 0010:default_idle+0xf/0x20 Código: 4c 01 c7 4c 29 c2 e9 72 ff ff ff 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 66 90 0f 00 2d 33 f8 25 00 fb f4  c3 cc cc cc cc 66 66 2e 0f 1f 84 00 00 00 00 00 90 90 90 90 90 RSP: 0018:ffffffffa2007e28 EFLAGS: 00000242 RAX: 00000000000f3b31 RBX: 1ffffffff4400fc7 RCX: ffffffffa09c3196 RDX: 0000000000000000 RSI: 00000000000000000 RDI: ffffffff9f00590f RBP: 0000000000000000 R08: 00000000000000001 R09: ffffed102360835d R10: ffff88811b041aeb R11: 00000000000000001 R12: 00000000000000000 R13: fffffffa202d7c0 R14: 0000000000000000 R15: 00000000000147d0 llamada_inactiva_predeterminada+0x6b/0xa0 llamada_inactiva_cpuidle+0x1af/0x1f0 inactividad_real+0xbc/0x130 entrada_inicio_cpu+0x33/0x40 inicio_resto+0x11f/0x210 núcleo_inicio+0x39a/0x420 reserva_inicio_x86_64+0x18/0x30 núcleo_inicio_x86_64+0x97/0xa0 inicio_común_64+0x13e/0x141  Asignado por la tarea 595: pila_guardado_kasan+0x24/0x50 seguimiento_guardado_kasan+0x14/0x30 __kasan_slab_alloc+0x87/0x90 kmem_cache_alloc_noprof+0x12b/0x3f0 copy_net_ns+0x94/0x380 create_new_namespaces+0x24c/0x500 unshare_nsproxy_namespaces+0x75/0xf0 ksys_unshare+0x24e/0x4f0 __x64_sys_unshare+0x1f/0x30 do_syscall_64+0x70/0x180 entry_SYSCALL_64_after_hwframe+0x76/0x7e Liberado por la tarea 100: kasan_save_stack+0x24/0x50 kasan_save_track+0x14/0x30 kasan_save_free_info+0x3b/0x60 __kasan_slab_free+0x54/0x70 kmem_cache_free+0x156/0x5d0 cleanup_net+0x5d3/0x670 process_one_work+0x776/0xa90 worker_thread+0x2e2/0x560 kthread+0x1a8/0x1f0 ret_from_fork+0x34/0x60 ret_from_fork_asm+0x1a/0x30 Script de reproducción: mkdir -p /mnt/nfsshare mkdir -p /mnt/nfs/netns_1 mkfs.ext4 /dev/sdb mount /dev/sdb /mnt/nfsshare systemctl restart nfs-server chmod 777 /mnt/nfsshare exportfs -i -o rw,no_root_squash *:/mnt/nfsshare ip netns add netns_1 ip link add name veth_1_peer type veth peer veth_1 ifconfig veth_1_peer 11.11.0.254 up ip link set veth_1 netns netns_1 ip netns exec netns_1 ifconfig veth_1 11.11.0.1 ip netns exec netns_1 /root/iptables -A OUTPUT -d 11.11.0.254 -p tcp \\ --tcp-flags FIN FIN -j DROP (nota: En mi entorno, una operación DESTROY_CLIENTID siempre se envía inmediatamente, interrumpiendo la conexión tcp de nfs). ip netns exec netns_1 timeout -s 9 300 mount -t nfs -o proto=tcp,vers=4.1 \\ 11.11.0.254:/mnt/nfsshare /mnt/nfs/netns_1 ip netns del netns_1 La razón aquí es que el socket tcp en netns_1 (lado nfs) se ha apagado y cerrado (hecho en xs_destroy), pero el mensaje FIN (con ack) se descarta y el lado nfsd sigue enviando mensajes de retransmisión. Como resultado, cuando el sock tcp en netns_1 procesa el mensaje recibido, envía el mensaje (mensaje FIN) en la cola de envío y se restablece el temporizador tcp. Cuando se elimina el espacio de nombres de red, la estructura de red a la que accede la función del controlador del temporizador de tcp causa problemas. Para solucionar este problema, mantengamos netns refcnt para el socket de kernel tcp como se hizo en otros módulos. Este es un truco feo que se puede adaptar fácilmente a kernels anteriores. Seguiremos con una solución adecuada que limpie las interfaces, pero puede que no sea tan fácil adaptarla."
    }
  ],
  "lastModified": "2026-06-17T08:08:28.417",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "6994348B-078A-437B-8D69-656CEF4BA55E",
              "versionEndExcluding": "6.6.64",
              "versionStartIncluding": "4.2"
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "vulnerable": true,
              "matchCriteriaId": "21434379-192D-472F-9B54-D45E3650E893",
              "versionEndExcluding": "6.11.11",
              "versionStartIncluding": "6.7"
            },
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}