CVE-2022-50405
Estado: ModificadaMedia (5.5)—
In the Linux kernel, the following vulnerability has been resolved:
net/tunnel: wait until all sk_user_data reader finish before releasing the sock
There is a race condition in vxlan that when deleting a vxlan device during receiving packets, there is a possibility that the sock is released after getting vxlan_sock vs from sk_user_data. Then in later vxlan_ecn_decapsulate(), vxlan_get_sk_family() we will got NULL pointer dereference. e.g.
Reproducer: https://github.com/Mellanox/ovs-tests/blob/master/test-ovs-vxlan-remove-tunnel-during-traffic.sh
Fix this by waiting for all sk_user_data reader to finish before releasing the sock.
Detalles técnicos trazas, registros y código del informe original
#0 [ffffa25ec6978a38] machine_kexec at ffffffff8c669757
#1 [ffffa25ec6978a90] __crash_kexec at ffffffff8c7c0a4d
#2 [ffffa25ec6978b58] crash_kexec at ffffffff8c7c1c48
#3 [ffffa25ec6978b60] oops_end at ffffffff8c627f2b
#4 [ffffa25ec6978b80] page_fault_oops at ffffffff8c678fcb
#5 [ffffa25ec6978bd8] exc_page_fault at ffffffff8d109542
#6 [ffffa25ec6978c00] asm_exc_page_fault at ffffffff8d200b62
[exception RIP: vxlan_ecn_decapsulate+0x3b]
RIP: ffffffffc1014e7b RSP: ffffa25ec6978cb0 RFLAGS: 00010246
RAX: 0000000000000008 RBX: ffff8aa000888000 RCX: 0000000000000000
RDX: 000000000000000e RSI: ffff8a9fc7ab803e RDI: ffff8a9fd1168700
RBP: ffff8a9fc7ab803e R8: 0000000000700000 R9: 00000000000010ae
R10: ffff8a9fcb748980 R11: 0000000000000000 R12: ffff8a9fd1168700
R13: ffff8aa000888000 R14: 00000000002a0000 R15: 00000000000010ae
ORIG_RAX: ffffffffffffffff CS: 0010 SS: 0018
#7 [ffffa25ec6978ce8] vxlan_rcv at ffffffffc10189cd [vxlan]
#8 [ffffa25ec6978d90] udp_queue_rcv_one_skb at ffffffff8cfb6507
#9 [ffffa25ec6978dc0] udp_unicast_rcv_skb at ffffffff8cfb6e45
#10 [ffffa25ec6978dc8] __udp4_lib_rcv at ffffffff8cfb8807
#11 [ffffa25ec6978e20] ip_protocol_deliver_rcu at ffffffff8cf76951
#12 [ffffa25ec6978e48] ip_local_deliver at ffffffff8cf76bde
#13 [ffffa25ec6978ea0] __netif_receive_skb_one_core at ffffffff8cecde9b
#14 [ffffa25ec6978ec8] process_backlog at ffffffff8cece139
#15 [ffffa25ec6978f00] __napi_poll at ffffffff8ceced1a
#16 [ffffa25ec6978f28] net_rx_action at ffffffff8cecf1f3
#17 [ffffa25ec6978fa0] __softirqentry_text_start at ffffffff8d4000ca
#18 [ffffa25ec6978ff0] do_softirq at ffffffff8c6fbdc3CVSS
- Versión: 3.1
- Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- Puntuación base: 5.5
Probabilidad de explotación (EPSS)
- Probabilidad de explotación en los próximos 30 días: 0.17%
- Percentil entre todas las CVEs puntuadas: 6
- Fecha de la puntuación: 5/10/2026
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).
Tecnologías afectadas (1)
CWE
- CWE-476
- CWE-476
Referencias
- https://git.kernel.org/stable/c/303000c793f705d07b551eb7c1c27001c5b33c8d
- https://git.kernel.org/stable/c/3cf7203ca620682165706f70a1b12b5194607dce
- https://git.kernel.org/stable/c/588d0b8462f5ffed3e677e65639825b2678117ab
- https://git.kernel.org/stable/c/84e566d157cc22ad2da8bdd970495855fbf13d92
- https://git.kernel.org/stable/c/91f09a776ae335ca836ed864b8f2a9461882a280
- https://git.kernel.org/stable/c/9a6544343bba7da929d6d4a2dc44ec0f15970081
- https://git.kernel.org/stable/c/b38aa7465411795e9e744b8d94633910497fec2a
- https://git.kernel.org/stable/c/be34e79e0ae6adbf6e7e75ddaee9ad84795ab933
- https://git.kernel.org/stable/c/e8316584b0a6c61c9c407631040c22712b26e38c
JSON original (NVD)
Mostrar
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"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/tunnel: wait until all sk_user_data reader finish before releasing the sock\n\nThere is a race condition in vxlan that when deleting a vxlan device\nduring receiving packets, there is a possibility that the sock is\nreleased after getting vxlan_sock vs from sk_user_data. Then in\nlater vxlan_ecn_decapsulate(), vxlan_get_sk_family() we will got\nNULL pointer dereference. e.g.\n\n #0 [ffffa25ec6978a38] machine_kexec at ffffffff8c669757\n #1 [ffffa25ec6978a90] __crash_kexec at ffffffff8c7c0a4d\n #2 [ffffa25ec6978b58] crash_kexec at ffffffff8c7c1c48\n #3 [ffffa25ec6978b60] oops_end at ffffffff8c627f2b\n #4 [ffffa25ec6978b80] page_fault_oops at ffffffff8c678fcb\n #5 [ffffa25ec6978bd8] exc_page_fault at ffffffff8d109542\n #6 [ffffa25ec6978c00] asm_exc_page_fault at ffffffff8d200b62\n [exception RIP: vxlan_ecn_decapsulate+0x3b]\n RIP: ffffffffc1014e7b RSP: ffffa25ec6978cb0 RFLAGS: 00010246\n RAX: 0000000000000008 RBX: ffff8aa000888000 RCX: 0000000000000000\n RDX: 000000000000000e RSI: ffff8a9fc7ab803e RDI: ffff8a9fd1168700\n RBP: ffff8a9fc7ab803e R8: 0000000000700000 R9: 00000000000010ae\n R10: ffff8a9fcb748980 R11: 0000000000000000 R12: ffff8a9fd1168700\n R13: ffff8aa000888000 R14: 00000000002a0000 R15: 00000000000010ae\n ORIG_RAX: ffffffffffffffff CS: 0010 SS: 0018\n #7 [ffffa25ec6978ce8] vxlan_rcv at ffffffffc10189cd [vxlan]\n #8 [ffffa25ec6978d90] udp_queue_rcv_one_skb at ffffffff8cfb6507\n #9 [ffffa25ec6978dc0] udp_unicast_rcv_skb at ffffffff8cfb6e45\n #10 [ffffa25ec6978dc8] __udp4_lib_rcv at ffffffff8cfb8807\n #11 [ffffa25ec6978e20] ip_protocol_deliver_rcu at ffffffff8cf76951\n #12 [ffffa25ec6978e48] ip_local_deliver at ffffffff8cf76bde\n #13 [ffffa25ec6978ea0] __netif_receive_skb_one_core at ffffffff8cecde9b\n #14 [ffffa25ec6978ec8] process_backlog at ffffffff8cece139\n #15 [ffffa25ec6978f00] __napi_poll at ffffffff8ceced1a\n #16 [ffffa25ec6978f28] net_rx_action at ffffffff8cecf1f3\n #17 [ffffa25ec6978fa0] __softirqentry_text_start at ffffffff8d4000ca\n #18 [ffffa25ec6978ff0] do_softirq at ffffffff8c6fbdc3\n\nReproducer: https://github.com/Mellanox/ovs-tests/blob/master/test-ovs-vxlan-remove-tunnel-during-traffic.sh\n\nFix this by waiting for all sk_user_data reader to finish before\nreleasing the sock."
}
],
"lastModified": "2026-08-04T10:18:14.967",
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