CVE-2025-38622 (GCVE-0-2025-38622)

Vulnerability from cvelistv5 – Published: 2025-08-22 16:00 – Updated: 2025-11-03 17:40
VLAI?
Title
net: drop UFO packets in udp_rcv_segment()
Summary
In the Linux kernel, the following vulnerability has been resolved: net: drop UFO packets in udp_rcv_segment() When sending a packet with virtio_net_hdr to tun device, if the gso_type in virtio_net_hdr is SKB_GSO_UDP and the gso_size is less than udphdr size, below crash may happen. ------------[ cut here ]------------ kernel BUG at net/core/skbuff.c:4572! Oops: invalid opcode: 0000 [#1] SMP NOPTI CPU: 0 UID: 0 PID: 62 Comm: mytest Not tainted 6.16.0-rc7 #203 PREEMPT(voluntary) Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014 RIP: 0010:skb_pull_rcsum+0x8e/0xa0 Code: 00 00 5b c3 cc cc cc cc 8b 93 88 00 00 00 f7 da e8 37 44 38 00 f7 d8 89 83 88 00 00 00 48 8b 83 c8 00 00 00 5b c3 cc cc cc cc <0f> 0b 0f 0b 66 66 2e 0f 1f 84 00 000 RSP: 0018:ffffc900001fba38 EFLAGS: 00000297 RAX: 0000000000000004 RBX: ffff8880040c1000 RCX: ffffc900001fb948 RDX: ffff888003e6d700 RSI: 0000000000000008 RDI: ffff88800411a062 RBP: ffff8880040c1000 R08: 0000000000000000 R09: 0000000000000001 R10: ffff888003606c00 R11: 0000000000000001 R12: 0000000000000000 R13: ffff888004060900 R14: ffff888004050000 R15: ffff888004060900 FS: 000000002406d3c0(0000) GS:ffff888084a19000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020000040 CR3: 0000000004007000 CR4: 00000000000006f0 Call Trace: <TASK> udp_queue_rcv_one_skb+0x176/0x4b0 net/ipv4/udp.c:2445 udp_queue_rcv_skb+0x155/0x1f0 net/ipv4/udp.c:2475 udp_unicast_rcv_skb+0x71/0x90 net/ipv4/udp.c:2626 __udp4_lib_rcv+0x433/0xb00 net/ipv4/udp.c:2690 ip_protocol_deliver_rcu+0xa6/0x160 net/ipv4/ip_input.c:205 ip_local_deliver_finish+0x72/0x90 net/ipv4/ip_input.c:233 ip_sublist_rcv_finish+0x5f/0x70 net/ipv4/ip_input.c:579 ip_sublist_rcv+0x122/0x1b0 net/ipv4/ip_input.c:636 ip_list_rcv+0xf7/0x130 net/ipv4/ip_input.c:670 __netif_receive_skb_list_core+0x21d/0x240 net/core/dev.c:6067 netif_receive_skb_list_internal+0x186/0x2b0 net/core/dev.c:6210 napi_complete_done+0x78/0x180 net/core/dev.c:6580 tun_get_user+0xa63/0x1120 drivers/net/tun.c:1909 tun_chr_write_iter+0x65/0xb0 drivers/net/tun.c:1984 vfs_write+0x300/0x420 fs/read_write.c:593 ksys_write+0x60/0xd0 fs/read_write.c:686 do_syscall_64+0x50/0x1c0 arch/x86/entry/syscall_64.c:63 </TASK> To trigger gso segment in udp_queue_rcv_skb(), we should also set option UDP_ENCAP_ESPINUDP to enable udp_sk(sk)->encap_rcv. When the encap_rcv hook return 1 in udp_queue_rcv_one_skb(), udp_csum_pull_header() will try to pull udphdr, but the skb size has been segmented to gso size, which leads to this crash. Previous commit cf329aa42b66 ("udp: cope with UDP GRO packet misdirection") introduces segmentation in UDP receive path only for GRO, which was never intended to be used for UFO, so drop UFO packets in udp_rcv_segment().
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: cf329aa42b6659204fee865bbce0ea20462552eb , < 72f97d3cb791e26492236b2be7fd70d2c6222555 (git)
Affected: cf329aa42b6659204fee865bbce0ea20462552eb , < df6ad849d59256dcc0e2234844ef9f0daf885f5c (git)
Affected: cf329aa42b6659204fee865bbce0ea20462552eb , < 4c1022220b1b6fea802175e80444923a3bbf93a5 (git)
Affected: cf329aa42b6659204fee865bbce0ea20462552eb , < 791f32c5eab33ca3a153f8f6f763aa0df1ddc320 (git)
Affected: cf329aa42b6659204fee865bbce0ea20462552eb , < 0d45954034f8edd6d4052e0190d3d6335c37e4de (git)
Affected: cf329aa42b6659204fee865bbce0ea20462552eb , < c0ec2e47f1e92d69b42b17a4a1e543256778393e (git)
Affected: cf329aa42b6659204fee865bbce0ea20462552eb , < fc45b3f9599b657d4a64bcf423d2a977b3e13a49 (git)
Affected: cf329aa42b6659204fee865bbce0ea20462552eb , < 0c639c6479ec4480372901a5fc566f7588cf5522 (git)
Affected: cf329aa42b6659204fee865bbce0ea20462552eb , < d46e51f1c78b9ab9323610feb14238d06d46d519 (git)
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    Linux Linux Affected: 5.0
Unaffected: 0 , < 5.0 (semver)
Unaffected: 5.4.297 , ≤ 5.4.* (semver)
Unaffected: 5.10.241 , ≤ 5.10.* (semver)
Unaffected: 5.15.190 , ≤ 5.15.* (semver)
Unaffected: 6.1.148 , ≤ 6.1.* (semver)
Unaffected: 6.6.102 , ≤ 6.6.* (semver)
Unaffected: 6.12.42 , ≤ 6.12.* (semver)
Unaffected: 6.15.10 , ≤ 6.15.* (semver)
Unaffected: 6.16.1 , ≤ 6.16.* (semver)
Unaffected: 6.17 , ≤ * (original_commit_for_fix)
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      "descriptions": [
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: drop UFO packets in udp_rcv_segment()\n\nWhen sending a packet with virtio_net_hdr to tun device, if the gso_type\nin virtio_net_hdr is SKB_GSO_UDP and the gso_size is less than udphdr\nsize, below crash may happen.\n\n  ------------[ cut here ]------------\n  kernel BUG at net/core/skbuff.c:4572!\n  Oops: invalid opcode: 0000 [#1] SMP NOPTI\n  CPU: 0 UID: 0 PID: 62 Comm: mytest Not tainted 6.16.0-rc7 #203 PREEMPT(voluntary)\n  Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014\n  RIP: 0010:skb_pull_rcsum+0x8e/0xa0\n  Code: 00 00 5b c3 cc cc cc cc 8b 93 88 00 00 00 f7 da e8 37 44 38 00 f7 d8 89 83 88 00 00 00 48 8b 83 c8 00 00 00 5b c3 cc cc cc cc \u003c0f\u003e 0b 0f 0b 66 66 2e 0f 1f 84 00 000\n  RSP: 0018:ffffc900001fba38 EFLAGS: 00000297\n  RAX: 0000000000000004 RBX: ffff8880040c1000 RCX: ffffc900001fb948\n  RDX: ffff888003e6d700 RSI: 0000000000000008 RDI: ffff88800411a062\n  RBP: ffff8880040c1000 R08: 0000000000000000 R09: 0000000000000001\n  R10: ffff888003606c00 R11: 0000000000000001 R12: 0000000000000000\n  R13: ffff888004060900 R14: ffff888004050000 R15: ffff888004060900\n  FS:  000000002406d3c0(0000) GS:ffff888084a19000(0000) knlGS:0000000000000000\n  CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n  CR2: 0000000020000040 CR3: 0000000004007000 CR4: 00000000000006f0\n  Call Trace:\n   \u003cTASK\u003e\n   udp_queue_rcv_one_skb+0x176/0x4b0 net/ipv4/udp.c:2445\n   udp_queue_rcv_skb+0x155/0x1f0 net/ipv4/udp.c:2475\n   udp_unicast_rcv_skb+0x71/0x90 net/ipv4/udp.c:2626\n   __udp4_lib_rcv+0x433/0xb00 net/ipv4/udp.c:2690\n   ip_protocol_deliver_rcu+0xa6/0x160 net/ipv4/ip_input.c:205\n   ip_local_deliver_finish+0x72/0x90 net/ipv4/ip_input.c:233\n   ip_sublist_rcv_finish+0x5f/0x70 net/ipv4/ip_input.c:579\n   ip_sublist_rcv+0x122/0x1b0 net/ipv4/ip_input.c:636\n   ip_list_rcv+0xf7/0x130 net/ipv4/ip_input.c:670\n   __netif_receive_skb_list_core+0x21d/0x240 net/core/dev.c:6067\n   netif_receive_skb_list_internal+0x186/0x2b0 net/core/dev.c:6210\n   napi_complete_done+0x78/0x180 net/core/dev.c:6580\n   tun_get_user+0xa63/0x1120 drivers/net/tun.c:1909\n   tun_chr_write_iter+0x65/0xb0 drivers/net/tun.c:1984\n   vfs_write+0x300/0x420 fs/read_write.c:593\n   ksys_write+0x60/0xd0 fs/read_write.c:686\n   do_syscall_64+0x50/0x1c0 arch/x86/entry/syscall_64.c:63\n   \u003c/TASK\u003e\n\nTo trigger gso segment in udp_queue_rcv_skb(), we should also set option\nUDP_ENCAP_ESPINUDP to enable udp_sk(sk)-\u003eencap_rcv. When the encap_rcv\nhook return 1 in udp_queue_rcv_one_skb(), udp_csum_pull_header() will try\nto pull udphdr, but the skb size has been segmented to gso size, which\nleads to this crash.\n\nPrevious commit cf329aa42b66 (\"udp: cope with UDP GRO packet misdirection\")\nintroduces segmentation in UDP receive path only for GRO, which was never\nintended to be used for UFO, so drop UFO packets in udp_rcv_segment()."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-09-29T05:54:57.985Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/72f97d3cb791e26492236b2be7fd70d2c6222555"
        },
        {
          "url": "https://git.kernel.org/stable/c/df6ad849d59256dcc0e2234844ef9f0daf885f5c"
        },
        {
          "url": "https://git.kernel.org/stable/c/4c1022220b1b6fea802175e80444923a3bbf93a5"
        },
        {
          "url": "https://git.kernel.org/stable/c/791f32c5eab33ca3a153f8f6f763aa0df1ddc320"
        },
        {
          "url": "https://git.kernel.org/stable/c/0d45954034f8edd6d4052e0190d3d6335c37e4de"
        },
        {
          "url": "https://git.kernel.org/stable/c/c0ec2e47f1e92d69b42b17a4a1e543256778393e"
        },
        {
          "url": "https://git.kernel.org/stable/c/fc45b3f9599b657d4a64bcf423d2a977b3e13a49"
        },
        {
          "url": "https://git.kernel.org/stable/c/0c639c6479ec4480372901a5fc566f7588cf5522"
        },
        {
          "url": "https://git.kernel.org/stable/c/d46e51f1c78b9ab9323610feb14238d06d46d519"
        }
      ],
      "title": "net: drop UFO packets in udp_rcv_segment()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2025-38622",
    "datePublished": "2025-08-22T16:00:31.343Z",
    "dateReserved": "2025-04-16T04:51:24.029Z",
    "dateUpdated": "2025-11-03T17:40:32.369Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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Sightings

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  • 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.
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  • 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.



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