{ "schemaVersion": 1, "attribution": [ { "source": "CISA Known Exploited Vulnerabilities", "url": "https://www.cisa.gov/known-exploited-vulnerabilities-catalog", "licence": "US government work" }, { "source": "GitHub Advisory Database", "url": "https://github.com/advisories", "licence": "CC BY 4.0" }, { "source": "Have I Been Pwned", "url": "https://haveibeenpwned.com/", "licence": "CC BY 4.0" }, { "source": "CVE Program (CVE records)", "url": "https://www.cve.org/Legal/TermsOfUse", "licence": "CVE Terms of Use", "notice": "Copyright © 1999-2026, The MITRE Corporation. CVE is a trademark and the CVE logo is a registered trademark of The MITRE Corporation.", "terms": "CVE Usage: MITRE hereby grants you a perpetual, worldwide, non-exclusive, no-charge, royalty-free, irrevocable copyright license to reproduce, prepare derivative works of, publicly display, publicly perform, sublicense, and distribute Common Vulnerabilities and Exposures (CVE™). Any copy you make for such purposes is authorized provided that you reproduce MITRE's copyright designation and this license in any such copy." }, { "source": "FIRST EPSS", "url": "https://www.first.org/epss/", "licence": "free to use; FIRST requests attribution" } ], "record": { "id": "CVE-2025-38622", "sourceURL": "https://www.cve.org/CVERecord?id=CVE-2025-38622", "idYear": 2025, "status": "PUBLISHED", "publishedAt": "2025-08-22T16:00:31.343Z", "updatedAt": "2026-05-11T21:31:47.095Z", "importedAt": "2026-10-24T01:57:34.152Z", "snapshot": { "id": "cve_2026-10-24_midnight_baseline", "at": "2026-10-24T00:00:00.000Z", "source": "https://github.com/CVEProject/cvelistV5/releases/tag/cve_2026-10-24_0100Z" }, "facts": { "title": "net: drop UFO packets in udp_rcv_segment()", "summary": "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 <0f> 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 \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 \n\nTo trigger gso segment in udp_queue_rcv_skb(), we should also set option\nUDP_ENCAP_ESPINUDP to enable udp_sk(sk)->encap_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().", "affected": [ { "vendor": "Linux", "product": "Linux", "defaultStatus": "unaffected", "versions": [ { "version": "cf329aa42b6659204fee865bbce0ea20462552eb", "status": "affected", "versionType": "git", "lessThan": "72f97d3cb791e26492236b2be7fd70d2c6222555" }, { "version": "cf329aa42b6659204fee865bbce0ea20462552eb", "status": "affected", "versionType": "git", "lessThan": "df6ad849d59256dcc0e2234844ef9f0daf885f5c" }, { "version": "cf329aa42b6659204fee865bbce0ea20462552eb", "status": "affected", "versionType": "git", "lessThan": "4c1022220b1b6fea802175e80444923a3bbf93a5" }, { "version": "cf329aa42b6659204fee865bbce0ea20462552eb", "status": "affected", "versionType": "git", "lessThan": "791f32c5eab33ca3a153f8f6f763aa0df1ddc320" }, { "version": "cf329aa42b6659204fee865bbce0ea20462552eb", "status": "affected", "versionType": "git", "lessThan": "0d45954034f8edd6d4052e0190d3d6335c37e4de" }, { "version": "cf329aa42b6659204fee865bbce0ea20462552eb", "status": "affected", "versionType": "git", "lessThan": "c0ec2e47f1e92d69b42b17a4a1e543256778393e" }, { "version": "cf329aa42b6659204fee865bbce0ea20462552eb", "status": "affected", "versionType": "git", "lessThan": "fc45b3f9599b657d4a64bcf423d2a977b3e13a49" }, { "version": "cf329aa42b6659204fee865bbce0ea20462552eb", "status": "affected", "versionType": "git", "lessThan": "0c639c6479ec4480372901a5fc566f7588cf5522" }, { "version": "cf329aa42b6659204fee865bbce0ea20462552eb", "status": "affected", "versionType": "git", "lessThan": "d46e51f1c78b9ab9323610feb14238d06d46d519" } ] }, { "vendor": "Linux", "product": "Linux", "defaultStatus": "affected", "versions": [ { "version": "5.0", "status": "affected" }, { "version": "0", "status": "unaffected", "versionType": "semver", "lessThan": "5.0" }, { "version": "5.4.297", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.4.*" }, { "version": "5.10.241", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.10.*" }, { "version": "5.15.190", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "5.15.*" }, { "version": "6.1.148", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.1.*" }, { "version": "6.6.102", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.6.*" }, { "version": "6.12.42", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.12.*" }, { "version": "6.15.10", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.15.*" }, { "version": "6.16.1", "status": "unaffected", "versionType": "semver", "lessThanOrEqual": "6.16.*" }, { "version": "6.17", "status": "unaffected", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*" } ] } ] } } }