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vuln-cve/data/2026/31xxx/CVE-2026-31503.json
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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2026-31503",
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"state": "PUBLISHED",
"assignerShortName": "Linux",
"dateReserved": "2026-03-09T15:48:24.105Z",
"datePublished": "2026-04-22T13:54:23.221Z",
"dateUpdated": "2026-11-10T12:44:41.506Z"
},
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"dateUpdated": "2026-05-11T22:10:00.326Z"
},
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nudp: Fix wildcard bind conflict check when using hash2\n\nWhen binding a udp_sock to a local address and port, UDP uses\ntwo hashes (udptable->hash and udptable->hash2) for collision\ndetection. The current code switches to \"hash2\" when\nhslot->count > 10.\n\n\"hash2\" is keyed by local address and local port.\n\"hash\" is keyed by local port only.\n\nThe issue can be shown in the following bind sequence (pseudo code):\n\nbind(fd1, \"[fd00::1]:8888\")\nbind(fd2, \"[fd00::2]:8888\")\nbind(fd3, \"[fd00::3]:8888\")\nbind(fd4, \"[fd00::4]:8888\")\nbind(fd5, \"[fd00::5]:8888\")\nbind(fd6, \"[fd00::6]:8888\")\nbind(fd7, \"[fd00::7]:8888\")\nbind(fd8, \"[fd00::8]:8888\")\nbind(fd9, \"[fd00::9]:8888\")\nbind(fd10, \"[fd00::10]:8888\")\n\n/* Correctly return -EADDRINUSE because \"hash\" is used\n * instead of \"hash2\". udp_lib_lport_inuse() detects the\n * conflict.\n */\nbind(fail_fd, \"[::]:8888\")\n\n/* After one more socket is bound to \"[fd00::11]:8888\",\n * hslot->count exceeds 10 and \"hash2\" is used instead.\n */\nbind(fd11, \"[fd00::11]:8888\")\nbind(fail_fd, \"[::]:8888\") /* succeeds unexpectedly */\n\nThe same issue applies to the IPv4 wildcard address \"0.0.0.0\"\nand the IPv4-mapped wildcard address \"::ffff:0.0.0.0\". For\nexample, if there are existing sockets bound to\n\"192.168.1.[1-11]:8888\", then binding \"0.0.0.0:8888\" or\n\"[::ffff:0.0.0.0]:8888\" can also miss the conflict when\nhslot->count > 10.\n\nTCP inet_csk_get_port() already has the correct check in\ninet_use_bhash2_on_bind(). Rename it to\ninet_use_hash2_on_bind() and move it to inet_hashtables.h\nso udp.c can reuse it in this fix."
}
],
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"defaultStatus": "unaffected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"net/ipv4/inet_connection_sock.c",
"net/ipv4/udp.c"
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"cpeApplicability": [
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"nodes": [
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"operator": "OR",
"negate": false,
"cpeMatch": [
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"references": [
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"url": "https://git.kernel.org/stable/c/d6ace0dbcbb7fd285738bb87b42b71b01858c952"
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{
"url": "https://git.kernel.org/stable/c/2297e38114316b26ae02f2d205c49b5511c5ed55"
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{
"url": "https://git.kernel.org/stable/c/e537dd15d0d4ad989d56a1021290f0c674dd8b28"
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"title": "udp: Fix wildcard bind conflict check when using hash2",
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