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vuln-cve/data/2025/39xxx/CVE-2025-39773.json
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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2025-39773",
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"state": "PUBLISHED",
"assignerShortName": "Linux",
"dateReserved": "2025-04-16T07:20:57.129Z",
"datePublished": "2025-09-11T16:56:26.820Z",
"dateUpdated": "2026-11-10T12:36:59.811Z"
},
"containers": {
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"shortName": "Linux",
"dateUpdated": "2026-05-11T21:35:58.984Z"
},
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: bridge: fix soft lockup in br_multicast_query_expired()\n\nWhen set multicast_query_interval to a large value, the local variable\n'time' in br_multicast_send_query() may overflow. If the time is smaller\nthan jiffies, the timer will expire immediately, and then call mod_timer()\nagain, which creates a loop and may trigger the following soft lockup\nissue.\n\n watchdog: BUG: soft lockup - CPU#1 stuck for 221s! [rb_consumer:66]\n CPU: 1 UID: 0 PID: 66 Comm: rb_consumer Not tainted 6.16.0+ #259 PREEMPT(none)\n Call Trace:\n <IRQ>\n __netdev_alloc_skb+0x2e/0x3a0\n br_ip6_multicast_alloc_query+0x212/0x1b70\n __br_multicast_send_query+0x376/0xac0\n br_multicast_send_query+0x299/0x510\n br_multicast_query_expired.constprop.0+0x16d/0x1b0\n call_timer_fn+0x3b/0x2a0\n __run_timers+0x619/0x950\n run_timer_softirq+0x11c/0x220\n handle_softirqs+0x18e/0x560\n __irq_exit_rcu+0x158/0x1a0\n sysvec_apic_timer_interrupt+0x76/0x90\n </IRQ>\n\nThis issue can be reproduced with:\n ip link add br0 type bridge\n echo 1 > /sys/class/net/br0/bridge/multicast_querier\n echo 0xffffffffffffffff >\n \t/sys/class/net/br0/bridge/multicast_query_interval\n ip link set dev br0 up\n\nThe multicast_startup_query_interval can also cause this issue. Similar to\nthe commit 99b40610956a (\"net: bridge: mcast: add and enforce query\ninterval minimum\"), add check for the query interval maximum to fix this\nissue."
}
],
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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],
"versions": [
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"cpeApplicability": [
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"nodes": [
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"negate": false,
"cpeMatch": [
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"versionStartIncluding": "2.6.34",
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{
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"url": "https://git.kernel.org/stable/c/43e281fde5e76a866a4d10780c35023f16c0e432"
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{
"url": "https://git.kernel.org/stable/c/96476b043efb86a94f2badd260f7f99c97bd5893"
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{
"url": "https://git.kernel.org/stable/c/d1547bf460baec718b3398365f8de33d25c5f36f"
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"title": "net: bridge: fix soft lockup in br_multicast_query_expired()",
"x_generator": {
"engine": "bippy-1.2.0"
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},
"adp": [
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"title": "CVE Program Container",
"references": [
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"providerMetadata": {
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"shortName": "CVE",
"dateUpdated": "2025-11-03T17:43:14.694Z"
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