CVE-2025-39773 (GCVE-0-2025-39773)
Vulnerability from cvelistv5
Published
2025-09-11 16:56
Modified
2025-09-11 16:56
Severity ?
VLAI Severity ?
EPSS score ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
net: bridge: fix soft lockup in br_multicast_query_expired()
When set multicast_query_interval to a large value, the local variable
'time' in br_multicast_send_query() may overflow. If the time is smaller
than jiffies, the timer will expire immediately, and then call mod_timer()
again, which creates a loop and may trigger the following soft lockup
issue.
watchdog: BUG: soft lockup - CPU#1 stuck for 221s! [rb_consumer:66]
CPU: 1 UID: 0 PID: 66 Comm: rb_consumer Not tainted 6.16.0+ #259 PREEMPT(none)
Call Trace:
<IRQ>
__netdev_alloc_skb+0x2e/0x3a0
br_ip6_multicast_alloc_query+0x212/0x1b70
__br_multicast_send_query+0x376/0xac0
br_multicast_send_query+0x299/0x510
br_multicast_query_expired.constprop.0+0x16d/0x1b0
call_timer_fn+0x3b/0x2a0
__run_timers+0x619/0x950
run_timer_softirq+0x11c/0x220
handle_softirqs+0x18e/0x560
__irq_exit_rcu+0x158/0x1a0
sysvec_apic_timer_interrupt+0x76/0x90
</IRQ>
This issue can be reproduced with:
ip link add br0 type bridge
echo 1 > /sys/class/net/br0/bridge/multicast_querier
echo 0xffffffffffffffff >
/sys/class/net/br0/bridge/multicast_query_interval
ip link set dev br0 up
The multicast_startup_query_interval can also cause this issue. Similar to
the commit 99b40610956a ("net: bridge: mcast: add and enforce query
interval minimum"), add check for the query interval maximum to fix this
issue.
References
Impacted products
| Vendor | Product | Version | |||||||
|---|---|---|---|---|---|---|---|---|---|
| ▼ | Linux | Linux |
Version: d902eee43f1951b358d7347d9165c6af21cf7b1b Version: d902eee43f1951b358d7347d9165c6af21cf7b1b Version: d902eee43f1951b358d7347d9165c6af21cf7b1b Version: d902eee43f1951b358d7347d9165c6af21cf7b1b Version: d902eee43f1951b358d7347d9165c6af21cf7b1b Version: d902eee43f1951b358d7347d9165c6af21cf7b1b |
||||||
|
|||||||||
{
"containers": {
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
"net/bridge/br_multicast.c",
"net/bridge/br_private.h"
],
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"vendor": "Linux",
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]
},
{
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"programFiles": [
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"net/bridge/br_private.h"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "2.6.34"
},
{
"lessThan": "2.6.34",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.190",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.149",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.103",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.44",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.16.*",
"status": "unaffected",
"version": "6.16.4",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "6.17-rc3",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.15.190",
"versionStartIncluding": "2.6.34",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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},
{
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{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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},
{
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}
],
"negate": false,
"operator": "OR"
}
]
}
],
"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\u0027time\u0027 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 \u003cIRQ\u003e\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 \u003c/IRQ\u003e\n\nThis issue can be reproduced with:\n ip link add br0 type bridge\n echo 1 \u003e /sys/class/net/br0/bridge/multicast_querier\n echo 0xffffffffffffffff \u003e\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."
}
],
"providerMetadata": {
"dateUpdated": "2025-09-11T16:56:26.820Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"references": [
{
"url": "https://git.kernel.org/stable/c/34171b9e53bd1dc264f5556579f2b04f04435c73"
},
{
"url": "https://git.kernel.org/stable/c/43e281fde5e76a866a4d10780c35023f16c0e432"
},
{
"url": "https://git.kernel.org/stable/c/96476b043efb86a94f2badd260f7f99c97bd5893"
},
{
"url": "https://git.kernel.org/stable/c/bdb19cd0de739870bb3494c815138b9dc30875c4"
},
{
"url": "https://git.kernel.org/stable/c/5bf5fce8a0c2a70d063af778fdb5b27238174cdd"
},
{
"url": "https://git.kernel.org/stable/c/d1547bf460baec718b3398365f8de33d25c5f36f"
}
],
"title": "net: bridge: fix soft lockup in br_multicast_query_expired()",
"x_generator": {
"engine": "bippy-1.2.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2025-39773",
"datePublished": "2025-09-11T16:56:26.820Z",
"dateReserved": "2025-04-16T07:20:57.129Z",
"dateUpdated": "2025-09-11T16:56:26.820Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.1",
"vulnerability-lookup:meta": {
"nvd": "{\"cve\":{\"id\":\"CVE-2025-39773\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-09-11T17:15:43.010\",\"lastModified\":\"2025-09-15T15:22:38.297\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"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\u0027time\u0027 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 \u003cIRQ\u003e\\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 \u003c/IRQ\u003e\\n\\nThis issue can be reproduced with:\\n ip link add br0 type bridge\\n echo 1 \u003e /sys/class/net/br0/bridge/multicast_querier\\n echo 0xffffffffffffffff \u003e\\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.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/34171b9e53bd1dc264f5556579f2b04f04435c73\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/43e281fde5e76a866a4d10780c35023f16c0e432\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/5bf5fce8a0c2a70d063af778fdb5b27238174cdd\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/96476b043efb86a94f2badd260f7f99c97bd5893\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/bdb19cd0de739870bb3494c815138b9dc30875c4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d1547bf460baec718b3398365f8de33d25c5f36f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
}
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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