CVE-2025-39773 (GCVE-0-2025-39773)
Vulnerability from cvelistv5 – Published: 2025-09-11 16:56 – Updated: 2026-09-08 08:42
VLAI
EPSS
VEX
Title
net: bridge: fix soft lockup in br_multicast_query_expired()
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.
Severity
5.5 (Medium)
Assigner
References
10 references
Impacted products
9 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
d902eee43f1951b358d7347d9165c6af21cf7b1b , < 34171b9e53bd1dc264f5556579f2b04f04435c73
(git)
Affected: d902eee43f1951b358d7347d9165c6af21cf7b1b , < 43e281fde5e76a866a4d10780c35023f16c0e432 (git) Affected: d902eee43f1951b358d7347d9165c6af21cf7b1b , < 96476b043efb86a94f2badd260f7f99c97bd5893 (git) Affected: d902eee43f1951b358d7347d9165c6af21cf7b1b , < bdb19cd0de739870bb3494c815138b9dc30875c4 (git) Affected: d902eee43f1951b358d7347d9165c6af21cf7b1b , < 5bf5fce8a0c2a70d063af778fdb5b27238174cdd (git) Affected: d902eee43f1951b358d7347d9165c6af21cf7b1b , < d1547bf460baec718b3398365f8de33d25c5f36f (git) |
guessed | |
| Linux | Linux |
Affected:
2.6.34
Unaffected: 0 , < 2.6.34 (semver) Unaffected: 5.15.190 , ≤ 5.15.* (semver) Unaffected: 6.1.149 , ≤ 6.1.* (semver) Unaffected: 6.6.103 , ≤ 6.6.* (semver) Unaffected: 6.12.44 , ≤ 6.12.* (semver) Unaffected: 6.16.4 , ≤ 6.16.* (semver) Unaffected: 6.17 , ≤ * (original_commit_for_fix) |
guessed | |
| Siemens | SIMATIC CN 4100 |
Affected:
0 , < V5.0
(custom)
|
guessed | |
| Siemens | SIMATIC S7-1500 CPU 1518-4 PN/DP MFP |
Affected:
V3.1.5 , < *
(custom)
|
guessed | |
| Siemens | SIMATIC S7-1500 CPU 1518-4 PN/DP MFP |
Affected:
V3.1.6 , < *
(custom)
|
guessed | |
| Siemens | SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP |
Affected:
V3.1.5 , < *
(custom)
|
guessed | |
| Siemens | SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP |
Affected:
V3.1.6 , < *
(custom)
|
guessed | |
| Siemens | SIPLUS S7-1500 CPU 1518-4 PN/DP MFP |
Affected:
V3.1.5 , < *
(custom)
|
guessed | |
| Siemens | SIPLUS S7-1500 CPU 1518-4 PN/DP MFP |
Affected:
V3.1.6 , < *
(custom)
|
guessed |
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"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."
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"date": "2026-09-15",
"epss": "0.0012",
"percentile": "0.02038"
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"cve": "CVE-2025-39773",
"id": "msrc_CVE-2025-39773",
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"status": "final",
"title": "net: bridge: fix soft lockup in br_multicast_query_expired()",
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[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 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"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-06-30T01:20:04+00:00",
"cve": "CVE-2025-39773",
"id": "CVE-2025-39773",
"initial_release_date": "2025-09-11T00:00:00+00:00",
"product_status:known_affected": "274",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: net: bridge: fix soft lockup in br_multicast_query_expired()",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-39773.json",
"version": "3"
},
"suse_vex": {
"aggregate_severity": "moderate",
"current_release_date": "2026-09-11T01:58:49Z",
"cve": "CVE-2025-39773",
"id": "CVE-2025-39773",
"initial_release_date": "2025-09-11T23:23:59Z",
"product_status:first_fixed": "2",
"product_status:known_affected": "729",
"product_status:recommended": "509",
"source": "SUSE CSAF VEX",
"status": "interim",
"title": "SUSE CVE CVE-2025-39773",
"url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2025-39773.json",
"version": "54"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- 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.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- 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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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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