{"id":"CVE-2025-39773","revision":null,"records":[{"revision":"60ad6eec231f40dcaaeb2b35965c3fa2","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2025-39773","aliases":[],"title":"net: bridge: fix soft lockup in br_multicast_query_expired()","description":"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 \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 \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.","state":0,"publishedAt":"2025-09-11T16:56:26.82+00:00","modifiedAt":"2026-10-15T01:08:16.402+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"unaffected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"net/bridge/br_multicast.c\",\n \"net/bridge/br_private.h\"\n ],\n \"versions\": [\n {\n \"version\": \"d902eee43f1951b358d7347d9165c6af21cf7b1b\",\n \"lessThan\": \"34171b9e53bd1dc264f5556579f2b04f04435c73\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"d902eee43f1951b358d7347d9165c6af21cf7b1b\",\n \"lessThan\": \"43e281fde5e76a866a4d10780c35023f16c0e432\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"d902eee43f1951b358d7347d9165c6af21cf7b1b\",\n \"lessThan\": \"96476b043efb86a94f2badd260f7f99c97bd5893\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"d902eee43f1951b358d7347d9165c6af21cf7b1b\",\n \"lessThan\": \"bdb19cd0de739870bb3494c815138b9dc30875c4\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"d902eee43f1951b358d7347d9165c6af21cf7b1b\",\n \"lessThan\": \"5bf5fce8a0c2a70d063af778fdb5b27238174cdd\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"d902eee43f1951b358d7347d9165c6af21cf7b1b\",\n \"lessThan\": \"d1547bf460baec718b3398365f8de33d25c5f36f\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n }\n ]\n }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"affected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"net/bridge/br_multicast.c\",\n \"net/bridge/br_private.h\"\n ],\n \"versions\": [\n {\n \"version\": \"2.6.34\",\n \"status\": \"affected\"\n },\n {\n \"version\": \"0\",\n \"lessThan\": \"2.6.34\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.15.190\",\n \"lessThanOrEqual\": \"5.15.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.1.149\",\n \"lessThanOrEqual\": \"6.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.6.103\",\n \"lessThanOrEqual\": \"6.6.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.12.44\",\n \"lessThanOrEqual\": \"6.12.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.16.4\",\n \"lessThanOrEqual\": \"6.16.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.17\",\n \"lessThanOrEqual\": \"*\",\n \"status\": \"unaffected\",\n \"versionType\": \"original_commit_for_fix\"\n }\n ]\n }"}],"metrics":[],"references":["https://git.kernel.org/stable/c/34171b9e53bd1dc264f5556579f2b04f04435c73","https://git.kernel.org/stable/c/43e281fde5e76a866a4d10780c35023f16c0e432","https://git.kernel.org/stable/c/96476b043efb86a94f2badd260f7f99c97bd5893","https://git.kernel.org/stable/c/bdb19cd0de739870bb3494c815138b9dc30875c4","https://git.kernel.org/stable/c/5bf5fce8a0c2a70d063af778fdb5b27238174cdd","https://git.kernel.org/stable/c/d1547bf460baec718b3398365f8de33d25c5f36f"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2025-39773","license":"CVE Program Terms of Use","key":"cve-program:CVE-2025-39773","identifiers":["CVE-2025-39773"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. 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