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CVE-2025-39773— net: bridge: fix soft lockup in br_multicast_query_expired()

EPSS 0.01% · P3

Affected Version Matrix 14

VendorProductVersion RangeStatus
LinuxLinuxd902eee43f1951b358d7347d9165c6af21cf7b1b< 34171b9e53bd1dc264f5556579f2b04f04435c73affected
d902eee43f1951b358d7347d9165c6af21cf7b1b< 43e281fde5e76a866a4d10780c35023f16c0e432affected
d902eee43f1951b358d7347d9165c6af21cf7b1b< 96476b043efb86a94f2badd260f7f99c97bd5893affected
d902eee43f1951b358d7347d9165c6af21cf7b1b< bdb19cd0de739870bb3494c815138b9dc30875c4affected
d902eee43f1951b358d7347d9165c6af21cf7b1b< 5bf5fce8a0c2a70d063af778fdb5b27238174cddaffected
d902eee43f1951b358d7347d9165c6af21cf7b1b< d1547bf460baec718b3398365f8de33d25c5f36faffected
2.6.34affected
< 2.6.34unaffected
… +6 more rows
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I. Basic Information for CVE-2025-39773

Vulnerability Information
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Vulnerability Title
net: bridge: fix soft lockup in br_multicast_query_expired()
Source: NVD (National Vulnerability Database)
Vulnerability Description
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.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于br_multicast_query_expired函数中multicast_query_interval设置过大导致时间溢出，可能触发软锁定问题。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
LinuxLinux d902eee43f1951b358d7347d9165c6af21cf7b1b ~ 34171b9e53bd1dc264f5556579f2b04f04435c73 -
LinuxLinux 2.6.34 -

II. Public POCs for CVE-2025-39773

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III. Intelligence Information for CVE-2025-39773

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Same Patch Batch · Linux · 2025-09-11 · 54 CVEs total

CVE-2025-39774iio: adc: rzg2l_adc: Set driver data before enabling runtime PM
CVE-2025-39791dm: dm-crypt: Do not partially accept write BIOs with zoned targets
CVE-2025-39785drm/hisilicon/hibmc: fix irq_request()'s irq name variable is local
CVE-2025-39788scsi: ufs: exynos: Fix programming of HCI_UTRL_NEXUS_TYPE
CVE-2025-39787soc: qcom: mdt_loader: Ensure we don't read past the ELF header
CVE-2025-39786iio: adc: ad7173: fix channels index for syscalib_mode
CVE-2025-39789crypto: x86/aegis - Add missing error checks
CVE-2025-39777crypto: acomp - Fix CFI failure due to type punning
CVE-2025-39776mm/debug_vm_pgtable: clear page table entries at destroy_args()
CVE-2025-39775mm/mremap: fix WARN with uffd that has remap events disabled
CVE-2025-39779btrfs: subpage: keep TOWRITE tag until folio is cleaned
CVE-2025-39772drm/hisilicon/hibmc: fix the hibmc loaded failed bug
CVE-2025-39771regulator: pca9450: Use devm_register_sys_off_handler
CVE-2025-39770net: gso: Forbid IPv6 TSO with extensions on devices with only IPV6_CSUM
CVE-2025-39769bnxt_en: Fix lockdep warning during rmmod
CVE-2025-39768net/mlx5: HWS, fix complex rules rehash error flow
CVE-2025-39766net/sched: Make cake_enqueue return NET_XMIT_CN when past buffer_limit
CVE-2025-39767LoongArch: Optimize module load time by optimizing PLT/GOT counting
CVE-2025-39765ALSA: timer: fix ida_free call while not allocated
CVE-2025-39764netfilter: ctnetlink: remove refcounting in expectation dumpers

Showing top 20 of 54 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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