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net: bridge: fix soft lockup in br_multicast_query_expired()

Type: advisorySource: Official CVE List1 source record

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: __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 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.

Announced Source revision 1
Original source ↗

CVE-2025-39773

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2025-39773

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
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Prerequisites
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Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "d902eee43f1951b358d7347d9165c6af21cf7b1b",
        "lessThan": "34171b9e53bd1dc264f5556579f2b04f04435c73",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "d902eee43f1951b358d7347d9165c6af21cf7b1b",
        "lessThan": "43e281fde5e76a866a4d10780c35023f16c0e432",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "d902eee43f1951b358d7347d9165c6af21cf7b1b",
        "lessThan": "96476b043efb86a94f2badd260f7f99c97bd5893",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "d902eee43f1951b358d7347d9165c6af21cf7b1b",
        "lessThan": "bdb19cd0de739870bb3494c815138b9dc30875c4",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "d902eee43f1951b358d7347d9165c6af21cf7b1b",
        "lessThan": "5bf5fce8a0c2a70d063af778fdb5b27238174cdd",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "d902eee43f1951b358d7347d9165c6af21cf7b1b",
        "lessThan": "d1547bf460baec718b3398365f8de33d25c5f36f",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "net/bridge/br_multicast.c",
      "net/bridge/br_private.h"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "2.6.34"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "2.6.34",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.15.190",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.149",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.103",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.44",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.16.4",
        "versionType": "semver",
        "lessThanOrEqual": "6.16.*"
      },
      {
        "status": "unaffected",
        "version": "6.17",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/bridge/br_multicast.c",
      "net/bridge/br_private.h"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2025-39773

Source reference: /cveMetadata/cveId

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Event
#27065 · Revision 1
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