CVE-2025-39773 is a Linux kernel vulnerability affecting Debian and other Linux distributions. It involves a soft lockup in the bridge multicast query function, triggered when the multicast_query_interval is set to an excessively large value, causing a timer overflow and an infinite loop. Rated Medium severity (CVSS 5.5), this local vulnerability (AV:L/AC:L/PR:L) can lead to a denial of service (A:H) on the affected system. There is no evidence of active exploitation, public exploit code, or Metasploit/Nuclei modules, though it has garnered some community discussion and media coverage.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
>= 2.6.34, < 5.15.190CPE matchmatch criteria | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | ||
>= 5.16, < 6.1.149CPE matchmatch criteria | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | ||
>= 6.2, < 6.6.103CPE matchmatch criteria | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | ||
>= 6.7, < 6.12.44CPE matchmatch criteria | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | ||
>= 6.13, < 6.16.4CPE matchmatch criteria | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
CVSS version used by this source: 3.1
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
The average CVE in this peer group has 0.0 Twitter, 0.0 Reddit, 0.0 Bluesky, 0.0 Mastodon, and 0.1 GitHub mentions.
The average CVE in this peer group has 0.1 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.
Linux kernel (Azure) vulnerabilities
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Feb 24, 2026Linux kernel (IBM) vulnerabilities
Feb 24, 2026kernel: net: bridge: fix soft lockup in br_multicast_query_expired()
Sep 11, 2025net: bridge: fix soft lockup in br_multicast_query_expired()
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