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CVE-2025-24934SO_REUSEPORT_LB breaks connect(2) for UDP sockets

Description

Software which sets SO_REUSEPORT_LB on a socket and then connects it to a host will not directly observe any problems. However, due to its membership in a load-balancing group, that socket will receive packets originating from any host. This breaks the contract of the connect(2) and implied connect via sendto(2), and may leave the application vulnerable to spoofing attacks. The kernel failed to check the connection state of sockets when adding them to load-balancing groups. Furthermore, when looking up the destination socket for an incoming packet, the kernel will match a socket belonging to a load-balancing group even if it is connected, in violation of the contract that connected sockets are only supposed to receive packets originating from the connected host.

Timeline

  1. ID reserved

    By freebsd

  2. · 9 months later

    Published

  3. · 6 months later

    Record updated

Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.

Scores

CVSS scores of CVE-2025-24934, by who scored it
Scored byCVSSScoreVector
CISA-ADPADP (enrichment)3.1Medium5.4CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
NVDNVD · Deferred3.1Medium5.4CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:N
EPSS (exploitation in 30 days)
0.21% · top 88% of all CVEs (15 Nov 2026)
CISA SSVC
Exploitation: none · Automatable: no · Technical impact: partial
Loading the EPSS history…

The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.4.

Affected products

  • FreeBSD · FreeBSD

    • affected 15.0-BETA2 – < p1
    • affected 14.3-RELEASE – < p5
    • affected 13.5-RELEASE – < p6

References

References2

Sources

The same CVE in the primary databases and aggregators, to check against.

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Record last updated .