What’s Vulnerable › Vulnerabilities

CVE-2025-21761: openvswitch: use RCU protection in ovs_vport_cmd_fill_info()

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-02-27 · updated 2026-10-15
• Weakness: CWE-416

Description

In the Linux kernel, the following vulnerability has been resolved: openvswitch: use RCU protection in ovs_vport_cmd_fill_info() ovs_vport_cmd_fill_info() can be called without RTNL or RCU. Use RCU protection and dev_net_rcu() to avoid potential UAF.

Affected products

• Linux kernel: from 4.15 before 5.4.291; from 5.5 before 5.10.235; from 5.11 before 5.15.179; from 5.16 before 6.1.129; from 6.2 before 6.6.79; from 6.7 before 6.12.16 — fixed in 5.10.235, 5.15.179, 5.4.291, 6.1.129, 6.12.16, 6.13.4

How to fix

Upgrade to a fixed version: Linux kernel 5.10.235, 5.15.179, 5.4.291, 6.1.129. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/5828937742af74666192835d657095d95c53dbd0
• https://git.kernel.org/stable/c/7e01abc34e87abd091e619161a20f54ed4e3e2da
• https://git.kernel.org/stable/c/8ec57509c36c8b9a23e50b7858dda0c520a2d074
• https://git.kernel.org/stable/c/90b2f49a502fa71090d9f4fe29a2f51fe5dff76d
• https://git.kernel.org/stable/c/a849a10de5e04d798f7f286a2f1ca174719a617a
• https://git.kernel.org/stable/c/a8816b3f1f151373fd30f1996f00480126c8bb11
• https://git.kernel.org/stable/c/a884f57600e463f69d7b279c4598b865260b62a1
• https://git.kernel.org/stable/c/e85a25d1a9985645e796039e843d1de581d2de1e
• https://lists.debian.org/debian-lts-announce/2025/03/msg00028.html
• https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html
• https://cert-portal.siemens.com/productcert/html/ssa-265688.html
• https://cert-portal.siemens.com/productcert/html/ssa-784472.html

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