What’s Vulnerable › Vulnerabilities

CVE-2025-40135: ipv6: use RCU in ip6_xmit()

• Severity: high (CVSS 8.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.7% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-11-12 · updated 2026-10-30

Description

In the Linux kernel, the following vulnerability has been resolved: ipv6: use RCU in ip6_xmit() Use RCU in ip6_xmit() in order to use dst_dev_rcu() to prevent possible UAF.

Affected products

• Linux: 4.13 — fixed in 6.18

How to fix

Upgrade to a fixed version: Linux 6.18. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/7a228cfbb66cca49e9baf901c506364f8dfe036b
• https://git.kernel.org/stable/c/9085e56501d93af9f2d7bd16f7fcfacdde47b99c
• https://git.kernel.org/stable/c/bd0905e2122e3680968cd0741966983490bf2ed3
• https://git.kernel.org/stable/c/f0a54d00d2f36de40266f47c27989853e8588656
• https://git.kernel.org/stable/c/f69fec6287565fdeb61f65e700a1184352306943
• https://git.kernel.org/stable/c/f7f9e924f23684b4b23cd9f976cceab24a968e34
• https://cert-portal.siemens.com/productcert/html/ssa-019113.html
• https://cert-portal.siemens.com/productcert/html/ssa-082556.html
• https://cert-portal.siemens.com/productcert/html/ssa-457936.html
• https://cert-portal.siemens.com/productcert/html/ssa-784472.html

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