What’s Vulnerable › Vulnerabilities

CVE-2025-40074: ipv4: start using dst_dev_rcu()

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-10-28 · updated 2026-10-19

Description

In the Linux kernel, the following vulnerability has been resolved: ipv4: start using dst_dev_rcu() Change icmpv4_xrlim_allow(), ip_defrag() to prevent possible UAF. Change ipmr_prepare_xmit(), ipmr_queue_fwd_xmit(), ip_mr_output(), ipv4_neigh_lookup() to use lockdep enabled dst_dev_rcu().

Affected products

• Linux kernel: 4.13 — fixed in 6.18

How to fix

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

References

• https://git.kernel.org/stable/c/684efb2c86c887685f9aa65e1a21b3df6c1f822d
• https://git.kernel.org/stable/c/6ad8de3cefdb6ffa6708b21c567df0dbf82c43a8
• https://git.kernel.org/stable/c/864155c164654110f68a17a63bd0339754790d67
• https://git.kernel.org/stable/c/923e0734c386984d45de508528a7a7ad91d791cc
• https://git.kernel.org/stable/c/e150f273cd8ed34ebc6d03758aad95c12fc58337

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