What’s Vulnerable › Vulnerabilities

CVE-2025-40149: tls: Use __sk_dst_get() and dst_dev_rcu() in get_netdev_for_sock().

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2025-11-12 · updated 2026-10-19
• Weakness: CWE-416

Description

In the Linux kernel, the following vulnerability has been resolved: tls: Use __sk_dst_get() and dst_dev_rcu() in get_netdev_for_sock(). get_netdev_for_sock() is called during setsockopt(), so not under RCU. Using sk_dst_get(sk)->dev could trigger UAF. Let's use __sk_dst_get() and dst_dev_rcu(). Note that the only ->ndo_sk_get_lower_dev() user is bond_sk_get_lower_dev(), which uses RCU.

Affected products

• Linux kernel: from 4.18 before 5.15.199; from 5.16 before 6.1.161; from 6.2 before 6.6.121; from 6.7 before 6.12.66; from 6.13 before 6.17.3 — fixed in 5.15.199, 6.1.161, 6.12.66, 6.17.3, 6.6.121

How to fix

Upgrade to a fixed version: Linux kernel 5.15.199, 6.1.161, 6.12.66, 6.17.3. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/13159c7125636371543a82cb7bbae00ab36730cc
• https://git.kernel.org/stable/c/2b1bef126bbb8d0da51491357559126d567c1dee
• https://git.kernel.org/stable/c/c65f27b9c3be2269918e1cbad6d8884741f835c5
• https://git.kernel.org/stable/c/e37ca0092ddace60833790b4ad7a390408fb1be9
• https://git.kernel.org/stable/c/f09cd209359a23f88d4f3fa3d2379d057027e53c
• https://git.kernel.org/stable/c/feb474ddbf26b51f462ae2e60a12013bdcfc5407
• https://cert-portal.siemens.com/productcert/html/ssa-019113.html
• https://cert-portal.siemens.com/productcert/html/ssa-457936.html

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