# CVE-2025-40149

## Summary

- **CVE ID:** CVE-2025-40149
- **Severity:** HIGH
- **CVSS Score:** 7.8 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H)
- **CWE:** N/A
- **Published:** Nov 12, 2025
- **Last Modified:** Sep 8, 2026

## 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 — Linux (e8f69799810c32dd40c6724d829eccc70baad07f)
- Linux — Linux (4.18)
- Linux — Linux (0)
- Linux — Linux (5.15.199)
- Linux — Linux (6.1.161)
- Linux — Linux (6.6.121)
- Linux — Linux (6.12.66)
- Linux — Linux (6.17.3)
- Linux — Linux (6.18)

## References

- [CNA](https://git.kernel.org/stable/c/2b1bef126bbb8d0da51491357559126d567c1dee)
- [CNA](https://git.kernel.org/stable/c/e37ca0092ddace60833790b4ad7a390408fb1be9)
- [CNA](https://git.kernel.org/stable/c/13159c7125636371543a82cb7bbae00ab36730cc)
- [CNA](https://git.kernel.org/stable/c/f09cd209359a23f88d4f3fa3d2379d057027e53c)
- [CNA](https://git.kernel.org/stable/c/feb474ddbf26b51f462ae2e60a12013bdcfc5407)
- [CNA](https://git.kernel.org/stable/c/c65f27b9c3be2269918e1cbad6d8884741f835c5)
- [siemens-SADP](https://cert-portal.siemens.com/productcert/html/ssa-019113.html)

## Exploitation Prediction (EPSS)

- **EPSS Score:** 0.16%
- **EPSS Percentile:** 5.7

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-18._