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Vulnerability record · CVE-2025-40149 · published 12 November 2025

CVE-2025-40149: Linux kernel use after free vulnerability

Linux · Linux Kernel

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.

7.8 CVSS 3.1 High EPSS 0.16% · top 95.5% CWE-416 · Use after free
7.8CVSS 3.1 base score
0.16%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
7References
30 Jul 2026Last modified by NVD

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.

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

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

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Source: NIST National Vulnerability Database (record CVE-2025-40149), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.