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Review reviewHigh

CVE-2025-40149

Linux Linux, SIMATIC S7-1500 CPU 1518-4 PN/DP MFP, SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP

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
7.8
EPSS
0.16%
5.33% percentile
CISA KEV
Not listed
Published
2025.11.12
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.16%
Technical severityCVSS 7.8

Vulnerability overview

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 product and versions

Product
Linux Linux, SIMATIC S7-1500 CPU 1518-4 PN/DP MFP, SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP
Affected versions
>= e8f69799810c32dd40c6724d829eccc70baad07f < 2b1bef126bbb8d0da51491357559126d567c1dee, >= e8f69799810c32dd40c6724d829eccc70baad07f < e37ca0092ddace60833790b4ad7a390408fb1be9, >= e8f69799810c32dd40c6724d829eccc70baad07f < 13159c7125636371543a82cb7bbae00ab36730cc, >= e8f69799810c32dd40c6724d829eccc70baad07f < f09cd209359a23f88d4f3fa3d2379d057027e53c, >= e8f69799810c32dd40c6724d829eccc70baad07f < feb474ddbf26b51f462ae2e60a12013bdcfc5407, >= e8f69799810c32dd40c6724d829eccc70baad07f < c65f27b9c3be2269918e1cbad6d8884741f835c5, >= 4.18, >= V3.1.6, >= 4.18 < 5.15.199, >= 5.16 < 6.1.161, >= 6.2 < 6.6.121, >= 6.7 < 6.12.66, >= 6.13 < 6.17.3
Fixed versions
5.15.199, 6.1.161, 6.6.121, 6.12.66, 6.17.3

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux Linux, SIMATIC S7-1500 CPU 1518-4 PN/DP MFP, SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
CWE-416