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Review reviewHigh

CVE-2026-31508

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: net: openvswitch: Avoid releasing netdev before teardown completes The patch cited in the Fixes tag below changed the teardown code for OVS ports to no longer unconditionally take the RTNL. After this change, the netdev_destroy() callback can proceed immediately to the call_rcu() invocation if the IFF_OVS_DATAPATH flag is already cleared on the netdev. The ovs_netdev_detach_dev() function clears the flag before completing the unregistration, and if it gets preempted after clearing the flag (as can happen on an -rt kernel),...

CVSS
7.8
EPSS
0.14%
3.39% percentile
CISA KEV
Not listed
Published
2026.04.22
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.14%
Technical severityCVSS 7.8

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: net: openvswitch: Avoid releasing netdev before teardown completes The patch cited in the Fixes tag below changed the teardown code for OVS ports to no longer unconditionally take the RTNL. After this change, the netdev_destroy() callback can proceed immediately to the call_rcu() invocation if the IFF_OVS_DATAPATH flag is already cleared on the netdev. The ovs_netdev_detach_dev() function clears the flag before completing the unregistration, and if it gets preempted after clearing the flag (as can happen on an -rt kernel),...

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
>= b823c3344d5446b720227ba561df10a4f0add515 < df3c95be76103604e752131d9495a24814915ece, >= 052e5db5be4576e0a8ef1460b210da5f328f4cd1 < 33609454be4f582e686a4bf13d4482a5ca0f6c4b, >= c98263d5ace597c096a7a60aeef790da7b54979e < 5fdeaf591a0942772c2d18ff3563697a49ad01c6, >= 0fc642f011cb7a7eff41109e66d3b552e9f4d795 < 4c3e25a7b711a402fcbbbcfbbdf2868ece1ae7c8, >= 5116f61ab11846844585c9082c547c4ccd97ff1a < 43579baa17270aa51f93eb09b6e4af6e047b7f6e, >= f31557fb1b35332cca9994aa196cef284bcf3807 < 95265232b49765a4d00f4d028c100bb7185600f4, >= 5498227676303e3ffa9a3a46214af96bc3e81314 < 755a6300afbd743cda4b102f24f343380ec0e0ff, >= 5498227676303e3ffa9a3a46214af96bc3e81314 < 7c770dadfda5cbbde6aa3c4363ed513f1d212bf8, >= 5.10.248 < 5.10.253, >= 5.15.198 < 5.15.203, >= 6.1.160 < 6.1.168, >= 6.6.120 < 6.6.131, >= 6.12.64 < 6.12.80, >= 6.18.4 < 6.18.21, >= 6.19, >= V3.1.6, >= V3.1.5, >= 6.19.1 < 6.19.11, 6.19, 7.0
Fixed versions
5.10.253, 5.15.203, 6.1.168, 6.6.131, 6.12.80, 6.18.21, 6.19.11

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
Not available