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Priority reviewHigh

CVE-2025-21760

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: ndisc: extend RCU protection in ndisc_send_skb() ndisc_send_skb() can be called without RTNL or RCU held. Acquire rcu_read_lock() earlier, so that we can use dev_net_rcu() and avoid a potential UAF.

CVSS
8.1
EPSS
33.4%
98.2% percentile
CISA KEV
Not listed
Published
2025.02.27
PRIORITY ASSESSMENT

Priority review

FIRST EPSS indicates an elevated probability of exploitation.

Known exploitationNot established by KEV
Exploit probability33.4%
Technical severityCVSS 8.1

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: ndisc: extend RCU protection in ndisc_send_skb() ndisc_send_skb() can be called without RTNL or RCU held. Acquire rcu_read_lock() earlier, so that we can use dev_net_rcu() and avoid a potential UAF.

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
>= 1762f7e88eb34f653b4a915be99a102e347dd45e < 10a1f3fece2f0d23a3a618b72b2b4e6f408ef7d1, >= 1762f7e88eb34f653b4a915be99a102e347dd45e < 4d576202b90b1b95a7c428a80b536f91b8201bcc, >= 1762f7e88eb34f653b4a915be99a102e347dd45e < e24d225e4cb8cf108bde00b76594499b98f0a74d, >= 1762f7e88eb34f653b4a915be99a102e347dd45e < a9319d800b5701e7f5e3fa71a5b7c4831fc20d6d, >= 1762f7e88eb34f653b4a915be99a102e347dd45e < ae38982f521621c216fc2f5182cd091f4734641d, >= 1762f7e88eb34f653b4a915be99a102e347dd45e < 789230e5a8c1097301afc802e242c79bc8835c67, >= 1762f7e88eb34f653b4a915be99a102e347dd45e < 04e05112f10354ffc3bb6cc796d553bab161594c, >= 1762f7e88eb34f653b4a915be99a102e347dd45e < ed6ae1f325d3c43966ec1b62ac1459e2b8e45640, >= 2.6.26, >= V3.1.6, >= 2.6.26 < 5.4.291, >= 5.5 < 5.10.235, >= 5.11 < 5.15.179, >= 5.16 < 6.1.129, >= 6.2 < 6.6.79, >= 6.7 < 6.12.16, >= 6.13 < 6.13.4, 6.14
Fixed versions
5.4.291, 5.10.235, 5.15.179, 6.1.129, 6.6.79, 6.12.16, 6.13.4

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:N/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE
CWE-416