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Review reviewHigh

CVE-2026-31389

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: spi: fix use-after-free on controller registration failure Make sure to deregister from driver core also in the unlikely event that per-cpu statistics allocation fails during controller registration to avoid use-after-free (of driver resources) and unclocked register accesses.

CVSS
7.8
EPSS
0.12%
1.94% percentile
CISA KEV
Not listed
Published
2026.04.04
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.12%
Technical severityCVSS 7.8

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: spi: fix use-after-free on controller registration failure Make sure to deregister from driver core also in the unlikely event that per-cpu statistics allocation fails during controller registration to avoid use-after-free (of driver resources) and unclocked register accesses.

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
>= 6598b91b5ac32bc756d7c3000a31f775d4ead1c4 < 0e23f50086da7d0b183dfeac26021acfcdee086b, >= 6598b91b5ac32bc756d7c3000a31f775d4ead1c4 < 6bbd385b30c7fb6c7ee0669e9ada91490938c051, >= 6598b91b5ac32bc756d7c3000a31f775d4ead1c4 < afe27c1f43aa57530011f419be6ddf71306565d2, >= 6598b91b5ac32bc756d7c3000a31f775d4ead1c4 < 80f3e8cd2b4ad355b2ad2024cf423f6d183404f7, >= 6598b91b5ac32bc756d7c3000a31f775d4ead1c4 < 23b51bad2eb8787aa74324cfccefb258515ae5ba, >= 6598b91b5ac32bc756d7c3000a31f775d4ead1c4 < 8634e05b08ead636e926022f4a98416e13440df9, >= 6.0, >= V3.1.6, >= V3.1.5, >= 6.0 < 6.1.167, >= 6.2 < 6.6.130, >= 6.7 < 6.12.78, >= 6.13 < 6.18.20, >= 6.19 < 6.19.10, 7.0
Fixed versions
6.1.167, 6.6.130, 6.12.78, 6.18.20, 6.19.10

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
CVE-2026-31389 — Linux Linux, SIMATIC S7-1500 CPU 1518-4 PN/DP MFP, SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP | SECUFOCUS NOW