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Review reviewHigh

CVE-2026-31563

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: macb: Use dev_consume_skb_any() to free TX SKBs The napi_consume_skb() function is not intended to be called in an IRQ disabled context. However, after commit 6bc8a5098bf4 ("net: macb: Fix tx_ptr_lock locking"), the freeing of TX SKBs is performed with IRQs disabled. To resolve the following call trace, use dev_consume_skb_any() for freeing TX SKBs: WARNING: kernel/softirq.c:430 at __local_bh_enable_ip+0x174/0x188, CPU#0: ksoftirqd/0/15 Modules linked in: CPU: 0 UID: 0 PID: 15 Comm: ksoftirqd/0 Not tainted 7.0.0-rc4-ne...

CVSS
7.5
EPSS
0.50%
40.1% percentile
CISA KEV
Not listed
Published
2026.04.25
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.50%
Technical severityCVSS 7.5

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: net: macb: Use dev_consume_skb_any() to free TX SKBs The napi_consume_skb() function is not intended to be called in an IRQ disabled context. However, after commit 6bc8a5098bf4 ("net: macb: Fix tx_ptr_lock locking"), the freeing of TX SKBs is performed with IRQs disabled. To resolve the following call trace, use dev_consume_skb_any() for freeing TX SKBs: WARNING: kernel/softirq.c:430 at __local_bh_enable_ip+0x174/0x188, CPU#0: ksoftirqd/0/15 Modules linked in: CPU: 0 UID: 0 PID: 15 Comm: ksoftirqd/0 Not tainted 7.0.0-rc4-ne...

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
>= aeeafeb29b1b270302a9a85a13f7d70a68a3b9e6 < 92e7081f0c79d9073087e54bab745bb184192c2e, >= 5430388a81113e62a2d48b5d7dc1e76231908ebf < 78c8b090a3d5c1689dc989861b0163180db2b3f8, >= 7db8aa3fc4ed0a2928246747b2514b0741a8187e < 984350b37372f79f71d4f0a5264c640e40daf9ce, >= 6bc8a5098bf4a365c4086a4a4130bfab10a58260 < f4bc91398b579730284328322365afa77a9d568f, >= 6bc8a5098bf4a365c4086a4a4130bfab10a58260 < ca4d05afb4683d685bb2c6fccae4386c478f524a, >= 6bc8a5098bf4a365c4086a4a4130bfab10a58260 < 647b8a2fe474474704110db6bd07f7a139e621eb, >= a4cb0a15ab8e6d06c08229a2c7bdbe1f2454473f, >= 6.1.151 < 6.1.168, >= 6.6.105 < 6.6.131, >= 6.12.46 < 6.12.80, >= 6.16.6 < 6.17, >= 6.17, >= V3.1.6, >= V3.1.5, >= 6.17.1 < 6.18.21, >= 6.19 < 6.19.11, 6.17, 7.0
Fixed versions
6.1.168, 6.6.131, 6.12.80, 6.17, 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:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE
Not available
CVE-2026-31563 — Linux Linux, SIMATIC S7-1500 CPU 1518-4 PN/DP MFP, SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP | SECUFOCUS NOW