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Review reviewHigh

CVE-2025-38471

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: always refresh the queue when reading sock After recent changes in net-next TCP compacts skbs much more aggressively. This unearthed a bug in TLS where we may try to operate on an old skb when checking if all skbs in the queue have matching decrypt state and geometry. BUG: KASAN: slab-use-after-free in tls_strp_check_rcv+0x898/0x9a0 [tls] (net/tls/tls_strp.c:436 net/tls/tls_strp.c:530 net/tls/tls_strp.c:544) Read of size 4 at addr ffff888013085750 by task tls/13529 CPU: 2 UID: 0 PID: 13529 Comm: tls Not tainted 6.16.0-...

CVSS
7.8
EPSS
0.39%
31.6% percentile
CISA KEV
Not listed
Published
2025.07.28
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.39%
Technical severityCVSS 7.8

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: tls: always refresh the queue when reading sock After recent changes in net-next TCP compacts skbs much more aggressively. This unearthed a bug in TLS where we may try to operate on an old skb when checking if all skbs in the queue have matching decrypt state and geometry. BUG: KASAN: slab-use-after-free in tls_strp_check_rcv+0x898/0x9a0 [tls] (net/tls/tls_strp.c:436 net/tls/tls_strp.c:530 net/tls/tls_strp.c:544) Read of size 4 at addr ffff888013085750 by task tls/13529 CPU: 2 UID: 0 PID: 13529 Comm: tls Not tainted 6.16.0-...

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
>= 0d87bbd39d7fd1135ab9eca672d760470f6508e8 < 730fed2ff5e259495712518e18d9f521f61972bb, >= 0d87bbd39d7fd1135ab9eca672d760470f6508e8 < 1f3a429c21e0e43e8b8c55d30701e91411a4df02, >= 0d87bbd39d7fd1135ab9eca672d760470f6508e8 < cdb767915fc9a15d88d19d52a1455f1dc3e5ddc8, >= 0d87bbd39d7fd1135ab9eca672d760470f6508e8 < c76f6f437c46b2390888e0e1dc7aafafa9f4e0c6, >= 0d87bbd39d7fd1135ab9eca672d760470f6508e8 < 4ab26bce3969f8fd925fe6f6f551e4d1a508c68b, >= 2277d7cbdf47531b2c3cd01ba15255fa955aab35, >= 6.0.6 < 6.1, >= 6.1, >= V3.1.5, >= 6.1.1 < 6.1.147, >= 6.2 < 6.6.100, >= 6.7 < 6.12.40, >= 6.13 < 6.15.8, 6.1, 6.16, 11.0
Fixed versions
6.1, 6.1.147, 6.6.100, 6.12.40, 6.15.8

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-2025-38471 — Linux Linux, SIMATIC S7-1500 CPU 1518-4 PN/DP MFP, SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP | SECUFOCUS NOW