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Review reviewHigh

CVE-2025-39826

Linux Linux, SIMATIC CN 4100, SIMATIC S7-1500 CPU 1518-4 PN/DP MFP

In the Linux kernel, the following vulnerability has been resolved: net: rose: convert 'use' field to refcount_t The 'use' field in struct rose_neigh is used as a reference counter but lacks atomicity. This can lead to race conditions where a rose_neigh structure is freed while still being referenced by other code paths. For example, when rose_neigh->use becomes zero during an ioctl operation via rose_rt_ioctl(), the structure may be removed while its timer is still active, potentially causing use-after-free issues. This patch changes the type of 'use' from unsigned short to refcount_t and...

CVSS
7
EPSS
0.19%
8.58% percentile
CISA KEV
Not listed
Published
2025.09.16
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.19%
Technical severityCVSS 7

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: net: rose: convert 'use' field to refcount_t The 'use' field in struct rose_neigh is used as a reference counter but lacks atomicity. This can lead to race conditions where a rose_neigh structure is freed while still being referenced by other code paths. For example, when rose_neigh->use becomes zero during an ioctl operation via rose_rt_ioctl(), the structure may be removed while its timer is still active, potentially causing use-after-free issues. This patch changes the type of 'use' from unsigned short to refcount_t and...

Affected product and versions

Product
Linux Linux, SIMATIC CN 4100, SIMATIC S7-1500 CPU 1518-4 PN/DP MFP
Affected versions
>= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < fb07156cc0742ba4e93dfcc84280c011d05b301f, >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < f8c29fc437d03a98fb075c31c5be761cc8326284, >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 0085b250fcc79f900c82a69980ec2f3e1871823b, >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < 203e4f42596ede31498744018716a3db6dbb7f51, >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 < d860d1faa6b2ce3becfdb8b0c2b048ad31800061, >= 2.6.12, < V5.0, >= V3.1.6, >= 2.6.12.1 < 6.1.150, >= 6.2 < 6.6.104, >= 6.7 < 6.12.45, >= 6.13 < 6.16.5, 2.6.12, 6.17, 11.0
Fixed versions
6.1.150, 6.6.104, 6.12.45, 6.16.5

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux Linux, SIMATIC CN 4100, SIMATIC S7-1500 CPU 1518-4 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:H/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
CWE-416