High 8.8Published Sep 16, 2025

CVE-2025-39826net: rose: convert 'use' field to refcount_t

Updated under an hour ago (Oct 27, 2026, 10:50 AM ET)

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No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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 updates all code paths to use rose_neigh_hold() and rose_neigh_put() which operate reference counts atomically.

CVSS: 8.8 HIGH (v3.1, CNA)CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Modified
Record last updated: Oct 14, 2026
First seen by InfoSec Signals: Oct 14, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before fb07156cc0742ba4e93dfcc84280c011d05b301f; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before f8c29fc437d03a98fb075c31c5be761cc8326284; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 0085b250fcc79f900c82a69980ec2f3e1871823b; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 203e4f42596ede31498744018716a3db6dbb7f51; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before d860d1faa6b2ce3becfdb8b0c2b048ad31800061	CNA record
Siemens SIMATIC CN 4100 siemens:simatic_cn_4100 (from the name)	before V5.0	CISA ADP
Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518_4_pn_dp_mfp (from the name)	from V3.1.6	CISA ADP
Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP siemens:simatic_s7_1500_cpu_1518f_4_pn_dp_mfp (from the name)	from V3.1.6	CISA ADP
Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP siemens:siplus_s7_1500_cpu_1518_4_pn_dp_mfp (from the name)	from V3.1.6	CISA ADP
linux linux_kernel linux:linux_kernel	from 2.6.12.1 before 6.1.150; from 6.2 before 6.6.104; from 6.7 before 6.12.45; from 6.13 before 6.16.5; 2.6.12; 2.6.12; 2.6.12; 2.6.12; and 4 more ranges	NVD
debian debian_linux debian:debian_linux	11.0	NVD

References

References

https://git.kernel.org/stable/c/fb07156cc0742ba4e93dfcc84280c011d05b301f	patch
https://git.kernel.org/stable/c/f8c29fc437d03a98fb075c31c5be761cc8326284	patch
https://git.kernel.org/stable/c/0085b250fcc79f900c82a69980ec2f3e1871823b	patch
https://git.kernel.org/stable/c/203e4f42596ede31498744018716a3db6dbb7f51	patch
https://git.kernel.org/stable/c/d860d1faa6b2ce3becfdb8b0c2b048ad31800061	patch
https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html	mailing-list, third-party-advisory
https://cert-portal.siemens.com/productcert/html/ssa-019113.html
https://cert-portal.siemens.com/productcert/html/ssa-032379.html
https://cert-portal.siemens.com/productcert/html/ssa-457936.html

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.