High 8.8Published Sep 16, 2025

CVE-2025-39827net: rose: include node references in rose_neigh refcount

Updated under an hour ago (Oct 27, 2026, 6:30 PM ET)

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Exploited in the last 30 days

In the Linux kernel, the following vulnerability has been resolved: net: rose: include node references in rose_neigh refcount Current implementation maintains two separate reference counting mechanisms: the 'count' field in struct rose_neigh tracks references from rose_node structures, while the 'use' field (now refcount_t) tracks references from rose_sock. This patch merges these two reference counting systems using 'use' field for proper reference management. Specifically, this patch adds incrementing and decrementing of rose_neigh->use when rose_neigh->count is incremented or decremented. This patch also modifies rose_rt_free(), rose_rt_device_down() and rose_clear_route() to properly release references to rose_neigh objects before freeing a rose_node through rose_remove_node(). These changes ensure rose_neigh structures are properly freed only when all references, including those from rose_node structures, are released. As a result, this resolves a slab-use-after-free issue reported by Syzbot.

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 4cce478c3e82a5fc788d72adb2f4c4e983997639; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 9c547c8eee9d1cf6e744611d688b9f725cf9a115; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before d7563b456ed44151e1a82091d96f60166daea89b; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before 384210cceb1873a4c8218b27ba0745444436b728; from 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 before da9c9c877597170b929a6121a68dcd3dd9a80f45	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/4cce478c3e82a5fc788d72adb2f4c4e983997639	patch
https://git.kernel.org/stable/c/9c547c8eee9d1cf6e744611d688b9f725cf9a115	patch
https://git.kernel.org/stable/c/d7563b456ed44151e1a82091d96f60166daea89b	patch
https://git.kernel.org/stable/c/384210cceb1873a4c8218b27ba0745444436b728	patch
https://git.kernel.org/stable/c/da9c9c877597170b929a6121a68dcd3dd9a80f45	patch
https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html	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.