Linux Kernel up to 6.17-rc3 net rose_rt_ioctl reference count

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5.8$0-$5k0.00

Summaryinfo

A vulnerability described as critical has been identified in Linux Kernel up to 6.1.149/6.6.103/6.12.44/6.16.4/6.17-rc3. Affected by this vulnerability is the function rose_rt_ioctl of the component net. Such manipulation leads to reference count. This vulnerability is traded as CVE-2025-39826. There is no exploit available. Upgrading the affected component is recommended.

Detailsinfo

A vulnerability, which was classified as critical, has been found in Linux Kernel up to 6.1.149/6.6.103/6.12.44/6.16.4/6.17-rc3. Affected by this issue is the function rose_rt_ioctl of the component net. The manipulation with an unknown input leads to a reference count vulnerability. Using CWE to declare the problem leads to CWE-911. The product uses a reference count to manage a resource, but it does not update or incorrectly updates the reference count. Impacted is availability. CVE summarizes:

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.

The advisory is available at git.kernel.org. This vulnerability is handled as CVE-2025-39826 since 04/16/2025. The exploitation is known to be difficult. Technical details are known, but there is no available exploit.

The vulnerability scanner Nessus provides a plugin with the ID 265277 (Linux Distros Unpatched Vulnerability : CVE-2025-39826), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 6.1.150, 6.6.104, 6.12.45, 6.16.5 or 6.17-rc4 eliminates this vulnerability. Applying the patch fb07156cc0742ba4e93dfcc84280c011d05b301f/f8c29fc437d03a98fb075c31c5be761cc8326284/0085b250fcc79f900c82a69980ec2f3e1871823b/203e4f42596ede31498744018716a3db6dbb7f51/d860d1faa6b2ce3becfdb8b0c2b048ad31800061 is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the databases at Tenable (265277) and CERT Bund (WID-SEC-2025-2077). If you want to get best quality of vulnerability data, you may have to visit VulDB.

Affected

  • Debian Linux
  • Amazon Linux 2
  • Red Hat Enterprise Linux
  • Ubuntu Linux
  • SUSE Linux
  • Oracle Linux
  • IBM QRadar SIEM
  • SUSE openSUSE
  • Open Source Linux Kernel
  • RESF Rocky Linux
  • Dell Secure Connect Gateway

Productinfo

Type

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Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.9
VulDB Meta Temp Score: 5.8

VulDB Base Score: 4.8
VulDB Temp Score: 4.6
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 7.0
NVD Vector: 🔒

CVSSv2info

AVACAuCIA
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Reference count
CWE: CWE-911 / CWE-664
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: Partially

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 265277
Nessus Name: Linux Distros Unpatched Vulnerability : CVE-2025-39826

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 6.1.150/6.6.104/6.12.45/6.16.5/6.17-rc4
Patch: fb07156cc0742ba4e93dfcc84280c011d05b301f/f8c29fc437d03a98fb075c31c5be761cc8326284/0085b250fcc79f900c82a69980ec2f3e1871823b/203e4f42596ede31498744018716a3db6dbb7f51/d860d1faa6b2ce3becfdb8b0c2b048ad31800061

Timelineinfo

04/16/2025 CVE reserved
09/16/2025 +153 days Advisory disclosed
09/16/2025 +0 days VulDB entry created
01/16/2026 +122 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2025-39826 (🔒)
GCVE (CVE): GCVE-0-2025-39826
GCVE (VulDB): GCVE-100-324434
CERT Bund: WID-SEC-2025-2077 - Linux Kernel: Mehrere Schwachstellen

Entryinfo

Created: 09/16/2025 16:04
Updated: 01/16/2026 22:33
Changes: 09/16/2025 16:04 (59), 09/18/2025 17:11 (2), 10/21/2025 09:06 (7), 12/27/2025 18:36 (1), 01/16/2026 22:33 (11)
Complete: 🔍
Cache ID: 216::103

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