CVE-2025-68339: Linux kernel · atm/fore200e: Fix possible data race in fore200e_open()
Affects Linux kernelSource GCVE Database
Not known to be exploited · fixed in 5.15.0-1103.110~20.04.1 : update Linux kernel when convenient.
Data as of 26 Oct 2026, 11:42 UTC
Rated by Threat Radar · No CVSS score from NVD or the CNA
- EPSS
- 0.1% chance of exploitation in 30 days – higher than 8% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available – fixed in 5.15.0-1103.110~20.04.1, 5.15.0-1110.119~20.04.1, 5.15.0-1103.112~20.04.1 +70
Exploitation evidence
Disclosed: evidence found.
CVE published 23 Dec 2025
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.
What to do
Upgrade to a fixed release listed under Affected software.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
Ubuntu 25.10linuxpkg:deb/ubuntu/linux@6.17.0-19.19?arch=source&distro=questingOther threats | Affected
| Fixed in
|
Ubuntu 25.10linux-awspkg:deb/ubuntu/linux-aws@6.17.0-1009.9?arch=source&distro=questingOther threats | Affected
| Fixed in
|
Ubuntu 25.10linux-azurepkg:deb/ubuntu/linux-azure@6.17.0-1010.10?arch=source&distro=questingOther threats | Affected
| Fixed in
|
Ubuntu 25.10linux-azure-fdepkg:deb/ubuntu/linux-azure-fde@6.17.0-1017.17?arch=source&distro=questingOther threats | Affected
| Fixed in– |
Ubuntu 25.10linux-gcppkg:deb/ubuntu/linux-gcp@6.17.0-1009.9?arch=source&distro=questingOther threats | Affected
| Fixed in
|
Ubuntu 25.10linux-oraclepkg:deb/ubuntu/linux-oracle@6.17.0-1009.9?arch=source&distro=questingOther threats | Affected
| Fixed in
|
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
AI-suggested
A patch is available and should be applied to affected Linux kernel versions. The issue is fixed by properly locking access to the shared bandwidth resource in the fore200e driver. Users should update their systems to the fixed kernel versions as per the vendor advisory.
Description
A data race vulnerability in the Linux kernel's ATM fore200e driver was fixed by protecting access to a shared bandwidth tracking field with a mutex lock. The flaw involved improper locking in the error handling path of fore200e_open(), which could lead to incorrect bandwidth accounting due to concurrent access. This issue affects certain Linux kernel versions prior to specific patch releases. The vulnerability has been addressed in official updates.
References
- ubuntu.com/security/CVE-2025-68339 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2025-68339 (opens in a new tab)
- git.kernel.org/linus/82fca3d8a4a34667f01ec2351a607135249c9cff (opens in a new tab)
- git.kernel.org/stable/c/1b60f42a639999c37da7f1fbfa1ad29cf4cbdd2d (opens in a new tab)
- git.kernel.org/stable/c/6610361458e7eb6502dd3182f586f91fcc218039 (opens in a new tab)
- git.kernel.org/stable/c/667ac868823224374f819500adc5baa2889c7bc5 (opens in a new tab)
- git.kernel.org/stable/c/82fca3d8a4a34667f01ec2351a607135249c9cff (opens in a new tab)
- git.kernel.org/stable/c/9917ba597cf95f307778e495f71ff25a5064d167 (opens in a new tab)
- git.kernel.org/stable/c/bd1415efbab507b9b995918105eef953013449dd (opens in a new tab)
- git.kernel.org/stable/c/ed34c70d88e2b8b9bc6c3ede88751186d6c6d5d1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8094-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8095-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8096-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8100-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8095-2 (opens in a new tab)
- ubuntu.com/security/notices/USN-8096-2 (opens in a new tab)
- ubuntu.com/security/notices/USN-8094-2 (opens in a new tab)
- ubuntu.com/security/notices/USN-8095-3 (opens in a new tab)
- ubuntu.com/security/notices/USN-8096-3 (opens in a new tab)
- ubuntu.com/security/notices/USN-8096-4 (opens in a new tab)