CVE-2026-72308: Linux kernel · mlxsw: fix refcount leak in mlxsw_sp_port_lag_join()
Affects Linux kernelSource GCVE Database
Not known to be exploited · fixed in 7.0.0-1014.14~24.04.1 : update Linux kernel when convenient.
Data as of 26 Oct 2026, 13:47 UTC
Rated by Threat Radar · CVSS not yet scored by NVD
- EPSS
- 0.2% chance of exploitation in 30 days – higher than 12% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
- Patch
- Available – fixed in 7.0.0-1014.14~24.04.1, 7.0.0-1017.17~24.04.1, 7.0.0-1016.16~24.04.1 +11
Exploitation evidence
Disclosed: evidence found.
CVE published 15 Aug 2026
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 26.04 LTSlinuxpkg:deb/ubuntu/linux?arch=source&distro=resoluteOther threats | Affected
| Fixed in
|
Ubuntu 26.04 LTSlinux-awspkg:deb/ubuntu/linux-aws?arch=source&distro=resoluteOther threats | Affected
| Fixed in
|
Ubuntu 26.04 LTSlinux-azurepkg:deb/ubuntu/linux-azure?arch=source&distro=resoluteOther threats | Affected
| Fixed in
|
Ubuntu 26.04 LTSlinux-azure-fdepkg:deb/ubuntu/linux-azure-fde?arch=source&distro=resoluteOther threats | Affected
| Fixed in
|
Ubuntu 26.04 LTSlinux-gcppkg:deb/ubuntu/linux-gcp?arch=source&distro=resoluteOther threats | Affected
| Fixed in
|
Ubuntu 26.04 LTSlinux-gkepkg:deb/ubuntu/linux-gke?arch=source&distro=resoluteOther 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-azure kernel versions to fix the refcount leak. The vendor advisory confirms the issue is resolved in updated kernel releases. Users should update to the fixed versions listed in the advisory to mitigate this vulnerability.
Description
A refcount leak vulnerability was identified and fixed in the Linux kernel's mlxsw driver, specifically in the mlxsw_sp_port_lag_join() function. The issue occurs when mlxsw_sp_port_lag_index_get() fails, causing the function to return an error without releasing a previously acquired lag reference, leading to a resource leak. This flaw has been addressed by correcting the error handling path to properly release the reference. The vulnerability affects multiple specific versions of the linux-azure kernel. A patch is available to remediate this issue.
References
- nvd.nist.gov/vuln/detail/CVE-2026-72308 (opens in a new tab)
- git.kernel.org/stable/c/1cf8a1af42b1f12a30b7abd34fe4fc23b3170e7e (opens in a new tab)
- git.kernel.org/stable/c/2d8b3c3e129973a51ae924bdcf6993a76b828814 (opens in a new tab)
- git.kernel.org/stable/c/41c8c1d65b32beacd8d916a22457b4f6e47f45af (opens in a new tab)
- git.kernel.org/stable/c/8b3350eacd9df0597bfe36a594df7b9def0b3edf (opens in a new tab)
- git.kernel.org/stable/c/cab468c3c03f4bcd7530ce2783a4140da14efb7b (opens in a new tab)
- ubuntu.com/security/CVE-2026-72308 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-72308 (opens in a new tab)
- git.kernel.org/linus/41c8c1d65b32beacd8d916a22457b4f6e47f45af (opens in a new tab)
- ubuntu.com/security/notices/USN-8888-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8889-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8887-1 (opens in a new tab)
- ubuntu.com/security/notices/USN-8888-2 (opens in a new tab)
- ubuntu.com/security/notices/USN-8887-2 (opens in a new tab)
- ubuntu.com/security/notices/USN-8887-3 (opens in a new tab)