CVE-2026-80866: Linux kernel · tipc: avoid busy looping in tipc_exit_net()
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 10% 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 4 Sep 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 that replaces the busy-wait loop with a proper wait mechanism allowing the thread to sleep until cleanup completes. Users should apply the official Linux kernel updates that address this issue. The vendor advisory confirms that this vulnerability has been fixed. No additional mitigation steps are required beyond applying the patch.
Description
A busy-wait loop vulnerability in the Linux kernel's TIPC subsystem (tipc_exit_net function) could cause excessive CPU usage and potential soft lockups under certain kernel configurations or high priority task conditions. The issue arises when the busy loop waits for UDP bearer cleanup to complete but does not yield CPU properly, leading to wasted CPU cycles. This has been fixed by replacing the busy loop with a proper wait mechanism that allows the thread to sleep until cleanup is done.
References
- nvd.nist.gov/vuln/detail/CVE-2026-80866 (opens in a new tab)
- git.kernel.org/stable/c/522d1d950b9e3b68190a6de7534827c8dccedb73 (opens in a new tab)
- git.kernel.org/stable/c/c1481c94e74c955e0448ddf46b8615a44d840c1e (opens in a new tab)
- ubuntu.com/security/CVE-2026-80866 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-80866 (opens in a new tab)
- git.kernel.org/linus/c1481c94e74c955e0448ddf46b8615a44d840c1e (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)