CVE-2026-93815: Linux kernel · net: au1000: move free_irq out of the close-time spinlocked section
Affects Linux kernelSource GCVE Database
Not known to be exploited.
Data as of 26 Oct 2026, 17:16 UTC
Rated by Threat Radar · CVSS not yet scored by NVD
- EPSS
- 0.1% chance of exploitation in 30 days – higher than 6% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Exploitation evidence
Disclosed: evidence found.
CVE published 24 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
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 fix is available that moves the free_irq() call outside the spinlocked section in the au1000_close() function. Users should apply the updated Linux kernel versions containing this fix. Since this is a kernel code correction, upgrading to patched kernel versions is the recommended remediation.
Description
A vulnerability in the Linux kernel's au1000 network driver involved calling free_irq() while holding a spinlock, which is unsafe because free_irq() can sleep. This issue was identified by static analysis and manual review. The fix moves the free_irq() call outside the spinlocked section to prevent sleeping in an invalid context.
References
- ubuntu.com/security/CVE-2026-93815 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-93815 (opens in a new tab)
- git.kernel.org/stable/c/f48763beab4eea41fc480c9702ec6eebe8d75e4f (opens in a new tab)
- git.kernel.org/stable/c/4536667fba8ddbaff2f2a135080ae6aabf737b5e (opens in a new tab)
- git.kernel.org/stable/c/fc2233f1ab2a1ca562869bca6987d7477671388c (opens in a new tab)
- nvd.nist.gov/vuln/detail/CVE-2026-93815 (opens in a new tab)
- git.kernel.org/stable/c/26fd652915123a690f19d62b253b545a53f3cd51 (opens in a new tab)
- git.kernel.org/stable/c/d514b08ed61fdffe23604fd3e9e53c07cbe5ac3e (opens in a new tab)
- git.kernel.org/stable/c/e1b5a13249975fec3cf654efa84f57118db2da2c (opens in a new tab)
- git.kernel.org/stable/c/f86bca5b7857b85bfa8afdb4fa895d7c0a3f7ebc (opens in a new tab)