CVE-2026-99093: Linux kernel · mm: don't schedule deferred kernel page table freeing while booting
Affects Linux kernelSource GCVE Database
Not known to be exploited.
Data as of 29 Oct 2026, 00:59 UTC
Rated by Threat Radar · CVSS not yet scored by NVD
Exploitation evidence
Disclosed: evidence found.
CVE published 26 Oct 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 26.10linuxpkg:deb/ubuntu/linux?arch=source&distro=stonkingOther threats | Affected
| Fixed in– |
Ubuntu 26.10linux-awspkg:deb/ubuntu/linux-aws?arch=source&distro=stonkingOther threats | Affected
| Fixed in– |
Ubuntu 26.10linux-azurepkg:deb/ubuntu/linux-azure?arch=source&distro=stonkingOther threats | Affected
| Fixed in– |
Ubuntu 26.10linux-azure-fdepkg:deb/ubuntu/linux-azure-fde?arch=source&distro=stonkingOther threats | Affected
| Fixed in– |
Ubuntu 26.10linux-gcppkg:deb/ubuntu/linux-gcp?arch=source&distro=stonkingOther threats | Affected
| Fixed in– |
Ubuntu 26.10linux-oraclepkg:deb/ubuntu/linux-oracle?arch=source&distro=stonkingOther 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 has been implemented that defers scheduling the kernel page table freeing work until after the system boot completes. Users should update to a Linux kernel version that includes this fix to prevent boot-time panics related to this issue.
Description
A Linux kernel vulnerability was fixed that prevented scheduling deferred kernel page table freeing during system boot. The issue caused kernel panics when using a boot-time function tracer with a filter, due to workqueue usage before initialization. The fix defers scheduling the freeing work until the system is fully booted.
References
- ubuntu.com/security/CVE-2026-99093 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-99093 (opens in a new tab)
- git.kernel.org/stable/c/df6c704a08bc0925d5db047b0a6221f962bda4d9 (opens in a new tab)
- git.kernel.org/stable/c/2fb552b0bee70c24c092720028ab4620f5eb2646 (opens in a new tab)
- git.kernel.org/stable/c/7a25ca170c12a9328f6fcf4410713beb516b01c0 (opens in a new tab)