CVE-2026-99247: Linux kernel · tracing: Do not initialize tracefs work if tracing is disabled
Affects Linux kernelSource GCVE Database
Not known to be exploited.
Data as of 5 Nov 2026, 00:01 UTC
Rated by Threat Radar · CVSS not yet scored by NVD
Thin evidence
One scorer or none- EPSS
- 0.1% chance of exploitation in 30 days – higher than 5% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Exploitation evidence
Disclosed: evidence found.
CVE published 3 Nov 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: 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 4 Nov 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 is available that adds a check for the tracing_disabled flag before initializing tracefs work, preventing the NULL pointer dereference. Users should apply the official kernel updates that include this fix to avoid the issue.
Description
A vulnerability in the Linux kernel tracing subsystem can cause an early boot NULL pointer dereference leading to a kernel crash (Oops). This occurs if tracing is disabled due to trace buffer allocation failure, but the system later attempts to initialize tracefs work unconditionally. The flaw has been fixed by adding a check to avoid initializing tracefs work when tracing is disabled.
References
- ubuntu.com/security/CVE-2026-99247 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-99247 (opens in a new tab)
- git.kernel.org/stable/c/e8665e884e076d894f3eed8b9ea28e37a6448604 (opens in a new tab)
- git.kernel.org/stable/c/e8cfcd7e60eaa3b0dea4d71c64499604e7081736 (opens in a new tab)
- git.kernel.org/stable/c/813e18881c6472eb229a63180ff42c808e3e949b (opens in a new tab)
- git.kernel.org/stable/c/b3b974008388ab59e44d764ba7a63c988fec2524 (opens in a new tab)
- git.kernel.org/stable/c/7539c61f522ff693d9565a0411386c2236e776cd (opens in a new tab)
- git.kernel.org/stable/c/afd38b10b1c6a5c5d6952b15b990596dab9684e6 (opens in a new tab)