CVE-2026-99024: Linux kernel · optee: register TEE devices only once fully initialized
Affects Linux kernelSource CVE Database V5
Not known to be exploited · fixed in c108feca0a096f8db25d1b69130035025e9e936d : patch Linux kernel soon.
Data as of 26 Oct 2026, 12:42 UTC
Rated High by Threat Radar's AI analysis · 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.
- Patch
- Available – fixed in c108feca0a096f8db25d1b69130035025e9e936d, 262062c01f5a817104c88bf6eacb7c6ffdc7018d, 681adbc9c7a820279582a295e183fa6a1d1b4ec4 +2
Exploitation evidence
Disclosed: evidence found.
CVE published 23 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
Upgrade to a fixed release listed under Affected software.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in– |
AI-suggested
A fix is available and has been applied in the Linux kernel. The patch moves the tee_device_register() calls to after the full initialization of the optee structure, preventing access to uninitialized data. Users should update to a Linux kernel version that includes this fix. No additional mitigation is indicated.
Description
CVE-2026-99024 is a vulnerability in the Linux kernel's optee driver where TEE devices were registered before full initialization. This premature registration allowed access to uninitialized structures and mutexes, potentially leading to dereferencing null pointers and race conditions. The issue was fixed by deferring device registration until after full initialization of the optee structure.
References
- git.kernel.org/stable/c/262062c01f5a817104c88bf6eacb7c6ffdc7018d (opens in a new tab)
- git.kernel.org/stable/c/8cae1605be8a047ae3a62df07b9474d61462c4f6 (opens in a new tab)
- git.kernel.org/stable/c/681adbc9c7a820279582a295e183fa6a1d1b4ec4 (opens in a new tab)
- git.kernel.org/stable/c/2f7240f0a6fd83df274fc0a2abf0609b4e6bd388 (opens in a new tab)
- git.kernel.org/stable/c/c108feca0a096f8db25d1b69130035025e9e936d (opens in a new tab)