CVE-2026-64205: Linux kernel · i2c: i801: fix hardware state machine corruption in error path
Affects Linux kernelSource CVE Database V5
Not known to be exploited · fixed in ef5a347532932f58748dad485c15039f5168c377 : patch Linux kernel soon.
Data as of 6 Nov 2026, 17:02 UTC
Rated High by Threat Radar's AI analysis · No CVSS score from NVD or the CNA
Thin evidence
One scorer or none- CISA SSVC
- Exploitation
- No evidence of active exploitation and no public proof of concept
- Automatable
- Attackers cannot reliably automate steps 1–4 of the kill chain
- Technical impact
- Limited control over the software or limited information exposure
CISA SSVC assessment, 2026-11-06.
- Patch
- Available – fixed in ef5a347532932f58748dad485c15039f5168c377, bb5133a7d5f3fe5c387770e25f2e00e682ce11ed, 00904687b9c5527d569d9a1ca72119823e735a61 +2
Exploitation evidence
Disclosed: evidence found.
CVE published 20 Jul 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 6 Nov 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 source. Users should update to the fixed kernel versions containing the patch identified by the provided commit hashes. No additional mitigation is required once the system is updated.
Description
CVE-2026-64205 is a vulnerability in the Linux kernel's i2c-i801 driver that causes hardware state machine corruption in the error handling path. This leads to a severe livelock and a hung task panic due to continuous error logging and CPU starvation. The issue arises when the SMBus controller is busy, causing improper hardware register cleanup that interrupts BIOS/ACPI transactions and corrupts the SMBus state machine. The flaw is fixed by adjusting the error handling code to avoid releasing hardware resources that were never acquired.
References
- git.kernel.org/stable/c/2ef69871b313aa0f02182795f5e0f5aa455f203c (opens in a new tab)
- git.kernel.org/stable/c/ef5a347532932f58748dad485c15039f5168c377 (opens in a new tab)
- git.kernel.org/stable/c/bb5133a7d5f3fe5c387770e25f2e00e682ce11ed (opens in a new tab)
- git.kernel.org/stable/c/00904687b9c5527d569d9a1ca72119823e735a61 (opens in a new tab)
- git.kernel.org/stable/c/10dd1a736d557e310a77117832874729a0175d57 (opens in a new tab)