CVE-2026-64227: Linux kernel · ACPI: driver: Check ACPI_COMPANION() against NULL during probe
Affects Linux kernelSource CVE Database V5
Not known to be exploited · fixed in e4865a56d013e86e46ea6acea15bb6eae01898ff : update Linux kernel when convenient.
Data as of 6 Nov 2026, 16:51 UTC
Rated Medium 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 e4865a56d013e86e46ea6acea15bb6eae01898ff, a9451bf561232314755baf69a5916e0ac77f33fc, 612ddab8fce04394bd7aebe8e0f2599642e30859 +1
Exploitation evidence
Disclosed: evidence found.
CVE published 24 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 Linux kernel to e4865a56d013e86e46ea6acea15bb6eae01898ff, a9451bf561232314755baf69a5916e0ac77f33fc, 612ddab8fce04394bd7aebe8e0f2599642e30859 or 34f4d0e4e5065237d15651df759a99e81b7f9f51.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
|
| 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 in Linux kernel version 6.7 and later. Users and administrators should upgrade to version 6.7 or apply the corresponding patches to ensure the ACPI companion NULL checks are in place. No additional mitigation steps are indicated.
Description
A vulnerability in the Linux kernel's ACPI driver was fixed by adding checks for NULL values returned by ACPI_COMPANION() during device probing. This issue affected platform drivers that rely on the presence of a device's ACPI companion object, which could be forced to match devices incorrectly due to device_match_driver_override(). The fix involved adding necessary NULL checks to 13 platform drivers and standardizing error returns in the ACPI thermal zone driver.
References
- git.kernel.org/stable/c/a9451bf561232314755baf69a5916e0ac77f33fc (opens in a new tab)
- git.kernel.org/stable/c/34f4d0e4e5065237d15651df759a99e81b7f9f51 (opens in a new tab)
- git.kernel.org/stable/c/612ddab8fce04394bd7aebe8e0f2599642e30859 (opens in a new tab)
- git.kernel.org/stable/c/e4865a56d013e86e46ea6acea15bb6eae01898ff (opens in a new tab)