5.5

CVE-2026-64227: ACPI: driver: Check ACPI_COMPANION() against NULL during probe

Analyzed
AliasesUBUNTU-CVE-2026-64227DEBIAN-CVE-2026-64227
Published 24-07-2026Last modified 27-07-2026

Vulnerability summary

CVE-2026-64227 is a medium (CVSS 5.5) NULL Pointer Dereference vulnerability in linux. EPSS estimates a 0.16% chance of exploitation in the next 30 days, higher than 5.3% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 5.5, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
5.5/10
010
Medium · v3.1 (NVD)
EPSS score
0.16%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 8 · Related 6
MGASA-2026-0336MGASA-2026-0337USN-8618-1USN-8663-1USN-8664-1USN-8728-1

Timeline

  1. 24-07-2026
    PublishedVulnerability first disclosed.
  2. 27-07-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: ACPI: driver: Check ACPI_COMPANION() against NULL during probe Since every platform driver can be forced to match a device that doesn't match its list of device IDs because of device_match_driver_override(), platform drivers that rely on the existence of a device's ACPI companion object should verify its presence. Accordingly, add requisite ACPI_COMPANION() or ACPI_HANDLE() checks against NULL to 13 platform drivers handling core ACPI devices. Also change the value returned by the ACPI thermal zone driver when the device's ACPI companion is not present to -ENODEV for consistency with the other drivers.

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.16%

Chance of exploitation in the next 30 days

Percentile

5%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.16% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu168 products
  • linuxAll versions (No fix recorded) | < 7.0.0-28.28
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 7.0.0-1009.9
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Debian2 products
  • linux< 6.12.100-1 | < 7.0.12-1
  • linux-6.12< 6.12.100-1~deb12u1
Linux2 products
  • linux≥ 5829046825ac89fffc60f2670bc564fda2c0155a, < a9451bf561232314755baf69a5916e0ac77f33fc | ≥ 5829046825ac89fffc60f2670bc564fda2c0155a, < 34f4d0e4e5065237d15651df759a99e81b7f9f51 | ≥ 5829046825ac89fffc60f2670bc564fda2c0155a, < 612ddab8fce04394bd7aebe8e0f2599642e30859 | ≥ 5829046825ac89fffc60f2670bc564fda2c0155a, < e4865a56d013e86e46ea6acea15bb6eae01898ff | 6.7
  • linux_kernel≥ 6.7, < 6.12.97 | ≥ 6.13, < 6.18.40 | ≥ 6.19, < 7.0.11 | 7.1:rc1 | 7.1:rc2 | 7.1:rc3

3 vendors · 172 products

References

15 links
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