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VulnerabilityPublished Updated

CVE-2026-93251: Linux kernel · ACPI: bus: Introduce acpi_bus_get_primary_device()

Source GCVE Database

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Authoritative record:CVE-2026-93251· High

Not known to be exploited · fixed in fd4f907b558721716da30acd6630191acf811b95 : patch Linux kernel soon.

Data as of 30 Oct 2026, 18:03 UTC

Severity
High

Rated High by Threat Radar's AI analysis · CVSS not yet scored by NVD

Thin evidence

One scorer or none
Patch
Available – fixed in fd4f907b558721716da30acd6630191acf811b95, f912f88126e385f6cfcd1a28de73afb7d3943c8d, ebdd932dc24c1cf7cc31710b7730515e4e66d886 +3

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 24 Sep 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq 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 30 Oct 2026.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

ProductAffectedFixed in
LinuxLinuxAffected
  • ≥ 91e5687805885f9fceb60b95e950a3d3bdcf4764, < fd4f907b558721716da30acd6630191acf811b95
Fixed in
  • fd4f907b558721716da30acd6630191acf811b95
LinuxLinuxAffected
  • ≥ 91e5687805885f9fceb60b95e950a3d3bdcf4764, < f912f88126e385f6cfcd1a28de73afb7d3943c8d
Fixed in
  • f912f88126e385f6cfcd1a28de73afb7d3943c8d
LinuxLinuxAffected
  • ≥ 91e5687805885f9fceb60b95e950a3d3bdcf4764, < ebdd932dc24c1cf7cc31710b7730515e4e66d886
Fixed in
  • ebdd932dc24c1cf7cc31710b7730515e4e66d886
LinuxLinuxAffected
  • ≥ 91e5687805885f9fceb60b95e950a3d3bdcf4764, < 5657859851abb65105220a6cdb5804926249f714
Fixed in
  • 5657859851abb65105220a6cdb5804926249f714
LinuxLinuxAffected
  • ≥ 91e5687805885f9fceb60b95e950a3d3bdcf4764, < 72530e1f72b0515a73fd88292254d04fecf03649
Fixed in
  • 72530e1f72b0515a73fd88292254d04fecf03649
LinuxLinuxAffected
  • ≥ 91e5687805885f9fceb60b95e950a3d3bdcf4764, < 50ddd82b88b1d1cc467b5df953344c1a9feec268
Fixed in
  • 50ddd82b88b1d1cc467b5df953344c1a9feec268

AI-suggested

A new function acpi_bus_get_primary_device() was introduced to safely obtain the primary physical device with proper reference counting, mitigating the use-after-free vulnerability. Users should update to Linux kernel versions that include this fix once available.

Description

A use-after-free vulnerability was identified in the Linux kernel's ACPI bus subsystem related to obtaining the first physical device associated with an ACPI device. The existing function acpi_get_first_physical_node() could return a stale device pointer due to a race condition involving device unbinding. This could lead to a use-after-free if the returned pointer is used. A new function, acpi_bus_get_primary_device(), was introduced to safely obtain the primary physical device with proper reference counting, preventing this issue. No intentional functional impact was reported.

References

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