CVE-2026-23443
MediumCVSS 5.5Exploitation Probability (EPSS)
Low risk2th percentile - higher than 2% of all known CVEs
Summary
In the Linux kernel, in the ACPI processor module, a previous fix for acpi_processor_errata_piix4() introduced a use-after-free issue. Device pointers may be dereferenced after dropping references to the device objects. Additionally, debug messages about enabling errata may be printed when errata flags are unset. The fix moves message printing to the points where errata flags are set.
Risk Assessment
Use-after-free can lead to kernel panic or potentially arbitrary code execution in kernel context, posing a serious security risk.
Recommendation
Apply the Linux kernel patch that moves message printing to the points where errata flags are set. Update the kernel to a version containing the fix.
Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: ACPI: processor: Fix previous acpi_processor_errata_piix4() fix After commi f132e089fe89 ("ACPI: processor: Fix NULL-pointer dereference in acpi_processor_errata_piix4()"), device pointers may be dereferenced after dropping references to the device objects pointed to by them, which may cause a use-after-free to occur. Moreover, debug messages about enabling the errata may be printed if the errata flags corresponding to them are unset. Address all of these issues by moving message printing to the points in the code where the errata flags are set.