CVE-2026-23156
HIGHCVSS Vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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3Description
In the Linux kernel, the following vulnerability has been resolved: efivarfs: fix error propagation in efivar_entry_get() efivar_entry_get() always returns success even if the underlying __efivar_entry_get() fails, masking errors. This may result in uninitialized heap memory being copied to userspace in the efivarfs_file_read() path. Fix it by returning the error from __efivar_entry_get().
Analysis
The Linux kernel's efivarfs implementation fails to propagate errors from __efivar_entry_get(), causing the efivar_entry_get() function to mask failures and return success regardless of the underlying operation's result. This error handling flaw enables uninitialized heap memory to be copied to userspace through the efivarfs_file_read() path, potentially exposing sensitive kernel data to local users with read access to efivarfs. …
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Remediation
Within 7 days: Identify all affected systems and apply vendor patches promptly. Monitor vendor channels for patch availability.
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