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Linux Kernel: Uninitialized Memory Copied to Userspace

CVE-2026-23156
Summary

A bug in the Linux kernel's efivarfs module causes it to return incorrect data to users, potentially leading to security issues. This has been fixed in a recent update. To stay secure, make sure your Linux system is running the latest kernel version.

Original title
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...
Original description
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().
Published: 14 Feb 2026 · Updated: 10 Mar 2026 · First seen: 6 Mar 2026