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CVE-2026-23156 — efivarfs: fix error propagation in efivar_entry_get()

Affected: Linux

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().

RHSA-2026:4012 — security update for kernel

security update for kernel

RHSA-2026:9095 — Red Hat Security Advisory: kernel security update

kernel: Linux kernel: Denial of Service via unsafe requeue in rxrpc_recvmsg kernel: Linux kernel: Information disclosure in efivarfs via incorrect error propagation kernel: scsi: target: iscsi: Fix use-after-free in iscsit_dec_session_usage_count() kernel: scsi: target: iscsi: Fix use-after-free in iscsit_dec_conn_usage_count() kernel: kernel: Privilege escalation or denial of service via use-after-free in nf_tables_addchain()