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CVE-2026-23156

efivarfs: fix error propagation in efivar_entry_get()

EPSS 0.1%
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().
Affected products
Linux · Linux

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References
https://git.kernel.org/stable/c/3960f1754664661a970dc9ebbab44ff93a0b4c42https://git.kernel.org/stable/c/4b22ec1685ce1fc0d862dcda3225d852fb107995https://git.kernel.org/stable/c/510a16f1c5c1690b33504052bc13fbc2772c23f8https://git.kernel.org/stable/c/89b8ca709eeeabcc11ebba64806677873a2787a8https://git.kernel.org/stable/c/e4e15a0a4403c96d9898d8398f0640421df9cb16