CVE-2026-23156

Summary

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 Software

VendorProductVersion RangeStatus
LinuxLinux2d82e6227ea189c0589e7383a36616ac2a2d248c < 3960f1754664661a970dc9ebbab44ff93a0b4c42affected
LinuxLinux2d82e6227ea189c0589e7383a36616ac2a2d248c < 510a16f1c5c1690b33504052bc13fbc2772c23f8affected
LinuxLinux2d82e6227ea189c0589e7383a36616ac2a2d248c < 89b8ca709eeeabcc11ebba64806677873a2787a8affected
LinuxLinux2d82e6227ea189c0589e7383a36616ac2a2d248c < e4e15a0a4403c96d9898d8398f0640421df9cb16affected
LinuxLinux2d82e6227ea189c0589e7383a36616ac2a2d248c < 4b22ec1685ce1fc0d862dcda3225d852fb107995affected
LinuxLinux6.0affected
LinuxLinux0 < 6.0unaffected
LinuxLinux6.1.162 <= 6.1.*unaffected
LinuxLinux6.6.123 <= 6.6.*unaffected
LinuxLinux6.12.69 <= 6.12.*unaffected
LinuxLinux6.18.9 <= 6.18.*unaffected
LinuxLinux6.19 <= *unaffected

Weaknesses

References