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

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-02-14 · updated 2026-06-17

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().

Affected products

• Linux kernel: from 6.0 before 6.1.162; from 6.2 before 6.6.123; from 6.7 before 6.12.69; from 6.13 before 6.18.9; 6.19-rc1, 6.19-rc2, 6.19-rc3, 6.19-rc4, 6.19-rc5, 6.19-rc6 (+1) — fixed in 6.1.162, 6.12.69, 6.18.9, 6.6.123

How to fix

Upgrade to a fixed version: Linux kernel 6.1.162, 6.12.69, 6.18.9, 6.6.123. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/3960f1754664661a970dc9ebbab44ff93a0b4c42
• https://git.kernel.org/stable/c/4b22ec1685ce1fc0d862dcda3225d852fb107995
• https://git.kernel.org/stable/c/510a16f1c5c1690b33504052bc13fbc2772c23f8
• https://git.kernel.org/stable/c/89b8ca709eeeabcc11ebba64806677873a2787a8
• https://git.kernel.org/stable/c/e4e15a0a4403c96d9898d8398f0640421df9cb16

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