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Linux Kernel: Incorrect Error Handling in efivarfs Module
UBUNTU-CVE-2026-23156
Summary
A bug in the Linux kernel's efivarfs module can cause errors to be hidden, potentially leading to data corruption or crashes. This affects systems using the efivarfs module to manage UEFI variables. To fix this issue, update your Linux kernel to the latest version to ensure correct error handling.
What to do
No fix is available yet. Check with your software vendor for updates.
Affected software
| Vendor | Product | Affected versions | Fix available |
|---|---|---|---|
| canonical | linux-hwe-edge | All versions | – |
| canonical | linux-aws-5.0 | All versions | – |
| canonical | linux-aws-5.3 | All versions | – |
| canonical | linux-azure | All versions | – |
| canonical | linux-azure-5.3 | All versions | – |
| canonical | linux-azure-edge | All versions | – |
| canonical | linux-gcp | All versions | – |
| canonical | linux-gcp-5.3 | All versions | – |
| canonical | linux-gke-4.15 | All versions | – |
| canonical | linux-gke-5.4 | All versions | – |
| canonical | linux-gkeop-5.4 | All versions | – |
| canonical | linux-hwe | All versions | – |
| canonical | linux-hwe-edge | All versions | – |
| canonical | linux-oem | All versions | – |
| canonical | linux-oracle-5.0 | All versions | – |
| canonical | linux-oracle-5.3 | All versions | – |
| canonical | linux-aws-5.11 | All versions | – |
| canonical | linux-aws-5.13 | All versions | – |
| canonical | linux-aws-5.8 | All versions | – |
| canonical | linux-azure-5.11 | All versions | – |
| canonical | linux-azure-5.13 | All versions | – |
| canonical | linux-azure-5.8 | All versions | – |
| canonical | linux-azure-fde | All versions | – |
| canonical | linux-gcp-5.11 | All versions | – |
| canonical | linux-gcp-5.13 | All versions | – |
| canonical | linux-gcp-5.8 | All versions | – |
| canonical | linux-gke | All versions | – |
| canonical | linux-gke-5.15 | All versions | – |
| canonical | linux-gkeop | All versions | – |
| canonical | linux-gkeop-5.15 | All versions | – |
| canonical | linux-hwe-5.11 | All versions | – |
| canonical | linux-hwe-5.13 | All versions | – |
| canonical | linux-hwe-5.8 | All versions | – |
| canonical | linux-intel-5.13 | All versions | – |
| canonical | linux-oem-5.10 | All versions | – |
| canonical | linux-oem-5.13 | All versions | – |
| canonical | linux-oem-5.14 | All versions | – |
| canonical | linux-oem-5.6 | All versions | – |
| canonical | linux-oracle-5.11 | All versions | – |
| canonical | linux-oracle-5.13 | All versions | – |
| canonical | linux-oracle-5.8 | All versions | – |
| canonical | linux-raspi2 | All versions | – |
| canonical | linux-riscv | All versions | – |
| canonical | linux-riscv-5.11 | All versions | – |
| canonical | linux-riscv-5.8 | All versions | – |
| canonical | linux-allwinner-5.19 | All versions | – |
| canonical | linux-aws-5.19 | All versions | – |
| canonical | linux-aws-6.2 | All versions | – |
| canonical | linux-aws-6.5 | All versions | – |
| canonical | linux-aws-6.8 | All versions | – |
| canonical | linux-azure-5.19 | All versions | – |
| canonical | linux-azure-6.2 | All versions | – |
| canonical | linux-azure-6.5 | All versions | – |
| canonical | linux-azure-6.8 | All versions | – |
| canonical | linux-azure-fde-5.19 | All versions | – |
| canonical | linux-azure-fde-6.2 | All versions | – |
| canonical | linux-azure-fde-6.8 | All versions | – |
| canonical | linux-gcp-5.19 | All versions | – |
| canonical | linux-gcp-6.2 | All versions | – |
| canonical | linux-gcp-6.5 | All versions | – |
| canonical | linux-gcp-6.8 | All versions | – |
| canonical | linux-hwe-5.19 | All versions | – |
| canonical | linux-hwe-6.2 | All versions | – |
| canonical | linux-hwe-6.5 | All versions | – |
| canonical | linux-hwe-6.8 | All versions | – |
| canonical | linux-ibm-6.8 | All versions | – |
| canonical | linux-intel-iot-realtime | All versions | – |
| canonical | linux-lowlatency-hwe-5.19 | All versions | – |
| canonical | linux-lowlatency-hwe-6.2 | All versions | – |
| canonical | linux-lowlatency-hwe-6.5 | All versions | – |
| canonical | linux-lowlatency-hwe-6.8 | All versions | – |
| canonical | linux-nvidia-6.2 | All versions | – |
| canonical | linux-nvidia-6.5 | All versions | – |
| canonical | linux-nvidia-6.8 | All versions | – |
| canonical | linux-oem-5.17 | All versions | – |
| canonical | linux-oem-6.0 | All versions | – |
| canonical | linux-oem-6.1 | All versions | – |
| canonical | linux-oem-6.5 | All versions | – |
| canonical | linux-oracle-6.5 | All versions | – |
| canonical | linux-oracle-6.8 | All versions | – |
| canonical | linux-realtime | All versions | – |
| canonical | linux-riscv | All versions | – |
| canonical | linux-riscv-5.19 | All versions | – |
| canonical | linux-riscv-6.5 | All versions | – |
| canonical | linux-riscv-6.8 | All versions | – |
| canonical | linux-starfive-5.19 | All versions | – |
| canonical | linux-starfive-6.2 | All versions | – |
| canonical | linux-starfive-6.5 | All versions | – |
| canonical | linux-realtime-6.8 | All versions | – |
| canonical | linux | All versions | – |
| canonical | linux-aws | All versions | – |
| canonical | linux-aws-6.14 | All versions | – |
| canonical | linux-aws-6.17 | All versions | – |
| canonical | linux-azure | All versions | – |
| canonical | linux-azure-6.11 | All versions | – |
| canonical | linux-azure-6.14 | All versions | – |
| canonical | linux-azure-6.17 | All versions | – |
| canonical | linux-azure-fde | All versions | – |
| canonical | linux-azure-fde-6.14 | All versions | – |
| canonical | linux-azure-fde-6.17 | All versions | – |
| canonical | linux-azure-nvidia | All versions | – |
| canonical | linux-azure-nvidia-6.14 | All versions | – |
| canonical | linux-gcp | All versions | – |
| canonical | linux-gcp-6.11 | All versions | – |
| canonical | linux-gcp-6.14 | All versions | – |
| canonical | linux-gcp-6.17 | All versions | – |
| canonical | linux-gke | All versions | – |
| canonical | linux-gkeop | All versions | – |
| canonical | linux-hwe-6.11 | All versions | – |
| canonical | linux-hwe-6.14 | All versions | – |
| canonical | linux-hwe-6.17 | All versions | – |
| canonical | linux-ibm | All versions | – |
| canonical | linux-lowlatency | All versions | – |
| canonical | linux-lowlatency-hwe-6.11 | All versions | – |
| canonical | linux-nvidia | All versions | – |
| canonical | linux-nvidia-6.11 | All versions | – |
| canonical | linux-nvidia-lowlatency | All versions | – |
| canonical | linux-nvidia-tegra | All versions | – |
| canonical | linux-oem-6.11 | All versions | – |
| canonical | linux-oem-6.14 | All versions | – |
| canonical | linux-oem-6.17 | All versions | – |
| canonical | linux-oem-6.8 | All versions | – |
| canonical | linux-oracle | All versions | – |
| canonical | linux-oracle-6.14 | All versions | – |
| canonical | linux-oracle-6.17 | All versions | – |
| canonical | linux-raspi | All versions | – |
| canonical | linux-raspi-realtime | All versions | – |
| canonical | linux-realtime | All versions | – |
| canonical | linux-riscv | All versions | – |
| canonical | linux-riscv-6.14 | All versions | – |
| canonical | linux-riscv-6.17 | All versions | – |
| canonical | linux-xilinx | All versions | – |
| canonical | linux-aws-fips | All versions | – |
| canonical | linux-azure-fips | All versions | – |
| canonical | linux-fips | All versions | – |
| canonical | linux-gcp-fips | All versions | – |
| canonical | linux-raspi-realtime | All versions | – |
| canonical | linux-realtime | All versions | – |
| canonical | linux-realtime-6.14 | All versions | – |
| canonical | linux | All versions | – |
| canonical | linux-aws | All versions | – |
| canonical | linux-azure | All versions | – |
| canonical | linux-azure-fde | All versions | – |
| canonical | linux-gcp | All versions | – |
| canonical | linux-oracle | All versions | – |
| canonical | linux-raspi | All versions | – |
| canonical | linux-realtime | All versions | – |
| canonical | linux-riscv | All versions | – |
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_e...
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().
- https://ubuntu.com/security/CVE-2026-23156 Third Party Advisory
- https://www.cve.org/CVERecord?id=CVE-2026-23156 Third Party Advisory
- https://git.kernel.org/linus/4b22ec1685ce1fc0d862dcda3225d852fb107995 Third Party Advisory
- https://git.kernel.org/stable/c/3960f1754664661a970dc9ebbab44ff93a0b4c42 Third Party Advisory
- https://git.kernel.org/stable/c/4b22ec1685ce1fc0d862dcda3225d852fb107995 Third Party Advisory
- https://git.kernel.org/stable/c/510a16f1c5c1690b33504052bc13fbc2772c23f8 Third Party Advisory
- https://git.kernel.org/stable/c/89b8ca709eeeabcc11ebba64806677873a2787a8 Third Party Advisory
- https://git.kernel.org/stable/c/e4e15a0a4403c96d9898d8398f0640421df9cb16 Third Party Advisory
Published: 14 Feb 2026 · Updated: 13 Mar 2026 · First seen: 9 Mar 2026