CVE-2025-21998: linux kernel Null Dereference — Fix

Description

In the Linux kernel, the following vulnerability has been resolved: firmware: qcom: uefisecapp: fix efivars registration race Since the conversion to using the TZ allocator, the efivars service is registered before the memory pool has been allocated, something which can lead to a NULL-pointer dereference in case of a racing EFI variable access. Make sure that all resources have been set up before registering the efivars.

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CVSS v3.1 Score

4.7

MEDIUM

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

Weakness Type (CWE)

CWE-367 CWE-367

CWE-476 CWE-476

Affected Products

Vendor	Product	Versions
linux	linux_kernel	6.11 — 6.12.21
linux	linux_kernel	6.13 — 6.13.9
linux	linux_kernel	All
linux	linux_kernel	All
linux	linux_kernel	All
linux	linux_kernel	All
linux	linux_kernel	All
linux	linux_kernel	All
linux	linux_kernel	All

References

Advisories & Patches

https://git.kernel.org/stable/c/c4e37b381a7a243c298a4858fc0a5a74e737c79a https://git.kernel.org/stable/c/da8d493a80993972c427002684d0742560f3be4a https://git.kernel.org/stable/c/f15a2b96a0e41c426c63a932d0e63cde7b9784aa

Frequently Asked Questions

What is CVE-2025-21998? +

In the Linux kernel, the following vulnerability has been resolved: firmware: qcom: uefisecapp: fix efivars registration race Since the conversion to using the TZ allocator, the efivars service is registered before the memory pool has been allocated, something which can lead to a NULL-pointer dereference in case of a racing EFI variable access. Make sure that all resources have been set up before registering the efivars. It has a CVSS v3.1 base score of 4.7 (MEDIUM).

How severe is CVE-2025-21998? +

CVE-2025-21998 has a CVSS v3.1 score of 4.7 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2025-21998? +

CVE-2025-21998 affects products from linux, specifically: linux_kernel. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2025-21998? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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