CVE-2023-52893: linux kernel Null Dereference — Fix

Description

In the Linux kernel, the following vulnerability has been resolved: gsmi: fix null-deref in gsmi_get_variable We can get EFI variables without fetching the attribute, so we must allow for that in gsmi. commit 859748255b43 ("efi: pstore: Omit efivars caching EFI varstore access layer") added a new get_variable call with attr=NULL, which triggers panic in gsmi.

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CVSS v3.1 Score

5.5

MEDIUM

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

Weakness Type (CWE)

CWE-476 CWE-476

Affected Products

Vendor	Product	Versions
linux	linux_kernel	3.0 — 4.14.304
linux	linux_kernel	4.15 — 4.19.271
linux	linux_kernel	4.20 — 5.4.230
linux	linux_kernel	5.5 — 5.10.165
linux	linux_kernel	5.11 — 5.15.90
linux	linux_kernel	5.16 — 6.1.8
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/32313c11bdc8a02c577abaf865be3664ab30410a https://git.kernel.org/stable/c/6646d769fdb0ce4318ef9afd127f8526d1ca8393 https://git.kernel.org/stable/c/a769b05eeed7accc4019a1ed9799dd72067f1ce8 https://git.kernel.org/stable/c/ae2a9dcc8caa60b1e14671294e5ec902ea5d1dfd https://git.kernel.org/stable/c/eb0421d90f916dffe96b4c049ddf01c0c50620d2 https://git.kernel.org/stable/c/ee5763ef829bd923033510de6d1df7c73f085e4b https://git.kernel.org/stable/c/ffef77794fb5f1245c3249b86342bad2299accb5

Frequently Asked Questions

What is CVE-2023-52893? +

In the Linux kernel, the following vulnerability has been resolved: gsmi: fix null-deref in gsmi_get_variable We can get EFI variables without fetching the attribute, so we must allow for that in gsmi. commit 859748255b43 ("efi: pstore: Omit efivars caching EFI varstore access layer") added a new get_variable call with attr=NULL, which triggers panic in gsmi. It has a CVSS v3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2023-52893? +

CVE-2023-52893 has a CVSS v3.1 score of 5.5 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-2023-52893? +

CVE-2023-52893 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-2023-52893? +

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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CVE-2023-52893