CVE-2025-21957: linux kernel Null Dereference — Fix

Description

In the Linux kernel, the following vulnerability has been resolved: scsi: qla1280: Fix kernel oops when debug level > 2 A null dereference or oops exception will eventually occur when qla1280.c driver is compiled with DEBUG_QLA1280 enabled and ql_debug_level > 2. I think its clear from the code that the intention here is sg_dma_len(s) not length of sg_next(s) when printing the debug info.

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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	< 5.4.292
linux	linux_kernel	5.5 — 5.10.236
linux	linux_kernel	5.11 — 5.15.180
linux	linux_kernel	5.16 — 6.1.132
linux	linux_kernel	6.2 — 6.6.84
linux	linux_kernel	6.7 — 6.12.20
linux	linux_kernel	6.13 — 6.13.8
linux	linux_kernel	All

References

Advisories & Patches

https://git.kernel.org/stable/c/11a8dac1177a596648a020a7f3708257a2f95fee https://git.kernel.org/stable/c/24602e2664c515a4f2950d7b52c3d5997463418c https://git.kernel.org/stable/c/5233e3235dec3065ccc632729675575dbe3c6b8a https://git.kernel.org/stable/c/7ac2473e727d67a38266b2b7e55c752402ab588c https://git.kernel.org/stable/c/af71ba921d08c241a817010f96458dc5e5e26762 https://git.kernel.org/stable/c/afa27b7c17a48e01546ccaad0ab017ad0496a522 https://git.kernel.org/stable/c/c737e2a5fb7f90b96a96121da1b50a9c74ae9b8c https://git.kernel.org/stable/c/ea371d1cdefb0951c7127a33bcd7eb931cf44571

Other References

https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html

Frequently Asked Questions

What is CVE-2025-21957? +

In the Linux kernel, the following vulnerability has been resolved: scsi: qla1280: Fix kernel oops when debug level > 2 A null dereference or oops exception will eventually occur when qla1280.c driver is compiled with DEBUG_QLA1280 enabled and ql_debug_level > 2. I think its clear from the code that the intention here is sg_dma_len(s) not length of sg_next(s) when printing the debug info. It has a CVSS v3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2025-21957? +

CVE-2025-21957 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-2025-21957? +

CVE-2025-21957 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-2025-21957? +

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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