CVE-2023-53658: linux kernel Null Dereference — Fix

Description

In the Linux kernel, the following vulnerability has been resolved: spi: bcm-qspi: return error if neither hif_mspi nor mspi is available If neither a "hif_mspi" nor "mspi" resource is present, the driver will just early exit in probe but still return success. Apart from not doing anything meaningful, this would then also lead to a null pointer access on removal, as platform_get_drvdata() would return NULL, which it would then try to dereference when trying to unregister the spi master. Fix this by unconditionally calling devm_ioremap_resource(), as it can handle a NULL res and will then return a viable ERR_PTR() if we get one. The "return 0;" was previously a "goto qspi_resource_err;" where then ret was returned, but since ret was still initialized to 0 at this place this was a valid conversion in 63c5395bb7a9 ("spi: bcm-qspi: Fix use-after-free on unbind"). The issue was not introduced by this commit, only made more obvious.

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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	4.9 — 4.14.322
linux	linux_kernel	4.15 — 4.19.291
linux	linux_kernel	4.20 — 5.4.251
linux	linux_kernel	5.5 — 5.10.188
linux	linux_kernel	5.11 — 5.15.121
linux	linux_kernel	5.16 — 6.1.39
linux	linux_kernel	6.2 — 6.4.4

References

Advisories & Patches

https://git.kernel.org/stable/c/217b6ea8cf7b819477bca597a6ae2d43d38ba283 https://git.kernel.org/stable/c/22ae32d80ef590d12a2364e4621f90f7c58445c7 https://git.kernel.org/stable/c/32b9c8f7892c19f7f5c9fed5fb410b9fd5990bb6 https://git.kernel.org/stable/c/398e6a015877d44327f754aeb48ff3354945c78c https://git.kernel.org/stable/c/7c1f23ad34fcdace50275a6aa1e1969b41c6233f https://git.kernel.org/stable/c/a91c34357afcfaa5307e254f22a8452550a07b34 https://git.kernel.org/stable/c/d20db3c58a7f9361e370a7850ceb60dbdf62eea3 https://git.kernel.org/stable/c/d3dcdb43c872a3b967345144151a2c9bb9124c9b

Frequently Asked Questions

What is CVE-2023-53658? +

In the Linux kernel, the following vulnerability has been resolved: spi: bcm-qspi: return error if neither hif_mspi nor mspi is available If neither a "hif_mspi" nor "mspi" resource is present, the driver will just early exit in probe but still return success. Apart from not doing anything meaningful, this would then also lead to a null pointer access on removal, as platform_get_drvdata() would return NULL, which it would then try to dereference when trying to unregister the spi master. Fix this by unconditionally calling devm_ioremap_resource(), as it can handle a NULL res and will then return a viable ERR_PTR() if we get one. The "return 0;" was previously a "goto qspi_resource_err;" where then ret was returned, but since ret was still initialized to 0 at this place this was a valid conversion in 63c5395bb7a9 ("spi: bcm-qspi: Fix use-after-free on unbind"). The issue was not introduced by this commit, only made more obvious. It has a CVSS v3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2023-53658? +

CVE-2023-53658 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-2023-53658? +

CVE-2023-53658 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-2023-53658? +

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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