CVE-2021-47651: linux kernel Null Dereference — Fix

Description

In the Linux kernel, the following vulnerability has been resolved: soc: qcom: rpmpd: Check for null return of devm_kcalloc Because of the possible failure of the allocation, data->domains might be NULL pointer and will cause the dereference of the NULL pointer later. Therefore, it might be better to check it and directly return -ENOMEM without releasing data manually if fails, because the comment of the devm_kmalloc() says "Memory allocated with this function is automatically freed on driver detach.".

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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	5.1 — 5.4.189
linux	linux_kernel	5.5 — 5.10.110
linux	linux_kernel	5.11 — 5.15.33
linux	linux_kernel	5.16 — 5.16.19
linux	linux_kernel	5.17 — 5.17.2

References

Advisories & Patches

https://git.kernel.org/stable/c/31b5124d742969ea8bf7a1360596f548ca23e770 https://git.kernel.org/stable/c/5a811126d38f9767a20cc271b34db7c8efc5a46c https://git.kernel.org/stable/c/724376c30af5a57686b223dbcd6188e07d2a1de2 https://git.kernel.org/stable/c/755dbc3d73789ac9f0017c729abf5e4b153bf799 https://git.kernel.org/stable/c/84b89fa877ad576e9ee8130f412cfd592f274508 https://git.kernel.org/stable/c/b5d6eba71997b6d661935d2b15094ac7f9f6132d

Frequently Asked Questions

What is CVE-2021-47651? +

In the Linux kernel, the following vulnerability has been resolved: soc: qcom: rpmpd: Check for null return of devm_kcalloc Because of the possible failure of the allocation, data->domains might be NULL pointer and will cause the dereference of the NULL pointer later. Therefore, it might be better to check it and directly return -ENOMEM without releasing data manually if fails, because the comment of the devm_kmalloc() says "Memory allocated with this function is automatically freed on driver detach.". It has a CVSS v3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2021-47651? +

CVE-2021-47651 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-2021-47651? +

CVE-2021-47651 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-2021-47651? +

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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