CVE-2022-49731: linux kernel Null Dereference — Fix

Description

In the Linux kernel, the following vulnerability has been resolved: ata: libata-core: fix NULL pointer deref in ata_host_alloc_pinfo() In an unlikely (and probably wrong?) case that the 'ppi' parameter of ata_host_alloc_pinfo() points to an array starting with a NULL pointer, there's going to be a kernel oops as the 'pi' local variable won't get reassigned from the initial value of NULL. Initialize 'pi' instead to '&ata_dummy_port_info' to fix the possible kernel oops for good... Found by Linux Verification Center (linuxtesting.org) with the SVACE static analysis tool.

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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	< 4.9.320
linux	linux_kernel	4.10 — 4.14.285
linux	linux_kernel	4.15 — 4.19.249
linux	linux_kernel	4.20 — 5.4.200
linux	linux_kernel	5.5 — 5.10.124
linux	linux_kernel	5.11 — 5.15.49
linux	linux_kernel	5.16 — 5.18.6
linux	linux_kernel	All

References

Advisories & Patches

https://git.kernel.org/stable/c/07cbdb4807d369fbda73062a91b570c4dc5ec429 https://git.kernel.org/stable/c/1ac5efee33f29e704226506d429b84575a5d66f8 https://git.kernel.org/stable/c/253334f84c81bc6a43af489f108c0bddad989eef https://git.kernel.org/stable/c/36cd19e7d4e5571d77a2ed20c5b6ef50cf57734a https://git.kernel.org/stable/c/a810bd5af06977a847d1f202b22d7defd5c62497 https://git.kernel.org/stable/c/bf476fe22aa1851bab4728e0c49025a6a0bea307 https://git.kernel.org/stable/c/ca4693e6e06e4fd2b240c0fec47aa2498c94848e https://git.kernel.org/stable/c/ff128fbea720bf763fa345680dda5f050bc24a47

Frequently Asked Questions

What is CVE-2022-49731? +

In the Linux kernel, the following vulnerability has been resolved: ata: libata-core: fix NULL pointer deref in ata_host_alloc_pinfo() In an unlikely (and probably wrong?) case that the 'ppi' parameter of ata_host_alloc_pinfo() points to an array starting with a NULL pointer, there's going to be a kernel oops as the 'pi' local variable won't get reassigned from the initial value of NULL. Initialize 'pi' instead to '&ata_dummy_port_info' to fix the possible kernel oops for good... Found by Linux Verification Center (linuxtesting.org) with the SVACE static analysis tool. It has a CVSS v3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2022-49731? +

CVE-2022-49731 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-2022-49731? +

CVE-2022-49731 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-2022-49731? +

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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