CVE-2022-50285: linux kernel — Fix

Description

In the Linux kernel, the following vulnerability has been resolved: mm,hugetlb: take hugetlb_lock before decrementing h->resv_huge_pages The h->*_huge_pages counters are protected by the hugetlb_lock, but alloc_huge_page has a corner case where it can decrement the counter outside of the lock. This could lead to a corrupted value of h->resv_huge_pages, which we have observed on our systems. Take the hugetlb_lock before decrementing h->resv_huge_pages to avoid a potential race.

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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

Affected Products

Vendor	Product	Versions
linux	linux_kernel	4.3.6 — 4.4
linux	linux_kernel	4.4.1 — 4.9.332
linux	linux_kernel	4.10 — 4.14.298
linux	linux_kernel	4.15 — 4.19.264
linux	linux_kernel	4.20 — 5.4.223
linux	linux_kernel	5.5 — 5.10.153
linux	linux_kernel	5.11 — 5.15.76
linux	linux_kernel	5.16 — 6.0.6
linux	linux_kernel	All
linux	linux_kernel	All
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/112a005d1ded04a4b41b6d01833cc0bda90625cc https://git.kernel.org/stable/c/11993652d0b49e27272db0a37aa828d8a3a4b92b https://git.kernel.org/stable/c/12df140f0bdfae5dcfc81800970dd7f6f632e00c https://git.kernel.org/stable/c/2b35432d324898ec41beb27031d2a1a864a4d40e https://git.kernel.org/stable/c/3e50a07b6a5fcd39df1534d3fdaca4292a65efe6 https://git.kernel.org/stable/c/568e3812b1778b4c0c229649b59977d88f400ece https://git.kernel.org/stable/c/629c986e19fe9481227c7cdfd9a105bbc104d245 https://git.kernel.org/stable/c/c828fab903725279aa9dc6ae3d44bb7e4778f92c

Frequently Asked Questions

What is CVE-2022-50285? +

In the Linux kernel, the following vulnerability has been resolved: mm,hugetlb: take hugetlb_lock before decrementing h->resv_huge_pages The h->*_huge_pages counters are protected by the hugetlb_lock, but alloc_huge_page has a corner case where it can decrement the counter outside of the lock. This could lead to a corrupted value of h->resv_huge_pages, which we have observed on our systems. Take the hugetlb_lock before decrementing h->resv_huge_pages to avoid a potential race. It has a CVSS v3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2022-50285? +

CVE-2022-50285 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-2022-50285? +

CVE-2022-50285 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-2022-50285? +

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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