CVE-2022-49554: linux kernel — Fix

Description

In the Linux kernel, the following vulnerability has been resolved: zsmalloc: fix races between asynchronous zspage free and page migration The asynchronous zspage free worker tries to lock a zspage's entire page list without defending against page migration. Since pages which haven't yet been locked can concurrently migrate off the zspage page list while lock_zspage() churns away, lock_zspage() can suffer from a few different lethal races. It can lock a page which no longer belongs to the zspage and unsafely dereference page_private(), it can unsafely dereference a torn pointer to the next page (since there's a data race), and it can observe a spurious NULL pointer to the next page and thus not lock all of the zspage's pages (since a single page migration will reconstruct the entire page list, and create_page_chain() unconditionally zeroes out each list pointer in the process). Fix the races by using migrate_read_lock() in lock_zspage() to synchronize with page migration.

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CVSS v3.1 Score

4.7

MEDIUM

CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H

Weakness Type (CWE)

CWE-362 CWE-362

Affected Products

Vendor	Product	Versions
linux	linux_kernel	4.14 — 4.14.282
linux	linux_kernel	4.15 — 4.19.246
linux	linux_kernel	4.20 — 5.4.197
linux	linux_kernel	5.5 — 5.10.120
linux	linux_kernel	5.11 — 5.15.45
linux	linux_kernel	5.16 — 5.17.13
linux	linux_kernel	5.18 — 5.18.2

References

Advisories & Patches

https://git.kernel.org/stable/c/2505a981114dcb715f8977b8433f7540854851d8 https://git.kernel.org/stable/c/3674d8a8dadd03a447dd21069d4dacfc3399b63b https://git.kernel.org/stable/c/3ec459c8810e658401be428d3168eacfc380bdd0 https://git.kernel.org/stable/c/645996efc2ae391246d595832aaa6f9d3cc338c7 https://git.kernel.org/stable/c/8ba7b7c1dad1f6503c541778f31b33f7f62eb966 https://git.kernel.org/stable/c/c5402fb5f71f1a725f1e55d9c6799c0c7bec308f https://git.kernel.org/stable/c/fae05b2314b147a78fbed1dc4c645d9a66313758 https://git.kernel.org/stable/c/fc658c083904427abbf8f18280d517ee2668677c

Frequently Asked Questions

What is CVE-2022-49554? +

In the Linux kernel, the following vulnerability has been resolved: zsmalloc: fix races between asynchronous zspage free and page migration The asynchronous zspage free worker tries to lock a zspage's entire page list without defending against page migration. Since pages which haven't yet been locked can concurrently migrate off the zspage page list while lock_zspage() churns away, lock_zspage() can suffer from a few different lethal races. It can lock a page which no longer belongs to the zspage and unsafely dereference page_private(), it can unsafely dereference a torn pointer to the next page (since there's a data race), and it can observe a spurious NULL pointer to the next page and thus not lock all of the zspage's pages (since a single page migration will reconstruct the entire page list, and create_page_chain() unconditionally zeroes out each list pointer in the process). Fix the races by using migrate_read_lock() in lock_zspage() to synchronize with page migration. It has a CVSS v3.1 base score of 4.7 (MEDIUM).

How severe is CVE-2022-49554? +

CVE-2022-49554 has a CVSS v3.1 score of 4.7 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-2022-49554? +

CVE-2022-49554 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-2022-49554? +

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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CVE-2022-49554