CVE-2023-52923: linux kernel — Fix

Description

In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_tables: adapt set backend to use GC transaction API Use the GC transaction API to replace the old and buggy gc API and the busy mark approach. No set elements are removed from async garbage collection anymore, instead the _DEAD bit is set on so the set element is not visible from lookup path anymore. Async GC enqueues transaction work that might be aborted and retried later. rbtree and pipapo set backends does not set on the _DEAD bit from the sync GC path since this runs in control plane path where mutex is held. In this case, set elements are deactivated, removed and then released via RCU callback, sync GC never fails.

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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	4.1 — 4.19.316
linux	linux_kernel	4.20 — 5.4.262
linux	linux_kernel	5.5 — 5.10.198
linux	linux_kernel	5.11 — 5.15.134
linux	linux_kernel	5.16 — 6.1.56
linux	linux_kernel	6.2 — 6.4.11
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/146c76866795553dbc19998f36718d7986ad302b https://git.kernel.org/stable/c/479a2cf5259347d6a1f658b0f791d27a34908e91 https://git.kernel.org/stable/c/c357648929c8dff891502349769aafb8f0452bc2 https://git.kernel.org/stable/c/cb4d00b563675ba8ff6ef94b077f58d816f68ba3 https://git.kernel.org/stable/c/df650d6a4bf47248261b61ef6b174d7c54034d15 https://git.kernel.org/stable/c/e4d71d6a9c7db93f7bf20c3a0f0659d63d7de681 https://git.kernel.org/stable/c/f6c383b8c31a93752a52697f8430a71dcbc46adf

Frequently Asked Questions

What is CVE-2023-52923? +

In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_tables: adapt set backend to use GC transaction API Use the GC transaction API to replace the old and buggy gc API and the busy mark approach. No set elements are removed from async garbage collection anymore, instead the _DEAD bit is set on so the set element is not visible from lookup path anymore. Async GC enqueues transaction work that might be aborted and retried later. rbtree and pipapo set backends does not set on the _DEAD bit from the sync GC path since this runs in control plane path where mutex is held. In this case, set elements are deactivated, removed and then released via RCU callback, sync GC never fails. It has a CVSS v3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2023-52923? +

CVE-2023-52923 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-2023-52923? +

CVE-2023-52923 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-2023-52923? +

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-2023-52923