CVE-2023-53304: linux kernel Null Dereference — Fix

Description

In the Linux kernel, the following vulnerability has been resolved: netfilter: nft_set_rbtree: fix overlap expiration walk The lazy gc on insert that should remove timed-out entries fails to release the other half of the interval, if any. Can be reproduced with tests/shell/testcases/sets/0044interval_overlap_0 in nftables.git and kmemleak enabled kernel. Second bug is the use of rbe_prev vs. prev pointer. If rbe_prev() returns NULL after at least one iteration, rbe_prev points to element that is not an end interval, hence it should not be removed. Lastly, check the genmask of the end interval if this is active in the current generation.

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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	5.10.166 — 5.10.190
linux	linux_kernel	5.15.91 — 5.15.124
linux	linux_kernel	6.1.9 — 6.1.43
linux	linux_kernel	6.2.1 — 6.4.8
linux	linux_kernel	All
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/50cbb9d195c197af671869c8cadce3bd483735a0 https://git.kernel.org/stable/c/8284a79136c384059e85e278da2210b809730287 https://git.kernel.org/stable/c/893cb3c3513cf661a0ff45fe0cfa83fe27131f76 https://git.kernel.org/stable/c/89a4d1a89751a0fbd520e64091873e19cc0979e8 https://git.kernel.org/stable/c/acaee227cf79c45a5d2d49c3e9a66333a462802c https://git.kernel.org/stable/c/cd66733932399475fe933cb3ec03e687ed401462 https://git.kernel.org/stable/c/f718863aca469a109895cb855e6b81fff4827d71

Frequently Asked Questions

What is CVE-2023-53304? +

In the Linux kernel, the following vulnerability has been resolved: netfilter: nft_set_rbtree: fix overlap expiration walk The lazy gc on insert that should remove timed-out entries fails to release the other half of the interval, if any. Can be reproduced with tests/shell/testcases/sets/0044interval_overlap_0 in nftables.git and kmemleak enabled kernel. Second bug is the use of rbe_prev vs. prev pointer. If rbe_prev() returns NULL after at least one iteration, rbe_prev points to element that is not an end interval, hence it should not be removed. Lastly, check the genmask of the end interval if this is active in the current generation. It has a CVSS v3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2023-53304? +

CVE-2023-53304 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-2023-53304? +

CVE-2023-53304 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-2023-53304? +

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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