CVE-2022-50212: linux kernel Use-After-Free — Fix

Description

In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_tables: do not allow CHAIN_ID to refer to another table When doing lookups for chains on the same batch by using its ID, a chain from a different table can be used. If a rule is added to a table but refers to a chain in a different table, it will be linked to the chain in table2, but would have expressions referring to objects in table1. Then, when table1 is removed, the rule will not be removed as its linked to a chain in table2. When expressions in the rule are processed or removed, that will lead to a use-after-free. When looking for chains by ID, use the table that was used for the lookup by name, and only return chains belonging to that same table.

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CVSS v3.1 Score

7.8

HIGH

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

Weakness Type (CWE)

CWE-416 Use After Free

Affected Products

Vendor	Product	Versions
linux	linux_kernel	5.9 — 5.10.137
linux	linux_kernel	5.11 — 5.15.61
linux	linux_kernel	5.16 — 5.18.18
linux	linux_kernel	5.19 — 5.19.2

References

Advisories & Patches

https://git.kernel.org/stable/c/0f49613a213d918af790c1276f79da741968de11 https://git.kernel.org/stable/c/58e863f64ee3d0879297e5e53b646e4b91e59620 https://git.kernel.org/stable/c/91501513016903077f91033fa5d2aa26cac399b2 https://git.kernel.org/stable/c/95f466d22364a33d183509629d0879885b4f547e https://git.kernel.org/stable/c/9e7dcb88ec8e85e4a8ad0ea494ea2f90f32d2583

Frequently Asked Questions

What is CVE-2022-50212? +

In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_tables: do not allow CHAIN_ID to refer to another table When doing lookups for chains on the same batch by using its ID, a chain from a different table can be used. If a rule is added to a table but refers to a chain in a different table, it will be linked to the chain in table2, but would have expressions referring to objects in table1. Then, when table1 is removed, the rule will not be removed as its linked to a chain in table2. When expressions in the rule are processed or removed, that will lead to a use-after-free. When looking for chains by ID, use the table that was used for the lookup by name, and only return chains belonging to that same table. It has a CVSS v3.1 base score of 7.8 (HIGH).

How severe is CVE-2022-50212? +

CVE-2022-50212 has a CVSS v3.1 score of 7.8 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.

What products are affected by CVE-2022-50212? +

CVE-2022-50212 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-2022-50212? +

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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