netfilter: nf_tables: fix memleak when more than 255 element… (CVE-2023-52581)

Summary

netfilter: nf_tables: fix memleak when more than 255 elements expired

The description as published by the source.

In the Linux kernel, the following vulnerability has been resolved:

netfilter: nf_tables: fix memleak when more than 255 elements expired

When more than 255 elements expired we're supposed to switch to a new gc
container structure.

This never happens: u8 type will wrap before reaching the boundary
and nft_trans_gc_space() always returns true.

This means we recycle the initial gc container structure and
lose track of the elements that came before.

While at it, don't deref 'gc' after we've passed it to call_rcu.

Source: OSV.dev (Open Source Vulnerabilities) NVD OSV

Linux Kernel

[{"type":"ECOSYSTEM","events":[{"introduced":"6.5.0"},{"fixed":"6.5.6"}]}]

Fixed packages published by each distribution for this CVE