CVE-2023-53619

Description

In the Linux kernel, the following vulnerability has been resolved: netfilter: conntrack: Avoid nf_ct_helper_hash uses after free If nf_conntrack_init_start() fails (for example due to a register_nf_conntrack_bpf() failure), the nf_conntrack_helper_fini() clean-up path frees the nf_ct_helper_hash map. When built with NF_CONNTRACK=y, further netfilter modules (e.g: netfilter_conntrack_ftp) can still be loaded and call nf_conntrack_helpers_register(), independently of whether nf_conntrack initialized correctly. This accesses the nf_ct_helper_hash dangling pointer and causes a uaf, possibly leading to random memory corruption. This patch guards nf_conntrack_helper_register() from accessing a freed or uninitialized nf_ct_helper_hash pointer and fixes possible uses-after-free when loading a conntrack module.

PUBLISHED Reserved 2025-10-07 | Published 2025-10-07 | Updated 2025-10-07 | Assigner Linux

Product status

References

git.kernel.org/...c/4ee69c91cb8f9ca144bc0861969e5a1a3c6152a7

git.kernel.org/...c/00716f25f9697d02a0d9bd622575c7c7321ba3d0

git.kernel.org/...c/61c7a5256543ae7d24cd9d21853d514c8632e1e9

git.kernel.org/...c/8289d422f5e484efe4a565fe18e862ecd621c175

git.kernel.org/...c/6f03ce2f1abcb9f9d0511e3659ca6eb60e39f566

git.kernel.org/...c/05561f822f27b9fa88fa5504ddec34bf38833034

git.kernel.org/...c/fce5cc7cbd4b92f979bf02c9ec5fb69aaeba92d7

git.kernel.org/...c/6eef7a2b933885a17679eb8ed0796ddf0ee5309b

cve.org (CVE-2023-53619)

nvd.nist.gov (CVE-2023-53619)

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