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.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
12f7a505331e6b2754684b509f2ac8f0011ce644 to < 4ee69c91cb8f9ca144bc0861969e5a1a3c6152a7affected12f7a505331e6b2754684b509f2ac8f0011ce644 to < 00716f25f9697d02a0d9bd622575c7c7321ba3d0affected12f7a505331e6b2754684b509f2ac8f0011ce644 to < 61c7a5256543ae7d24cd9d21853d514c8632e1e9affected12f7a505331e6b2754684b509f2ac8f0011ce644 to < 8289d422f5e484efe4a565fe18e862ecd621c175affected12f7a505331e6b2754684b509f2ac8f0011ce644 to < 6f03ce2f1abcb9f9d0511e3659ca6eb60e39f566affected12f7a505331e6b2754684b509f2ac8f0011ce644 to < 05561f822f27b9fa88fa5504ddec34bf38833034affected12f7a505331e6b2754684b509f2ac8f0011ce644 to < fce5cc7cbd4b92f979bf02c9ec5fb69aaeba92d7affected12f7a505331e6b2754684b509f2ac8f0011ce644 to < 6eef7a2b933885a17679eb8ed0796ddf0ee5309baffected
Linux Linux
Default version status: affected
3.6affected0 to < 3.6unaffected4.14.322 to ≤ 4.14.*unaffected4.19.291 to ≤ 4.19.*unaffected5.4.251 to ≤ 5.4.*unaffected5.10.188 to ≤ 5.10.*unaffected5.15.121 to ≤ 5.15.*unaffected6.1.39 to ≤ 6.1.*unaffected6.4.4 to ≤ 6.4.*unaffected6.5 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/4ee69c91cb8f9ca144bc0861969e5a1a3c6152a7 ↗
- https://git.kernel.org/stable/c/00716f25f9697d02a0d9bd622575c7c7321ba3d0 ↗
- https://git.kernel.org/stable/c/61c7a5256543ae7d24cd9d21853d514c8632e1e9 ↗
- https://git.kernel.org/stable/c/8289d422f5e484efe4a565fe18e862ecd621c175 ↗
- https://git.kernel.org/stable/c/6f03ce2f1abcb9f9d0511e3659ca6eb60e39f566 ↗
- https://git.kernel.org/stable/c/05561f822f27b9fa88fa5504ddec34bf38833034 ↗
- https://git.kernel.org/stable/c/fce5cc7cbd4b92f979bf02c9ec5fb69aaeba92d7 ↗
- https://git.kernel.org/stable/c/6eef7a2b933885a17679eb8ed0796ddf0ee5309b ↗