Description
In the Linux kernel, the following vulnerability has been resolved: netfilter: nft_tunnel: fix use-after-free on object destroy nft_tunnel_obj_destroy() calls metadata_dst_free() which directly kfree()s the metadata_dst, ignoring the dst_entry refcount. Packets that took a reference via dst_hold() in nft_tunnel_obj_eval() and are still queued (e.g. in a netem qdisc) are left with a dangling pointer. When these packets are eventually dequeued, dst_release() operates on freed memory. Replace metadata_dst_free() with dst_release() so the metadata_dst is freed only after all references are dropped. The dst subsystem already handles metadata_dst cleanup in dst_destroy() when DST_METADATA is set.
Product status
af308b94a2a4a5a27bec9028354c4df444a7c8ba (git) before 349df61526d2e39decc685d246202e3e284cfe05
af308b94a2a4a5a27bec9028354c4df444a7c8ba (git) before 55b79b1ae42372012413ce0413181d26679b17ef
af308b94a2a4a5a27bec9028354c4df444a7c8ba (git) before 5e9ee18b27fde88cb6148202b33916c66693fe82
af308b94a2a4a5a27bec9028354c4df444a7c8ba (git) before 8767fe4079affa74314d7eb3220e700150289842
af308b94a2a4a5a27bec9028354c4df444a7c8ba (git) before fda6573a46ad24f35348e024905ee5bdf729797e
af308b94a2a4a5a27bec9028354c4df444a7c8ba (git) before 941d7394efda5e054e2d6f3e0dd0f6a9ba19aaa3
af308b94a2a4a5a27bec9028354c4df444a7c8ba (git) before f9a0e4b61054cde89a2a77845293c726cc07cc43
af308b94a2a4a5a27bec9028354c4df444a7c8ba (git) before c32b26aaa2f9216520a38b3f4bfeec846eb3eb8a
4.19
Any version before 4.19
5.10.259 (semver)
5.15.210 (semver)
6.1.176 (semver)
6.6.143 (semver)
6.12.94 (semver)
6.18.36 (semver)
7.0.13 (semver)
7.1 (original_commit_for_fix)
References
git.kernel.org/...c/349df61526d2e39decc685d246202e3e284cfe05
git.kernel.org/...c/55b79b1ae42372012413ce0413181d26679b17ef
git.kernel.org/...c/5e9ee18b27fde88cb6148202b33916c66693fe82
git.kernel.org/...c/8767fe4079affa74314d7eb3220e700150289842
git.kernel.org/...c/fda6573a46ad24f35348e024905ee5bdf729797e
git.kernel.org/...c/941d7394efda5e054e2d6f3e0dd0f6a9ba19aaa3
git.kernel.org/...c/f9a0e4b61054cde89a2a77845293c726cc07cc43
git.kernel.org/...c/c32b26aaa2f9216520a38b3f4bfeec846eb3eb8a