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.
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
af308b94a2a4a5a27bec9028354c4df444a7c8ba to < 349df61526d2e39decc685d246202e3e284cfe05affectedaf308b94a2a4a5a27bec9028354c4df444a7c8ba to < 55b79b1ae42372012413ce0413181d26679b17efaffectedaf308b94a2a4a5a27bec9028354c4df444a7c8ba to < 5e9ee18b27fde88cb6148202b33916c66693fe82affectedaf308b94a2a4a5a27bec9028354c4df444a7c8ba to < 8767fe4079affa74314d7eb3220e700150289842affectedaf308b94a2a4a5a27bec9028354c4df444a7c8ba to < fda6573a46ad24f35348e024905ee5bdf729797eaffectedaf308b94a2a4a5a27bec9028354c4df444a7c8ba to < 941d7394efda5e054e2d6f3e0dd0f6a9ba19aaa3affectedaf308b94a2a4a5a27bec9028354c4df444a7c8ba to < f9a0e4b61054cde89a2a77845293c726cc07cc43affectedaf308b94a2a4a5a27bec9028354c4df444a7c8ba to < c32b26aaa2f9216520a38b3f4bfeec846eb3eb8aaffected
Linux Linux
Default version status: affected
4.19affected0 to < 4.19unaffected5.10.259 to ≤ 5.10.*unaffected5.15.210 to ≤ 5.15.*unaffected6.1.176 to ≤ 6.1.*unaffected6.6.143 to ≤ 6.6.*unaffected6.12.94 to ≤ 6.12.*unaffected6.18.36 to ≤ 6.18.*unaffected7.0.13 to ≤ 7.0.*unaffected7.1 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/349df61526d2e39decc685d246202e3e284cfe05 ↗
- https://git.kernel.org/stable/c/55b79b1ae42372012413ce0413181d26679b17ef ↗
- https://git.kernel.org/stable/c/5e9ee18b27fde88cb6148202b33916c66693fe82 ↗
- https://git.kernel.org/stable/c/8767fe4079affa74314d7eb3220e700150289842 ↗
- https://git.kernel.org/stable/c/fda6573a46ad24f35348e024905ee5bdf729797e ↗
- https://git.kernel.org/stable/c/941d7394efda5e054e2d6f3e0dd0f6a9ba19aaa3 ↗
- https://git.kernel.org/stable/c/f9a0e4b61054cde89a2a77845293c726cc07cc43 ↗
- https://git.kernel.org/stable/c/c32b26aaa2f9216520a38b3f4bfeec846eb3eb8a ↗
- https://cert-portal.siemens.com/productcert/html/ssa-784472.html ↗