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netfilter: nft_tunnel: fix use-after-free on object destroy
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.
References
Affected products
Linux
- =<6.18.*
- =<*
- =<6.1.*
- <8767fe4079affa74314d7eb3220e700150289842
- =<6.6.*
- <5e9ee18b27fde88cb6148202b33916c66693fe82
- =<7.0.*
- =<6.12.*
- <941d7394efda5e054e2d6f3e0dd0f6a9ba19aaa3
- <349df61526d2e39decc685d246202e3e284cfe05
- <f9a0e4b61054cde89a2a77845293c726cc07cc43
- <4.19
- ==4.19
- =<5.15.*
- <55b79b1ae42372012413ce0413181d26679b17ef
- <c32b26aaa2f9216520a38b3f4bfeec846eb3eb8a
- =<5.10.*
- <fda6573a46ad24f35348e024905ee5bdf729797e