UBUNTU-CVE-2026-53212
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.
02 / AFFECTED SOFTWARE
Affected packages
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20 explicit affected versions
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03 / CONNECTIONS
Connected vulnerabilities
04 / EVIDENCE
Source records
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.
05 / REFERENCES
Further evidence
- https://git.kernel.org/linus/c32b26aaa2f9216520a38b3f4bfeec846eb3eb8a
- 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/941d7394efda5e054e2d6f3e0dd0f6a9ba19aaa3
- https://git.kernel.org/stable/c/c32b26aaa2f9216520a38b3f4bfeec846eb3eb8a
- https://git.kernel.org/stable/c/f9a0e4b61054cde89a2a77845293c726cc07cc43
- https://git.kernel.org/stable/c/fda6573a46ad24f35348e024905ee5bdf729797e
- https://ubuntu.com/security/CVE-2026-53212
- https://ubuntu.com/security/notices/USN-8629-1
- https://ubuntu.com/security/notices/USN-8629-2
- https://ubuntu.com/security/notices/USN-8629-3
- https://ubuntu.com/security/notices/USN-8630-1
- https://ubuntu.com/security/notices/USN-8630-2
- https://ubuntu.com/security/notices/USN-8630-3
- https://ubuntu.com/security/notices/USN-8631-1
- https://ubuntu.com/security/notices/USN-8631-2
- https://ubuntu.com/security/notices/USN-8631-3
- https://ubuntu.com/security/notices/USN-8631-4
- https://ubuntu.com/security/notices/USN-8636-1
- https://ubuntu.com/security/notices/USN-8636-2
- https://ubuntu.com/security/notices/USN-8637-1
- https://www.cve.org/CVERecord?id=CVE-2026-53212