netfilter: nft_tunnel: fix use-after-free on object destroy

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Summary

CVECVE-2026-53212
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-25 09:16:38 UTC
Updated2026-06-25 09:16:38 UTC
DescriptionIn 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.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected af308b94a2a4a5a27bec9028354c4df444a7c8ba 349df61526d2e39decc685d246202e3e284cfe05 git Not specified
CNA Linux Linux affected af308b94a2a4a5a27bec9028354c4df444a7c8ba 55b79b1ae42372012413ce0413181d26679b17ef git Not specified
CNA Linux Linux affected af308b94a2a4a5a27bec9028354c4df444a7c8ba 5e9ee18b27fde88cb6148202b33916c66693fe82 git Not specified
CNA Linux Linux affected af308b94a2a4a5a27bec9028354c4df444a7c8ba 8767fe4079affa74314d7eb3220e700150289842 git Not specified
CNA Linux Linux affected af308b94a2a4a5a27bec9028354c4df444a7c8ba fda6573a46ad24f35348e024905ee5bdf729797e git Not specified
CNA Linux Linux affected af308b94a2a4a5a27bec9028354c4df444a7c8ba 941d7394efda5e054e2d6f3e0dd0f6a9ba19aaa3 git Not specified
CNA Linux Linux affected af308b94a2a4a5a27bec9028354c4df444a7c8ba f9a0e4b61054cde89a2a77845293c726cc07cc43 git Not specified
CNA Linux Linux affected af308b94a2a4a5a27bec9028354c4df444a7c8ba c32b26aaa2f9216520a38b3f4bfeec846eb3eb8a git Not specified
CNA Linux Linux affected 4.19 Not specified
CNA Linux Linux unaffected 4.19 semver Not specified
CNA Linux Linux unaffected 5.10.259 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.210 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.176 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.143 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.94 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.36 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.13 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/c32b26aaa2f9216520a38b3f4bfeec846eb3eb8a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f9a0e4b61054cde89a2a77845293c726cc07cc43 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/8767fe4079affa74314d7eb3220e700150289842 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/349df61526d2e39decc685d246202e3e284cfe05 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/5e9ee18b27fde88cb6148202b33916c66693fe82 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/55b79b1ae42372012413ce0413181d26679b17ef 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/941d7394efda5e054e2d6f3e0dd0f6a9ba19aaa3 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/fda6573a46ad24f35348e024905ee5bdf729797e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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