netfilter: nat: use kfree_rcu to release ops

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Summary

CVECVE-2026-53000
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-24 17:17:11 UTC
Updated2026-06-24 17:17:11 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: netfilter: nat: use kfree_rcu to release ops Florian Westphal says: "Historically this is not an issue, even for normal base hooks: the data path doesn't use the original nf_hook_ops that are used to register the callbacks. However, in v5.14 I added the ability to dump the active netfilter hooks from userspace. This code will peek back into the nf_hook_ops that are available at the tail of the pointer-array blob used by the datapath. The nat hooks are special, because they are called indirectly from the central nat dispatcher hook. They are currently invisible to the nfnl hook dump subsystem though. But once that changes the nat ops structures have to be deferred too." Update nf_nat_register_fn() to deal with partial exposition of the hooks from error path which can be also an issue for nfnetlink_hook.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected e2cf17d3774c323ef6dab6e9f7c0cfc5e742afd9 32fdd2e38e7435a368d88f5977a7d6585ebc8b0e git Not specified
CNA Linux Linux affected e2cf17d3774c323ef6dab6e9f7c0cfc5e742afd9 3c7511f38ab511b791196b13ae48bf4973bf7dfd git Not specified
CNA Linux Linux affected e2cf17d3774c323ef6dab6e9f7c0cfc5e742afd9 6eda0d771f94267f73f57c94630aa47e90957915 git Not specified
CNA Linux Linux affected 5.14 Not specified
CNA Linux Linux unaffected 5.14 semver Not specified
CNA Linux Linux unaffected 6.18.33 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.10 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/6eda0d771f94267f73f57c94630aa47e90957915 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/3c7511f38ab511b791196b13ae48bf4973bf7dfd 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/32fdd2e38e7435a368d88f5977a7d6585ebc8b0e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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