netfilter: nf_log: unregister loggers before per-net teardown

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-97608
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-25 11:17:14 UTC
Updated2026-09-25 11:17:14 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: netfilter: nf_log: unregister loggers before per-net teardown nf_log_syslog and nfnetlink_log unregister their per-network namespace operations before unregistering their global logger backends. This leaves a window where a sysctl or netlink writer can rebind the still- registered logger after the per-net pre-exit callback cleared the old selection. The race looks like this: CPU 0 CPU 1 ---- ---- unregister_pernet_subsys() nf_log_unset(net, logger) net->nf.nf_loggers[pf] = NULL lock nf_log_mutex find logger in loggers[][] net->nf.nf_loggers[pf] = logger unlock nf_log_mutex nf_log_unregister(logger) lock nf_log_mutex loggers[pf][type] = NULL unlock nf_log_mutex synchronize_rcu() module exit returns module core frees backend memory Later, a sysctl read or packet logging operation can dereference the stale per-net logger pointer. Fix this by unregistering the global logger backends before tearing down per-net state. Once the global registrations are gone, later writers can no longer rebind the logger. unregister_pernet_subsys() already waits for an RCU grace period after the pre-exit callback clears the per-net selection, while nf_log_unregister() continues to cover readers of the global logger table. Apply this ordering fix to both nf_log backends that combine per-net teardown with global logger registration.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 5b023fc8d8e0997e0b7ea6506d243afd5478c96e eaec35fae8f2052c1878a5c7cc7699d8357d79f2 git Not specified
CNA Linux Linux affected 5b023fc8d8e0997e0b7ea6506d243afd5478c96e 64803ba0a05791cf9ca874466480e4c4cadaf7ab git Not specified
CNA Linux Linux affected 5b023fc8d8e0997e0b7ea6506d243afd5478c96e dce24f3a146948595bb1b86347f31e20b4975daa git Not specified
CNA Linux Linux affected 5b023fc8d8e0997e0b7ea6506d243afd5478c96e 2c018cc4842c33f0c732962e2ab58635e8ae5823 git Not specified
CNA Linux Linux affected 3.10 Not specified
CNA Linux Linux unaffected 3.10 semver Not specified
CNA Linux Linux unaffected 6.12.111 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.53 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.7 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc3 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/dce24f3a146948595bb1b86347f31e20b4975daa 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/2c018cc4842c33f0c732962e2ab58635e8ae5823 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/eaec35fae8f2052c1878a5c7cc7699d8357d79f2 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/64803ba0a05791cf9ca874466480e4c4cadaf7ab 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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