{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-97608","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2026-09-24T16:01:01.158Z","datePublished":"2026-09-25T10:22:19.030Z","dateUpdated":"2026-10-03T11:00:10.846Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-10-03T11:00:10.846Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nf_log: unregister loggers before per-net teardown\n\nnf_log_syslog and nfnetlink_log unregister their per-network namespace\noperations before unregistering their global logger backends. This\nleaves a window where a sysctl or netlink writer can rebind the still-\nregistered logger after the per-net pre-exit callback cleared the old\nselection.\n\nThe race looks like this:\n\n  CPU 0                                 CPU 1\n  ----                                  ----\n  unregister_pernet_subsys()\n    nf_log_unset(net, logger)\n      net->nf.nf_loggers[pf] = NULL\n\n                                        lock nf_log_mutex\n                                        find logger in loggers[][]\n                                        net->nf.nf_loggers[pf] = logger\n                                        unlock nf_log_mutex\n\n  nf_log_unregister(logger)\n    lock nf_log_mutex\n    loggers[pf][type] = NULL\n    unlock nf_log_mutex\n    synchronize_rcu()\n  module exit returns\n  module core frees backend memory\n\nLater, a sysctl read or packet logging operation can dereference the\nstale per-net logger pointer.\n\nFix this by unregistering the global logger backends before tearing down\nper-net state. Once the global registrations are gone, later writers can\nno longer rebind the logger. unregister_pernet_subsys() already waits\nfor an RCU grace period after the pre-exit callback clears the per-net\nselection, while nf_log_unregister() continues to cover readers of the\nglobal logger table.\n\nApply this ordering fix to both nf_log backends that combine per-net\nteardown with global logger registration."}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","value":"AV:L - Both sides of the race are local. One is module exit (nf_log_syslog_exit or nfnetlink_log_fini through delete_module). The other is a write to the net.netfilter.nf_log.<pf> sysctl, handled by nf_log_proc_dostring(), or an NFULNL_CFG_CMD_PF_BIND message over nfnetlink. No remote peer supplies anything that causes the stale nf_loggers[] pointer.\nAC:H - The attacker controls the rebind side, but the other side is a module unload that needs init-namespace CAP_SYS_MODULE. The attacker cannot make it happen. They must win the short window between nf_log_unset() in the per-net pre-exit and nf_log_unregister() while an admin unloads the module.\nPR:L - nf_log_proc_dostring() rebinds net->nf.nf_loggers[pf] from the per-netns sysctl, which is writable in a non-init netns. The nfnetlink PF_BIND path only checks netlink_net_capable(CAP_NET_ADMIN). So user namespaces (unshare -Urn) are enough for the attacker's side.\nUI:N - No victim action on attacker-supplied content is needed. The module unload is an admin action outside the attacker's control and is already counted under AC:H.\nS:U - The stale logger pointer is used inside the same kernel. Nothing crosses a VM, IOMMU or other security boundary.\nC:H - After the module is freed, a sysctl read dereferences logger->name, and nf_log_packet() calls logger->logfn through the dangling nf_loggers[pf] pointer. This is a use-after-free of freed module memory that can be leveraged to disclose kernel memory.\nI:H - nf_log_packet() makes an indirect call through logger->logfn in the freed module's memory. If that memory is reused, this gives control-flow hijacking and memory corruption.\nA:H - Logging a packet, or reading the sysctl, after the logger module is gone faults on the unmapped or reused module memory and oopses the kernel."}]}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/netfilter/nf_log_syslog.c","net/netfilter/nfnetlink_log.c"],"versions":[{"version":"5b023fc8d8e0997e0b7ea6506d243afd5478c96e","lessThan":"51417230716b73f6aa1dc402b3a56d3382a694dc","status":"affected","versionType":"git"},{"version":"5b023fc8d8e0997e0b7ea6506d243afd5478c96e","lessThan":"b0514ca1ee6f2b708d6c602ea946acdfc6a90e24","status":"affected","versionType":"git"},{"version":"5b023fc8d8e0997e0b7ea6506d243afd5478c96e","lessThan":"90166834b7dc6131aa42b6b14b8b4ed47be97079","status":"affected","versionType":"git"},{"version":"5b023fc8d8e0997e0b7ea6506d243afd5478c96e","lessThan":"eaec35fae8f2052c1878a5c7cc7699d8357d79f2","status":"affected","versionType":"git"},{"version":"5b023fc8d8e0997e0b7ea6506d243afd5478c96e","lessThan":"64803ba0a05791cf9ca874466480e4c4cadaf7ab","status":"affected","versionType":"git"},{"version":"5b023fc8d8e0997e0b7ea6506d243afd5478c96e","lessThan":"dce24f3a146948595bb1b86347f31e20b4975daa","status":"affected","versionType":"git"},{"version":"5b023fc8d8e0997e0b7ea6506d243afd5478c96e","lessThan":"2c018cc4842c33f0c732962e2ab58635e8ae5823","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/netfilter/nf_log_syslog.c","net/netfilter/nfnetlink_log.c"],"versions":[{"version":"3.10","status":"affected"},{"version":"0","lessThan":"3.10","status":"unaffected","versionType":"semver"},{"version":"5.15.222","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"6.1.189","lessThanOrEqual":"6.1.*","status":"unaffected","versionType":"semver"},{"version":"6.6.158","lessThanOrEqual":"6.6.*","status":"unaffected","versionType":"semver"},{"version":"6.12.111","lessThanOrEqual":"6.12.*","status":"unaffected","versionType":"semver"},{"version":"6.18.53","lessThanOrEqual":"6.18.*","status":"unaffected","versionType":"semver"},{"version":"7.2.7","lessThanOrEqual":"7.2.*","status":"unaffected","versionType":"semver"},{"version":"7.3-rc3","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.10","versionEndExcluding":"5.15.222"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.10","versionEndExcluding":"6.1.189"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.10","versionEndExcluding":"6.6.158"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.10","versionEndExcluding":"6.12.111"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.10","versionEndExcluding":"6.18.53"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.10","versionEndExcluding":"7.2.7"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.10","versionEndExcluding":"7.3-rc3"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/51417230716b73f6aa1dc402b3a56d3382a694dc"},{"url":"https://git.kernel.org/stable/c/b0514ca1ee6f2b708d6c602ea946acdfc6a90e24"},{"url":"https://git.kernel.org/stable/c/90166834b7dc6131aa42b6b14b8b4ed47be97079"},{"url":"https://git.kernel.org/stable/c/eaec35fae8f2052c1878a5c7cc7699d8357d79f2"},{"url":"https://git.kernel.org/stable/c/64803ba0a05791cf9ca874466480e4c4cadaf7ab"},{"url":"https://git.kernel.org/stable/c/dce24f3a146948595bb1b86347f31e20b4975daa"},{"url":"https://git.kernel.org/stable/c/2c018cc4842c33f0c732962e2ab58635e8ae5823"}],"title":"netfilter: nf_log: unregister loggers before per-net teardown","x_generator":{"engine":"bippy-1.2.0"}}}}