245 lines
14 KiB
JSON
245 lines
14 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2026-97608",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2026-09-24T16:01:01.158Z",
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"datePublished": "2026-09-25T10:22:19.030Z",
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"dateUpdated": "2026-10-19T09:10:12.020Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-10-19T09:10:12.020Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"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."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"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."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"net/netfilter/nf_log_syslog.c",
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"net/netfilter/nfnetlink_log.c"
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],
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"versions": [
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{
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"version": "5b023fc8d8e0997e0b7ea6506d243afd5478c96e",
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"lessThan": "51417230716b73f6aa1dc402b3a56d3382a694dc",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "5b023fc8d8e0997e0b7ea6506d243afd5478c96e",
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"lessThan": "b0514ca1ee6f2b708d6c602ea946acdfc6a90e24",
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"status": "affected",
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"versionType": "git"
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},
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{
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"lessThan": "90166834b7dc6131aa42b6b14b8b4ed47be97079",
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"status": "affected",
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},
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{
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"version": "5b023fc8d8e0997e0b7ea6506d243afd5478c96e",
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"lessThan": "eaec35fae8f2052c1878a5c7cc7699d8357d79f2",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "5b023fc8d8e0997e0b7ea6506d243afd5478c96e",
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"lessThan": "64803ba0a05791cf9ca874466480e4c4cadaf7ab",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "5b023fc8d8e0997e0b7ea6506d243afd5478c96e",
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"lessThan": "dce24f3a146948595bb1b86347f31e20b4975daa",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "5b023fc8d8e0997e0b7ea6506d243afd5478c96e",
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"lessThan": "2c018cc4842c33f0c732962e2ab58635e8ae5823",
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"status": "affected",
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"versionType": "git"
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"net/netfilter/nf_log_syslog.c",
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"net/netfilter/nfnetlink_log.c"
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],
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"versions": [
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{
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"version": "3.10",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "3.10",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.15.222",
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"lessThanOrEqual": "5.15.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.1.189",
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"lessThanOrEqual": "6.1.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.6.158",
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"lessThanOrEqual": "6.6.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.12.111",
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"lessThanOrEqual": "6.12.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.18.53",
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"lessThanOrEqual": "6.18.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.2.7",
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"lessThanOrEqual": "7.2.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "7.3",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"cpeApplicability": [
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"operator": "OR",
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"negate": false,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "3.10",
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"versionEndExcluding": "5.15.222"
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/51417230716b73f6aa1dc402b3a56d3382a694dc"
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},
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{
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"url": "https://git.kernel.org/stable/c/b0514ca1ee6f2b708d6c602ea946acdfc6a90e24"
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},
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{
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"url": "https://git.kernel.org/stable/c/90166834b7dc6131aa42b6b14b8b4ed47be97079"
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},
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{
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"url": "https://git.kernel.org/stable/c/eaec35fae8f2052c1878a5c7cc7699d8357d79f2"
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},
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{
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"url": "https://git.kernel.org/stable/c/64803ba0a05791cf9ca874466480e4c4cadaf7ab"
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},
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{
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"url": "https://git.kernel.org/stable/c/dce24f3a146948595bb1b86347f31e20b4975daa"
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},
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{
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"url": "https://git.kernel.org/stable/c/2c018cc4842c33f0c732962e2ab58635e8ae5823"
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}
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],
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"title": "netfilter: nf_log: unregister loggers before per-net teardown",
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"x_generator": {
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} |