224 lines
12 KiB
JSON
224 lines
12 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-2026-93288",
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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": "2026-09-17T16:02:15.099Z",
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"datePublished": "2026-09-24T16:02:12.144Z",
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"dateUpdated": "2026-10-03T10:57:14.695Z"
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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": "2026-10-03T10:57:14.695Z"
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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: nfnetlink_log: wait for rcu grace period before freeing pernet state\n\nsashiko reports: \"nfnl_log_net_exit() calls nf_log_unset(), which\nclears the logger pointer without an RCU grace period. Immediately after,\nops_free_list() frees the per-net state while concurrent packets might\nstill be executing nf_log_packet() under rcu_read_lock().\"\n\nClear the pointer via .pre_exit to make sure rcu readers have completed\nbefore pernet storage is free'd. The change in nf_log_syslog.c is only\ndone for consistency: it doesn't use pernet data."
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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:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7.8,
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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 - The UAF is in nfnl_log_net_exit() (unset moved to nfnl_log_net_pre_exit): cleanup_net() frees nfnl_log_net via ops_free_list() while nf_log_packet()→nfulnl_log_packet() still uses nfnl_log_pernet(). Setup is local NETLINK_NETFILTER nfulnl_recv_config (NFULNL_CFG_CMD_PF_BIND); no remote protocol message carries the bug.\nAC:L - The attacker PF_BINDs nfulnl_logger through nfulnl_recv_config, generates packets that enter nf_log_packet() (conntrack nf_l4proto_log_invalid() while those hooks still exist, or NFLOG), and drops the netns so cleanup_net() races nfnl_log_net_exit()/ops_free_list() against that reader; both sides are attacker-controlled.\nPR:L - nfnetlink_rcv() requires CAP_NET_ADMIN via netlink_net_capable() in sock_net(skb->sk)->user_ns before nfulnl_recv_config can bind the logger; an unprivileged user obtains that capability in a user+net namespace (unshare -Urn).\nUI:N - The attacker issues nfulnl_recv_config, injects the logged packets, and destroys their own netns; no victim mount, file open, or other interaction is required.\nS:U - The slab UAF of struct nfnl_log_net inside nfulnl_log_packet()/instance_lookup_get_rcu() is host-kernel memory corruption in the same kernel authority, not a VM escape or IOMMU/DMA bypass.\nC:H - After ops_free_list() kfree()s the per-net object, nfulnl_log_packet() still calls nfnl_log_pernet() and instance_lookup_get_rcu() walks the freed instance_table hlist, a slab UAF that can be reclaimed for arbitrary kernel reads.\nI:H - Use-after-free of nfnl_log_net's instance_table and the resulting nfulnl_instance pointer chase (hlist, inst->lock, inst->skb) is a heap UAF write primitive that can hijack control flow.\nA:H - instance_lookup_get_rcu()/nfulnl_log_packet() dereferencing the freed nfnl_log_net can oops or panic the kernel even when the UAF is not turned into a full exploit."
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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": "c83fa19603bdaeef17b815713dbbe3230c8a34ee",
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"lessThan": "ba2e246aa294f9acd86194ea87fb6834ed0a37ac",
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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": "c83fa19603bdaeef17b815713dbbe3230c8a34ee",
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"lessThan": "5570d6c8b320dbcc602617ee08c27ce752fed65a",
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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": "c83fa19603bdaeef17b815713dbbe3230c8a34ee",
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"lessThan": "3b9aa62d78ce80de47af2db472ff452398755213",
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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": "c83fa19603bdaeef17b815713dbbe3230c8a34ee",
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"lessThan": "f4461654374576e9d5d0245fd534c46ad8509051",
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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": "c83fa19603bdaeef17b815713dbbe3230c8a34ee",
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"lessThan": "dc20050b6b12ca58066715d088e1a537535d938d",
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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": "c83fa19603bdaeef17b815713dbbe3230c8a34ee",
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"lessThan": "33d1469b0124cc0baaea7a2032123b77a81e0940",
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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": "4.12",
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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": "4.12",
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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": "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",
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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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{
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "4.12",
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"versionEndExcluding": "5.15.222"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "4.12",
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"versionEndExcluding": "6.1.189"
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},
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{
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "4.12",
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"versionEndExcluding": "6.6.158"
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}
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]
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}
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/ba2e246aa294f9acd86194ea87fb6834ed0a37ac"
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},
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{
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"url": "https://git.kernel.org/stable/c/5570d6c8b320dbcc602617ee08c27ce752fed65a"
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},
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{
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"url": "https://git.kernel.org/stable/c/3b9aa62d78ce80de47af2db472ff452398755213"
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},
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{
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"url": "https://git.kernel.org/stable/c/f4461654374576e9d5d0245fd534c46ad8509051"
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},
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{
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"url": "https://git.kernel.org/stable/c/dc20050b6b12ca58066715d088e1a537535d938d"
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},
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{
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"url": "https://git.kernel.org/stable/c/33d1469b0124cc0baaea7a2032123b77a81e0940"
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}
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],
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"title": "netfilter: nfnetlink_log: wait for rcu grace period before freeing pernet state",
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"x_generator": {
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} |