224 lines
11 KiB
JSON
224 lines
11 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-2026-64525",
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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": "2026-07-19T15:36:31.794Z",
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"datePublished": "2026-07-25T09:20:49.256Z",
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"dateUpdated": "2026-10-30T12:27:58.969Z"
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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": "2026-10-30T12:27:58.969Z"
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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\nxfrm: move policy_bydst RCU sync from per-netns .exit to .pre_exit\n\nThe struct pernet_operations docstring in include/net/net_namespace.h\nexplicitly warns against blocking RCU primitives in .exit handlers:\n\n Exit methods using blocking RCU primitives, such as\n synchronize_rcu(), should be implemented via exit_batch.\n [...]\n Please, avoid synchronize_rcu() at all, where it's possible.\n\n Note that a combination of pre_exit() and exit() can\n be used, since a synchronize_rcu() is guaranteed between\n the calls.\n\nxfrm_policy_fini() violates this: it calls synchronize_rcu() before\nfreeing the policy_bydst hash tables (so no RCU reader is mid-\ntraversal at free time), but runs from xfrm_net_ops.exit -- once per\nnamespace -- so a cleanup_net() of N namespaces pays N full RCU\ngrace periods serially.\n\nUse the documented pre_exit/exit split. Move the policy flush (and\nthe workqueue drains it depends on) into a new .pre_exit handler;\nxfrm_policy_fini() then runs in .exit and frees the hash tables\nafter the synchronize_rcu_expedited() that cleanup_net() guarantees\nbetween the two phases. Providing O(1) RCU grace periods per batch\ninstead of O(N).\n\nObserved on Linux 6.18 with a workload doing unshare(CLONE_NEWNET)\nat ~13/sec sustained: cleanup_net() and the netns_wq rescuer kthread\nboth stuck in xfrm_policy_fini()'s synchronize_rcu(), >300k struct\nnet accumulated in the cleanup queue, Percpu in /proc/meminfo climbed\nto 130+ GB on 256-CPU hosts, and memcg OOMs followed. setup_net and\n__put_net counts were balanced, ruling out a refcount leak."
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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/xfrm/xfrm_policy.c"
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],
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"versions": [
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{
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"version": "438b1f668ad58f46ce699bb48e4698a7839e3f9e",
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"lessThan": "bca6386dc08750fc7cdcbc7683473748ba3114b9",
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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": "3733fce2871c9bca9dd18a1a23b1432ea215a094",
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"lessThan": "91cc13978ab0bc6f669139f53e7e613a860d10e0",
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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": "069daad4f2ae9c5c108131995529d5f02392c446",
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"lessThan": "d14ae8ef88c2c6590e107db61b6adce148cec7b3",
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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": "069daad4f2ae9c5c108131995529d5f02392c446",
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"lessThan": "3e52417318473782012b236d0325bf7d2266a597",
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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": "b2faee12538b5b008eaef65a4201eb29cb5cefb3",
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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": "b66920a3348c0f63ba18365248fa21fbf0b3a937",
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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": "33a3149dd81a1e2f52b80ee1e0fc380b39f3d028",
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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": "6.12.83",
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"lessThan": "6.12.93",
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"status": "affected",
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"versionType": "semver"
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},
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{
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"version": "6.18.24",
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"lessThan": "6.18.35",
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"status": "affected",
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"versionType": "semver"
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},
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{
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"version": "6.1.191",
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"lessThan": "6.2",
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"status": "affected",
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"versionType": "semver"
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},
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{
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"version": "6.6.136",
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"lessThan": "6.7",
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"status": "affected",
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"versionType": "semver"
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},
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{
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"version": "6.19.14",
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"lessThan": "6.20",
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"status": "affected",
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"versionType": "semver"
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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/xfrm/xfrm_policy.c"
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],
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"versions": [
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{
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"version": "7.0",
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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": "7.0",
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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": "6.12.93",
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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": "6.18.35",
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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": "7.0.12",
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"lessThanOrEqual": "7.0.*",
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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": "7.1",
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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": "6.12.83",
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"versionEndExcluding": "6.12.93"
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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": "6.18.24",
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"versionEndExcluding": "6.18.35"
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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": "7.0",
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"versionEndExcluding": "7.0.12"
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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": "7.0",
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"versionEndExcluding": "7.1"
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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": "6.1.191"
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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": "6.6.136"
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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": "6.19.14"
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}
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]
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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/bca6386dc08750fc7cdcbc7683473748ba3114b9"
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},
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{
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"url": "https://git.kernel.org/stable/c/91cc13978ab0bc6f669139f53e7e613a860d10e0"
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},
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{
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"url": "https://git.kernel.org/stable/c/d14ae8ef88c2c6590e107db61b6adce148cec7b3"
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},
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{
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"url": "https://git.kernel.org/stable/c/3e52417318473782012b236d0325bf7d2266a597"
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}
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],
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"title": "xfrm: move policy_bydst RCU sync from per-netns .exit to .pre_exit",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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}
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}
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} |