268 lines
13 KiB
JSON
268 lines
13 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-2026-43091",
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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": "2026-05-01T14:12:55.984Z",
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"datePublished": "2026-05-06T07:40:23.955Z",
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"dateUpdated": "2026-10-30T12:24:55.188Z"
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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": "2026-10-30T12:24:55.188Z"
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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: Wait for RCU readers during policy netns exit\n\nxfrm_policy_fini() frees the policy_bydst hash tables after flushing the\npolicy work items and deleting all policies, but it does not wait for\nconcurrent RCU readers to leave their read-side critical sections first.\n\nThe policy_bydst tables are published via rcu_assign_pointer() and are\nlooked up through rcu_dereference_check(), so netns teardown must also\nwait for an RCU grace period before freeing the table memory.\n\nFix this by adding synchronize_rcu() before freeing the policy hash tables."
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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 vulnerable path requires local control of a network namespace/XFRM policy state and concurrent namespace teardown; remote packets can exercise XFRM policy lookups, but a remote attacker cannot normally trigger the required netns exit.\nAC:L - The race is attacker-controllable by creating XFRM policies, generating policy lookups, and tearing down the namespace concurrently; no rare configuration or victim-controlled timing is required beyond winning a repeatable local race.\nPR:L - XFRM netlink operations require CAP_NET_ADMIN in the target network namespace, but an unprivileged local user can obtain that in a new user+network namespace on common userns-enabled systems.\nUI:N - No victim action is required once the local attacker can run code and issue the relevant namespace, netlink, and traffic operations.\nS:U - The impact is within the kernel security authority; this is a standard kernel memory-safety issue rather than a VM, IOMMU, or separate-scope escape.\nC:H - This is a use-after-free of an RCU-published XFRM policy hash table, and stale readers may dereference reallocated attacker-influenced memory during policy lookup.\nI:H - As a kernel UAF in a list traversal path that can reach policy object handling, the freed memory can plausibly be shaped into fake list/policy data and leveraged for kernel memory corruption.\nA:H - At minimum, dereferencing freed hash-table memory during packet or route policy lookup can trigger a kernel oops or panic, causing high availability impact."
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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/xfrm/xfrm_policy.c"
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],
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"versions": [
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{
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"version": "e1e551bc56302b80ff930c966f9985095fb1b70d",
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"lessThan": "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": "e1e551bc56302b80ff930c966f9985095fb1b70d",
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"lessThan": "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": "e1e551bc56302b80ff930c966f9985095fb1b70d",
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"lessThan": "438b1f668ad58f46ce699bb48e4698a7839e3f9e",
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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": "e1e551bc56302b80ff930c966f9985095fb1b70d",
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"lessThan": "3733fce2871c9bca9dd18a1a23b1432ea215a094",
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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": "e1e551bc56302b80ff930c966f9985095fb1b70d",
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"lessThan": "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": "e1e551bc56302b80ff930c966f9985095fb1b70d",
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"lessThan": "069daad4f2ae9c5c108131995529d5f02392c446",
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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/xfrm/xfrm_policy.c"
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],
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"versions": [
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{
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"version": "4.9",
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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": "4.9",
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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": "6.1.191",
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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": "6.6.136",
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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": "6.12.83",
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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": "6.18.24",
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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": "6.19.14",
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"lessThanOrEqual": "6.19.*",
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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",
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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": "4.9",
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"versionEndExcluding": "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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}
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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/b2faee12538b5b008eaef65a4201eb29cb5cefb3"
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},
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{
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"url": "https://git.kernel.org/stable/c/b66920a3348c0f63ba18365248fa21fbf0b3a937"
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},
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{
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"url": "https://git.kernel.org/stable/c/438b1f668ad58f46ce699bb48e4698a7839e3f9e"
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},
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{
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"url": "https://git.kernel.org/stable/c/3733fce2871c9bca9dd18a1a23b1432ea215a094"
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},
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{
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"url": "https://git.kernel.org/stable/c/33a3149dd81a1e2f52b80ee1e0fc380b39f3d028"
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},
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{
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"url": "https://git.kernel.org/stable/c/069daad4f2ae9c5c108131995529d5f02392c446"
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}
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],
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"title": "xfrm: Wait for RCU readers during policy netns 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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"adp": [
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{
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"metrics": [
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{
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"other": {
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"type": "ssvc",
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"content": {
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"id": "CVE-2026-43091",
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"role": "CISA Coordinator",
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"options": [
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{
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"Exploitation": "none"
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},
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{
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"Automatable": "no"
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},
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{
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"Technical Impact": "total"
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}
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],
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"version": "2.0.3",
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"timestamp": "2026-10-16T15:14:31.928454Z"
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}
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}
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}
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],
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"problemTypes": [
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{
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"descriptions": [
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{
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"lang": "en",
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"type": "CWE",
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"cweId": "CWE-416",
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"description": "CWE-416 Use After Free"
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}
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]
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}
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],
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"title": "CISA ADP Vulnrichment",
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"providerMetadata": {
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"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
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"shortName": "CISA-ADP",
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"dateUpdated": "2026-10-19T19:06:13.331Z"
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}
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}
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]
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}
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} |