289 lines
16 KiB
JSON
289 lines
16 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-2026-23209",
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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": "2026-01-13T15:37:45.986Z",
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"datePublished": "2026-02-14T16:27:31.175Z",
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"dateUpdated": "2026-10-19T18:35:38.702Z"
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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": "2026-08-05T12:20:40.203Z"
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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\nmacvlan: fix error recovery in macvlan_common_newlink()\n\nvalis provided a nice repro to crash the kernel:\n\nip link add p1 type veth peer p2\nip link set address 00:00:00:00:00:20 dev p1\nip link set up dev p1\nip link set up dev p2\n\nip link add mv0 link p2 type macvlan mode source\nip link add invalid% link p2 type macvlan mode source macaddr add 00:00:00:00:00:20\n\nping -c1 -I p1 1.2.3.4\n\nHe also gave a very detailed analysis:\n\n<quote valis>\n\nThe issue is triggered when a new macvlan link is created with\nMACVLAN_MODE_SOURCE mode and MACVLAN_MACADDR_ADD (or\nMACVLAN_MACADDR_SET) parameter, lower device already has a macvlan\nport and register_netdevice() called from macvlan_common_newlink()\nfails (e.g. because of the invalid link name).\n\nIn this case macvlan_hash_add_source is called from\nmacvlan_change_sources() / macvlan_common_newlink():\n\nThis adds a reference to vlan to the port's vlan_source_hash using\nmacvlan_source_entry.\n\nvlan is a pointer to the priv data of the link that is being created.\n\nWhen register_netdevice() fails, the error is returned from\nmacvlan_newlink() to rtnl_newlink_create():\n\n if (ops->newlink)\n err = ops->newlink(dev, ¶ms, extack);\n else\n err = register_netdevice(dev);\n if (err < 0) {\n free_netdev(dev);\n goto out;\n }\n\nand free_netdev() is called, causing a kvfree() on the struct\nnet_device that is still referenced in the source entry attached to\nthe lower device's macvlan port.\n\nNow all packets sent on the macvlan port with a matching source mac\naddress will trigger a use-after-free in macvlan_forward_source().\n\n</quote valis>\n\nWith all that, my fix is to make sure we call macvlan_flush_sources()\nregardless of @create value whenever \"goto destroy_macvlan_port;\"\npath is taken.\n\nMany thanks to valis for following up on this issue."
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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 - Triggering the vulnerability requires CAP_NET_ADMIN to create macvlan interfaces, which is reachable via user namespaces (unshare -Urn) by an unprivileged local user. The setup is local even though the UAF is triggered by network packets.\nAC:L - The vulnerability is deterministically triggered by a straightforward sequence: create a macvlan source with a known-bad interface name to cause register_netdevice() failure, then send a packet with the matching source MAC. No race condition or special conditions needed.\nPR:L - Requires CAP_NET_ADMIN for RTM_NEWLINK netlink operations, but this capability is obtainable by any unprivileged user through user namespaces (unshare -Urn), as netlink_net_capable checks against the network namespace's user_ns, not init_user_ns.\nUI:N - No user interaction is needed. The attacker sets up the vulnerable macvlan configuration and triggers the UAF by sending packets on the lower device, all without any victim action.\nS:U - The vulnerability operates within the kernel's security context. While it allows kernel code execution, it does not cross a virtualization or sandbox boundary — it is standard kernel privilege escalation.\nC:H - The use-after-free in macvlan_forward_source() dereferences a freed macvlan_dev structure. An attacker can reclaim the freed memory via heap spraying, enabling arbitrary kernel memory reads through controlled object contents.\nI:H - The UAF accesses and writes to the freed macvlan_dev structure (e.g., macvlan_count_rx updates statistics). With heap spraying to reclaim the freed object, this provides arbitrary write primitives that can be leveraged for code execution.\nA:H - The use-after-free causes dereferencing of freed memory, which reliably causes kernel crashes (oops/panic) when the freed memory is reclaimed for other purposes. The reproducer in the commit message demonstrates a reliable crash."
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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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"drivers/net/macvlan.c"
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],
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"versions": [
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{
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"version": "aa5fd0fb77486b8a6764ead8627baa14790e4280",
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"lessThan": "da5c6b8ae47e414be47e5e04def15b25d5c962dc",
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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": "aa5fd0fb77486b8a6764ead8627baa14790e4280",
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"lessThan": "5dae6b36a7cb7a4fcf4121b95e9ca7f96f816c8a",
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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": "aa5fd0fb77486b8a6764ead8627baa14790e4280",
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"lessThan": "c43d0e787cbba569ec9d11579ed370b50fab6c9c",
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"status": "affected",
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},
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{
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"version": "aa5fd0fb77486b8a6764ead8627baa14790e4280",
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"lessThan": "11ba9f0dc865136174cb98834280fb21bbc950c7",
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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": "aa5fd0fb77486b8a6764ead8627baa14790e4280",
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"lessThan": "986967a162142710076782d5b93daab93a892980",
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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": "aa5fd0fb77486b8a6764ead8627baa14790e4280",
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"lessThan": "cdedcd5aa3f3cb8b7ae0f87ab3a936d0bd583d66",
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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": "aa5fd0fb77486b8a6764ead8627baa14790e4280",
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"lessThan": "f8db6475a83649689c087a8f52486fcc53e627e9",
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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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"drivers/net/macvlan.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": "5.10.250",
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"lessThanOrEqual": "5.10.*",
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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": "5.15.200",
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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": "6.1.163",
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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": "6.6.124",
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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": "6.12.70",
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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": "6.18.10",
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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",
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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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"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": "5.10.250"
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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/da5c6b8ae47e414be47e5e04def15b25d5c962dc"
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},
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{
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"url": "https://git.kernel.org/stable/c/5dae6b36a7cb7a4fcf4121b95e9ca7f96f816c8a"
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},
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{
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"url": "https://git.kernel.org/stable/c/c43d0e787cbba569ec9d11579ed370b50fab6c9c"
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},
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{
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"url": "https://git.kernel.org/stable/c/11ba9f0dc865136174cb98834280fb21bbc950c7"
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},
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{
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"url": "https://git.kernel.org/stable/c/986967a162142710076782d5b93daab93a892980"
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},
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{
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"url": "https://git.kernel.org/stable/c/cdedcd5aa3f3cb8b7ae0f87ab3a936d0bd583d66"
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},
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{
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"url": "https://git.kernel.org/stable/c/f8db6475a83649689c087a8f52486fcc53e627e9"
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}
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],
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"title": "macvlan: fix error recovery in macvlan_common_newlink()",
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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-2026-23209",
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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": "2026-06-16T20:31:00.910619Z"
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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": "2026-10-19T18:35:38.702Z"
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}
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}
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]
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}
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} |