298 lines
16 KiB
JSON
298 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-2026-74726",
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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": "2026-08-15T05:44:03.929Z",
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"datePublished": "2026-08-22T15:33:17.128Z",
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"dateUpdated": "2026-10-16T19:16:12.256Z"
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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": "2026-08-25T05:42:07.173Z"
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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\nbonding: alb: re-check primary_is_promisc under RTNL in bond_alb_monitor\n\nbond_alb_monitor() reads primary_is_promisc under RCU, then drops RCU and\ntakes RTNL via rtnl_trylock() before undoing the promiscuity it set on the\nactive slave. In that window the active slave can change under RTNL\n(RTM_DELLINK -> __bond_release_one() -> bond_alb_handle_active_change()),\nwhich already drops the promiscuity and clears primary_is_promisc. The\nmonitor still acts on the stale decision: if the slave was removed with no\nfailover, curr_active_slave is now NULL and the deref faults; if it failed\nover, the stale dev_set_promiscuity(-1) underflows the new slave's\npromiscuity counter and pins it in IFF_PROMISC.\n\n Oops: general protection fault, probably for non-canonical address ...\n KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007]\n Workqueue: b42 bond_alb_monitor\n RIP: 0010:bond_alb_monitor (drivers/net/bonding/bond_alb.c:1600)\n process_one_work (kernel/workqueue.c:3322)\n worker_thread (kernel/workqueue.c:3486)\n kthread (kernel/kthread.c:436)\n ret_from_fork (arch/x86/kernel/process.c:158)\n Kernel panic - not syncing: Fatal exception\n\nRe-check primary_is_promisc (and curr_active_slave) after taking RTNL so\nthe monitor only undoes an increment it still owns. The other bonding\nmonitors already re-read state under RTNL in their commit phase\n(bond_miimon_commit/bond_ab_arp_commit); bond_alb_monitor() was the only\none acting on the pre-trylock decision."
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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:L/A:H",
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"baseScore": 7.3,
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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 - Exploitation requires local RTNL netlink (RTM_DELLINK) or bonding ioctl (SIOCBONDRELEASE) to remove/reconfigure slaves while bond_alb_monitor runs; the bug is in a delayed workqueue, not in packet receive or any remote network protocol path.\nAC:L - An attacker with CAP_NET_ADMIN controls both race sides—timing slave removal/failover against the periodic ALB monitor after primary_is_promisc is set—and can retry rapidly when rtnl_trylock fails, making NULL deref or promiscuity-counter underflow reliably winnable.\nPR:L - Triggering ALB bond setup and slave release requires CAP_NET_ADMIN, which unprivileged users can obtain inside a user+network namespace (unshare -Urn), enabling host-wide kernel panic without init-namespace root on typical distributions.\nUI:N - No victim interaction is required; the attacker programmatically creates an ALB bond, drives primary_is_promisc via slave disable/removal, and races bond_alb_monitor without any other user or administrator action.\nS:U - Impact is confined to kernel networking state and causes host kernel panic or netdev promiscuity corruption; it does not cross VM, container, or IOMMU security boundaries into another security authority.\nC:H - Beyond the NULL-deref crash path, the failover race underflows dev->promiscuity and permanently pins IFF_PROMISC on the new active slave, enabling sustained capture of all traffic on that bonded interface/segment—a broad confidentiality impact on server/cloud HA deployments.\nI:L - The stale dev_set_promiscuity(-1) corrupts the netdev promiscuity counter (unsigned underflow to a huge value), improperly modifying kernel network device state even though it does not provide arbitrary memory write or code-execution primitives.\nA:H - If the active slave is removed without failover, the monitor dereferences a NULL curr_active_slave and panics the kernel, as confirmed by KASAN null-ptr-deref and \"Kernel panic - not syncing: Fatal exception\" in the fix commit."
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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/bonding/bond_alb.c"
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],
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"versions": [
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{
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"version": "d0e81b7e2246a41d068ecaf15aac9de570816d63",
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"lessThan": "f7668762bf5fd6db9397de5c0514407489d9d815",
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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": "d0e81b7e2246a41d068ecaf15aac9de570816d63",
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"lessThan": "09add8d5cfa9c46828f51eaad162c36e86366b71",
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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": "d0e81b7e2246a41d068ecaf15aac9de570816d63",
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"lessThan": "b82f51681a7a88c7d3c865e817a3340d42b5fa2a",
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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": "d0e81b7e2246a41d068ecaf15aac9de570816d63",
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"lessThan": "dd148539fb4741d01c06b7d2c8bd84b01920756c",
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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": "d0e81b7e2246a41d068ecaf15aac9de570816d63",
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"lessThan": "dccec0227ed8d9e36936d66e256b957dc2858468",
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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": "d0e81b7e2246a41d068ecaf15aac9de570816d63",
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"lessThan": "2faf75a8a06504071b4c0aea7e45a9cc49a4e187",
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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": "d0e81b7e2246a41d068ecaf15aac9de570816d63",
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"lessThan": "257c4a3a34d8f51efb00f35375a0c6ce3c8f6ce2",
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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": "d0e81b7e2246a41d068ecaf15aac9de570816d63",
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"lessThan": "683c6ba6e58e6ed1037831ea97dd58d9c0e76b8d",
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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/bonding/bond_alb.c"
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],
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"versions": [
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{
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"version": "2.6.24",
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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": "2.6.24",
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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": "5.10.265",
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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": "5.15.216",
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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": "6.1.183",
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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": "6.6.152",
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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": "6.12.104",
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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": "6.18.45",
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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": "7.1.9",
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"lessThanOrEqual": "7.1.*",
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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": "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": "2.6.24",
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"versionEndExcluding": "5.10.265"
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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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"references": [
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{
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"url": "https://git.kernel.org/stable/c/f7668762bf5fd6db9397de5c0514407489d9d815"
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},
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{
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"url": "https://git.kernel.org/stable/c/09add8d5cfa9c46828f51eaad162c36e86366b71"
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},
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{
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"url": "https://git.kernel.org/stable/c/b82f51681a7a88c7d3c865e817a3340d42b5fa2a"
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},
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{
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"url": "https://git.kernel.org/stable/c/dd148539fb4741d01c06b7d2c8bd84b01920756c"
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},
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{
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"url": "https://git.kernel.org/stable/c/dccec0227ed8d9e36936d66e256b957dc2858468"
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},
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{
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"url": "https://git.kernel.org/stable/c/2faf75a8a06504071b4c0aea7e45a9cc49a4e187"
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},
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{
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"url": "https://git.kernel.org/stable/c/257c4a3a34d8f51efb00f35375a0c6ce3c8f6ce2"
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},
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{
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"url": "https://git.kernel.org/stable/c/683c6ba6e58e6ed1037831ea97dd58d9c0e76b8d"
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}
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],
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"title": "bonding: alb: re-check primary_is_promisc under RTNL in bond_alb_monitor",
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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-2026-74726",
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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": "partial"
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}
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],
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"version": "2.0.3",
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"timestamp": "2026-10-16T19:15:46.761836Z"
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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": "2026-10-16T19:16:12.256Z"
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}
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}
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]
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}
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} |