251 lines
16 KiB
JSON
251 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-2026-23004",
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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": "2026-01-13T15:37:45.939Z",
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"datePublished": "2026-01-25T14:36:18.233Z",
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"dateUpdated": "2026-10-30T12:23:40.865Z"
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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": "2026-10-30T12:23:40.865Z"
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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\ndst: fix races in rt6_uncached_list_del() and rt_del_uncached_list()\n\nsyzbot was able to crash the kernel in rt6_uncached_list_flush_dev()\nin an interesting way [1]\n\nCrash happens in list_del_init()/INIT_LIST_HEAD() while writing\nlist->prev, while the prior write on list->next went well.\n\nstatic inline void INIT_LIST_HEAD(struct list_head *list)\n{\n\tWRITE_ONCE(list->next, list); // This went well\n\tWRITE_ONCE(list->prev, list); // Crash, @list has been freed.\n}\n\nIssue here is that rt6_uncached_list_del() did not attempt to lock\nul->lock, as list_empty(&rt->dst.rt_uncached) returned\ntrue because the WRITE_ONCE(list->next, list) happened on the other CPU.\n\nWe might use list_del_init_careful() and list_empty_careful(),\nor make sure rt6_uncached_list_del() always grabs the spinlock\nwhenever rt->dst.rt_uncached_list has been set.\n\nA similar fix is neeed for IPv4.\n\n[1]\n\n BUG: KASAN: slab-use-after-free in INIT_LIST_HEAD include/linux/list.h:46 [inline]\n BUG: KASAN: slab-use-after-free in list_del_init include/linux/list.h:296 [inline]\n BUG: KASAN: slab-use-after-free in rt6_uncached_list_flush_dev net/ipv6/route.c:191 [inline]\n BUG: KASAN: slab-use-after-free in rt6_disable_ip+0x633/0x730 net/ipv6/route.c:5020\nWrite of size 8 at addr ffff8880294cfa78 by task kworker/u8:14/3450\n\nCPU: 0 UID: 0 PID: 3450 Comm: kworker/u8:14 Tainted: G L syzkaller #0 PREEMPT_{RT,(full)}\nTainted: [L]=SOFTLOCKUP\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025\nWorkqueue: netns cleanup_net\nCall Trace:\n <TASK>\n dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120\n print_address_description mm/kasan/report.c:378 [inline]\n print_report+0xca/0x240 mm/kasan/report.c:482\n kasan_report+0x118/0x150 mm/kasan/report.c:595\n INIT_LIST_HEAD include/linux/list.h:46 [inline]\n list_del_init include/linux/list.h:296 [inline]\n rt6_uncached_list_flush_dev net/ipv6/route.c:191 [inline]\n rt6_disable_ip+0x633/0x730 net/ipv6/route.c:5020\n addrconf_ifdown+0x143/0x18a0 net/ipv6/addrconf.c:3853\n addrconf_notify+0x1bc/0x1050 net/ipv6/addrconf.c:-1\n notifier_call_chain+0x19d/0x3a0 kernel/notifier.c:85\n call_netdevice_notifiers_extack net/core/dev.c:2268 [inline]\n call_netdevice_notifiers net/core/dev.c:2282 [inline]\n netif_close_many+0x29c/0x410 net/core/dev.c:1785\n unregister_netdevice_many_notify+0xb50/0x2330 net/core/dev.c:12353\n ops_exit_rtnl_list net/core/net_namespace.c:187 [inline]\n ops_undo_list+0x3dc/0x990 net/core/net_namespace.c:248\n cleanup_net+0x4de/0x7b0 net/core/net_namespace.c:696\n process_one_work kernel/workqueue.c:3257 [inline]\n process_scheduled_works+0xad1/0x1770 kernel/workqueue.c:3340\n worker_thread+0x8a0/0xda0 kernel/workqueue.c:3421\n kthread+0x711/0x8a0 kernel/kthread.c:463\n ret_from_fork+0x510/0xa50 arch/x86/kernel/process.c:158\n ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246\n </TASK>\n\nAllocated by task 803:\n kasan_save_stack mm/kasan/common.c:57 [inline]\n kasan_save_track+0x3e/0x80 mm/kasan/common.c:78\n unpoison_slab_object mm/kasan/common.c:340 [inline]\n __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:366\n kasan_slab_alloc include/linux/kasan.h:253 [inline]\n slab_post_alloc_hook mm/slub.c:4953 [inline]\n slab_alloc_node mm/slub.c:5263 [inline]\n kmem_cache_alloc_noprof+0x18d/0x6c0 mm/slub.c:5270\n dst_alloc+0x105/0x170 net/core/dst.c:89\n ip6_dst_alloc net/ipv6/route.c:342 [inline]\n icmp6_dst_alloc+0x75/0x460 net/ipv6/route.c:3333\n mld_sendpack+0x683/0xe60 net/ipv6/mcast.c:1844\n mld_send_cr net/ipv6/mcast.c:2154 [inline]\n mld_ifc_work+0x83e/0xd60 net/ipv6/mcast.c:2693\n process_one_work kernel/workqueue.c:3257 [inline]\n process_scheduled_works+0xad1/0x1770 kernel/workqueue.c:3340\n worker_thread+0x8a0/0xda0 kernel/workqueue.c:3421\n kthread+0x711/0x8a0 kernel/kthread.c:463\n ret_from_fork+0x510/0xa50 arch/x86/kernel/process.c:158\n ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entr\n---truncated---"
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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 IPv4/IPv6 dst uncached-list paths are reachable through local network namespace operations and local packet/socket activity rather than unauthenticated remote packets alone. A local attacker can use user namespaces to obtain CAP_NET_ADMIN in a new network namespace and drive route creation plus device/netns teardown.\nAC:L - The bug is a race, but the attacker can plausibly control both sides by repeatedly creating/freeing uncached dst objects and concurrently tearing down devices or network namespaces. No rare external condition is required beyond normal kernel scheduling.\nPR:L - The relevant device and route teardown paths require CAP_NET_ADMIN, but rtnetlink checks it against the target network namespace user_ns. An unprivileged local user can obtain those capabilities in a user-created network namespace on systems allowing user namespaces.\nUI:N - Exploitation does not require a victim user to open a file, mount anything, or perform an action. The attacker can trigger the route allocation/free and teardown sequence directly.\nS:U - The corruption occurs inside the host kernel networking stack and impacts resources governed by the same kernel security authority. It is not a guest-to-host escape or other cross-scope boundary bypass.\nC:H - This is a slab use-after-free involving dst/route objects, and kernel UAF memory corruption can be leveraged with heap shaping for disclosure primitives. When uncertain, the higher severity confidentiality impact is appropriate.\nI:H - The race causes a write through list_del_init into freed route memory, creating kernel heap corruption. Such UAF writes are plausibly exploitable for arbitrary write or control-flow corruption, so integrity impact is high.\nA:H - The upstream report demonstrates a KASAN slab-use-after-free crash in rt6_uncached_list_flush_dev during netns cleanup. Repeated triggering can crash or destabilize the kernel."
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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/core/dst.c",
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"net/ipv4/route.c",
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"net/ipv6/route.c"
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],
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"versions": [
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{
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"version": "78df76a065ae3b5dbcb9a29912adc02f697de498",
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"lessThan": "72f39a3cc78b2c6d780376adf68e3de5355e71f8",
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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": "78df76a065ae3b5dbcb9a29912adc02f697de498",
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"lessThan": "815db2363e51f0ef416947492d4dac5b7a520f56",
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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": "78df76a065ae3b5dbcb9a29912adc02f697de498",
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"lessThan": "f24a52948c95e02facbca2b3b6eb5a225e27eb01",
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"status": "affected",
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},
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{
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"version": "78df76a065ae3b5dbcb9a29912adc02f697de498",
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"lessThan": "722de945216144af7cd4d39bdeb936108d2595a7",
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"status": "affected",
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},
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{
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"version": "78df76a065ae3b5dbcb9a29912adc02f697de498",
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"lessThan": "9a6f0c4d5796ab89b5a28a890ce542344d58bd69",
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"status": "affected",
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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/core/dst.c",
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"net/ipv4/route.c",
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"net/ipv6/route.c"
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],
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"versions": [
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{
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"version": "3.6",
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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": "3.6",
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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": "6.1.191",
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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": "6.6.130",
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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": "6.12.78",
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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": "6.18.7",
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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": "3.6",
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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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"versionStartIncluding": "3.6",
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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": "3.6",
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"versionEndExcluding": "6.12.78"
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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": "3.6",
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"versionEndExcluding": "6.18.7"
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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": "3.6",
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"versionEndExcluding": "6.19"
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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/72f39a3cc78b2c6d780376adf68e3de5355e71f8"
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},
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{
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"url": "https://git.kernel.org/stable/c/815db2363e51f0ef416947492d4dac5b7a520f56"
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},
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{
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"url": "https://git.kernel.org/stable/c/f24a52948c95e02facbca2b3b6eb5a225e27eb01"
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},
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{
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"url": "https://git.kernel.org/stable/c/722de945216144af7cd4d39bdeb936108d2595a7"
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},
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{
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"url": "https://git.kernel.org/stable/c/9a6f0c4d5796ab89b5a28a890ce542344d58bd69"
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}
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],
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"title": "dst: fix races in rt6_uncached_list_del() and rt_del_uncached_list()",
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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-2026-23004",
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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": "2026-10-16T15:06:21.887256Z"
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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": "2026-10-19T18:25:27.524Z"
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}
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}
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]
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}
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} |