CVE-2026-23004 (GCVE-0-2026-23004)
Vulnerability from cvelistv5 – Published: 2026-01-25 14:36 – Updated: 2026-10-30 12:23- CWE-416 - Use After Free
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
78df76a065ae3b5dbcb9a29912adc02f697de498 , < 72f39a3cc78b2c6d780376adf68e3de5355e71f8
(git)
Affected: 78df76a065ae3b5dbcb9a29912adc02f697de498 , < 815db2363e51f0ef416947492d4dac5b7a520f56 (git) Affected: 78df76a065ae3b5dbcb9a29912adc02f697de498 , < f24a52948c95e02facbca2b3b6eb5a225e27eb01 (git) Affected: 78df76a065ae3b5dbcb9a29912adc02f697de498 , < 722de945216144af7cd4d39bdeb936108d2595a7 (git) Affected: 78df76a065ae3b5dbcb9a29912adc02f697de498 , < 9a6f0c4d5796ab89b5a28a890ce542344d58bd69 (git) |
guessed | |
| Linux | Linux |
Affected:
3.6
Unaffected: 0 , < 3.6 (semver) Unaffected: 6.1.191 , ≤ 6.1.* (semver) Unaffected: 6.6.130 , ≤ 6.6.* (semver) Unaffected: 6.12.78 , ≤ 6.12.* (semver) Unaffected: 6.18.7 , ≤ 6.18.* (semver) Unaffected: 6.19 , ≤ * (original_commit_for_fix) |
guessed |
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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-\u003eprev, while the prior write on list-\u003enext went well.\n\nstatic inline void INIT_LIST_HEAD(struct list_head *list)\n{\n\tWRITE_ONCE(list-\u003enext, list); // This went well\n\tWRITE_ONCE(list-\u003eprev, list); // Crash, @list has been freed.\n}\n\nIssue here is that rt6_uncached_list_del() did not attempt to lock\nul-\u003elock, as list_empty(\u0026rt-\u003edst.rt_uncached) returned\ntrue because the WRITE_ONCE(list-\u003enext, 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-\u003edst.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 \u003cTASK\u003e\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 \u003c/TASK\u003e\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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"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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"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-\u003eprev, while the prior write on list-\u003enext went well.\n\nstatic inline void INIT_LIST_HEAD(struct list_head *list)\n{\n\tWRITE_ONCE(list-\u003enext, list); // This went well\n\tWRITE_ONCE(list-\u003eprev, list); // Crash, @list has been freed.\n}\n\nIssue here is that rt6_uncached_list_del() did not attempt to lock\nul-\u003elock, as list_empty(\u0026rt-\u003edst.rt_uncached) returned\ntrue because the WRITE_ONCE(list-\u003enext, 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-\u003edst.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 \u003cTASK\u003e\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 \u003c/TASK\u003e\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---"
}
],
"id": "CVE-2026-23004",
"lastModified": "2026-10-30T13:18:33.260",
"metrics": {
"cvssMetricV31": [
{
"cvssData": {
"attackComplexity": "LOW",
"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 7.8,
"baseSeverity": "HIGH",
"confidentialityImpact": "HIGH",
"integrityImpact": "HIGH",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"exploitabilityScore": 1.8,
"impactScore": 5.9,
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"type": "Secondary"
},
{
"cvssData": {
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"attackVector": "LOCAL",
"availabilityImpact": "HIGH",
"baseScore": 4.7,
"baseSeverity": "MEDIUM",
"confidentialityImpact": "NONE",
"integrityImpact": "NONE",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
"userInteraction": "NONE",
"vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H",
"version": "3.1"
},
"exploitabilityScore": 1.0,
"impactScore": 3.6,
"source": "nvd@nist.gov",
"type": "Primary"
}
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"ssvcV203": [
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"options": [
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"exploitation": "none"
},
{
"automatable": "no"
},
{
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}
],
"role": "CISA Coordinator",
"timestamp": "2026-10-16T15:06:21.887256Z",
"version": "2.0.3"
}
}
]
},
"published": "2026-01-25T15:15:55.273",
"references": [
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
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"url": "https://git.kernel.org/stable/c/722de945216144af7cd4d39bdeb936108d2595a7"
},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"url": "https://git.kernel.org/stable/c/72f39a3cc78b2c6d780376adf68e3de5355e71f8"
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},
{
"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"tags": [
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"url": "https://git.kernel.org/stable/c/f24a52948c95e02facbca2b3b6eb5a225e27eb01"
}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Modified",
"weaknesses": [
{
"description": [
{
"lang": "en",
"value": "CWE-362"
}
],
"source": "nvd@nist.gov",
"type": "Primary"
},
{
"description": [
{
"lang": "en",
"value": "CWE-416"
}
],
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"type": "Secondary"
}
]
}
},
"redhat_vex": {
"aggregate_severity": "Moderate",
"current_release_date": "2026-11-07T03:47:40+00:00",
"cve": "CVE-2026-23004",
"id": "CVE-2026-23004",
"initial_release_date": "2026-01-25T00:00:00+00:00",
"product_status:known_affected": "200",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: dst: fix races in rt6_uncached_list_del() and rt_del_uncached_list()",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-23004.json",
"version": "3"
},
"vulnrichment": {
"containers": {
"adp": [
{
"metrics": [
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"other": {
"content": {
"id": "CVE-2026-23004",
"options": [
{
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{
"Automatable": "no"
},
{
"Technical Impact": "total"
}
],
"role": "CISA Coordinator",
"timestamp": "2026-10-16T15:06:21.887256Z",
"version": "2.0.3"
},
"type": "ssvc"
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}
],
"problemTypes": [
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"descriptions": [
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"description": "CWE-416 Use After Free",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-10-16T15:06:22.559Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
},
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"defaultStatus": "unaffected",
"product": "Linux",
"programFiles": [
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"net/ipv4/route.c",
"net/ipv6/route.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"lessThan": "72f39a3cc78b2c6d780376adf68e3de5355e71f8",
"status": "affected",
"version": "78df76a065ae3b5dbcb9a29912adc02f697de498",
"versionType": "git"
},
{
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"status": "affected",
"version": "78df76a065ae3b5dbcb9a29912adc02f697de498",
"versionType": "git"
},
{
"lessThan": "f24a52948c95e02facbca2b3b6eb5a225e27eb01",
"status": "affected",
"version": "78df76a065ae3b5dbcb9a29912adc02f697de498",
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{
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"status": "affected",
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{
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"status": "affected",
"version": "78df76a065ae3b5dbcb9a29912adc02f697de498",
"versionType": "git"
}
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},
{
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"product": "Linux",
"programFiles": [
"net/core/dst.c",
"net/ipv4/route.c",
"net/ipv6/route.c"
],
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"vendor": "Linux",
"versions": [
{
"status": "affected",
"version": "3.6"
},
{
"lessThan": "3.6",
"status": "unaffected",
"version": "0",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.191",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.130",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.78",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.7",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "6.19",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.1.191",
"versionStartIncluding": "3.6",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.6.130",
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},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.12.78",
"versionStartIncluding": "3.6",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.18.7",
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"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.19",
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"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"descriptions": [
{
"lang": "en",
"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-\u003eprev, while the prior write on list-\u003enext went well.\n\nstatic inline void INIT_LIST_HEAD(struct list_head *list)\n{\n\tWRITE_ONCE(list-\u003enext, list); // This went well\n\tWRITE_ONCE(list-\u003eprev, list); // Crash, @list has been freed.\n}\n\nIssue here is that rt6_uncached_list_del() did not attempt to lock\nul-\u003elock, as list_empty(\u0026rt-\u003edst.rt_uncached) returned\ntrue because the WRITE_ONCE(list-\u003enext, 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-\u003edst.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 \u003cTASK\u003e\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 \u003c/TASK\u003e\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---"
}
],
"metrics": [
{
"cvssV3_1": {
"baseScore": 7.8,
"baseSeverity": "HIGH",
"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
"version": "3.1"
},
"scenarios": [
{
"lang": "en",
"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."
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-10-30T12:23:40.865Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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},
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{
"url": "https://git.kernel.org/stable/c/72f39a3cc78b2c6d780376adf68e3de5355e71f8"
},
{
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},
{
"url": "https://git.kernel.org/stable/c/f24a52948c95e02facbca2b3b6eb5a225e27eb01"
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},
{
"url": "https://git.kernel.org/stable/c/9a6f0c4d5796ab89b5a28a890ce542344d58bd69"
}
],
"title": "dst: fix races in rt6_uncached_list_del() and rt_del_uncached_list()",
"x_generator": {
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},
"cveMetadata": {
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"assignerShortName": "Linux",
"cveId": "CVE-2026-23004",
"datePublished": "2026-01-25T14:36:18.233Z",
"dateReserved": "2026-01-13T15:37:45.939Z",
"dateUpdated": "2026-10-30T12:23:40.865Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
How durations are calculated
Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.
Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.
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The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.