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Linux CVE-2026-23004

MEDIUM
Race Condition (CWE-362)
2026-01-25 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Denial Of Service Linux Google Race Condition
4.7
CVSS 3.1 · NVD
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Vulnerability Assessment

Weakness
CWE
CWE-362
OWASP Top 10:2025
A06:2025 - Insecure Design
ASVS 5.0
V15 - Secure Coding and Architecture Concurrency control, locking
MITRE ATT&CK

1 technique across 1 tactic: Privilege Escalation

The technique list with ATT&CK links and the kill-chain view is part of the Basic plan and up.

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Exploit ScenarioDerived

An attacker could exploit this vulnerability to compromise the affected system.
This Month Plan within 30 days. Why: MEDIUM severity (CVSS 4.0-6.9).
Patch available 0.0% exploitation probability (EPSS)

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AnalysisAIv1 – Mar 12, 2026

A race condition in Linux kernel routing code allows local authenticated attackers to cause a denial of service by triggering a kernel crash through unsynchronized list operations in rt6_uncached_list_del() and rt_del_uncached_list(). The vulnerability occurs when concurrent CPU operations on list data structures result in use-after-free conditions during list initialization. No patch is currently available for this medium-severity issue.

Earlier versions of this analysis (1)
v1 Mar 12, 2026 - 21:59 CVSS 4.7

In the Linux kernel, the following vulnerability has been resolved:

dst: fix races in rt6_uncached_list_del() and rt_del_uncached_list()

syzbot was able to crash the kernel in rt6_uncached_list_flush_dev() in an interesting way [1]

Crash happens in list_del_init()/INIT_LIST_HEAD() while writing list->prev, while the prior write on list->next went well.

RemediationAI

Monitor vendor advisories for a patch.

Affects your stack

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Technical ContextAI · show details

In the Linux kernel, the following vulnerability has been resolved:

dst: fix races in rt6_uncached_list_del() and rt_del_uncached_list()

syzbot was able to crash the kernel in rt6_uncached_list_flush_dev() in an interesting way [1]

Crash happens in list_del_init()/INIT_LIST_HEAD() while writing list->prev, while the prior write on list->next went well.

static inline void INIT_LIST_HEAD(struct list_head *list) { WRITE_ONCE(list->next, list); // This went well WRITE_ONCE(list->prev, list); /

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Severity by source

NVD PRIMARY 4.7 MEDIUM
AV:L/AC:H/PR:L/UI:N/S:U/C:N/I:N/A:H
SUSE MEDIUM
Red Hat 4.7 MEDIUM

Primary rating from NVD.

CVSS VectorNVD

Attack Vector
Local
Attack Complexity
High
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High

Lifecycle Timeline

6
Severity Changed
Oct 16, 2026 - 15:23 NVD
HIGH MEDIUM
CVSS changed
Oct 16, 2026 - 15:23 NVD
7.8 (HIGH) 4.7 (MEDIUM)
Severity Changed
Apr 27, 2026 - 14:22 NVD
MEDIUM HIGH
CVSS changed
Apr 27, 2026 - 14:22 NVD
4.7 (MEDIUM) 7.8 (HIGH)
Patch released
Apr 09, 2026 - 20:30 nvd
Patch available
CVE Published
Jan 25, 2026 - 15:15 nvd
MEDIUM 4.7

DescriptionNVD

In the Linux kernel, the following vulnerability has been resolved:

dst: fix races in rt6_uncached_list_del() and rt_del_uncached_list()

syzbot was able to crash the kernel in rt6_uncached_list_flush_dev() in an interesting way [1]

Crash happens in list_del_init()/INIT_LIST_HEAD() while writing list->prev, while the prior write on list->next went well.

static inline void INIT_LIST_HEAD(struct list_head *list) { WRITE_ONCE(list->next, list); // This went well WRITE_ONCE(list->prev, list); // Crash, @list has been freed. }

Issue here is that rt6_uncached_list_del() did not attempt to lock ul->lock, as list_empty(&rt->dst.rt_uncached) returned true because the WRITE_ONCE(list->next, list) happened on the other CPU.

We might use list_del_init_careful() and list_empty_careful(), or make sure rt6_uncached_list_del() always grabs the spinlock whenever rt->dst.rt_uncached_list has been set.

A similar fix is neeed for IPv4.

[1]

BUG: KASAN: slab-use-after-free in INIT_LIST_HEAD include/linux/list.h:46 [inline] BUG: KASAN: slab-use-after-free in list_del_init include/linux/list.h:296 [inline] BUG: KASAN: slab-use-after-free in rt6_uncached_list_flush_dev net/ipv6/route.c:191 [inline] BUG: KASAN: slab-use-after-free in rt6_disable_ip+0x633/0x730 net/ipv6/route.c:5020 Write of size 8 at addr ffff8880294cfa78 by task kworker/u8:14/3450

CPU: 0 UID: 0 PID: 3450 Comm: kworker/u8:14 Tainted: G L syzkaller #0 PREEMPT_{RT,(full)} Tainted: [L]=SOFTLOCKUP Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 10/25/2025 Workqueue: netns cleanup_net Call Trace: <TASK> dump_stack_lvl+0xe8/0x150 lib/dump_stack.c:120 print_address_description mm/kasan/report.c:378 [inline] print_report+0xca/0x240 mm/kasan/report.c:482 kasan_report+0x118/0x150 mm/kasan/report.c:595 INIT_LIST_HEAD include/linux/list.h:46 [inline] list_del_init include/linux/list.h:296 [inline] rt6_uncached_list_flush_dev net/ipv6/route.c:191 [inline] rt6_disable_ip+0x633/0x730 net/ipv6/route.c:5020 addrconf_ifdown+0x143/0x18a0 net/ipv6/addrconf.c:3853 addrconf_notify+0x1bc/0x1050 net/ipv6/addrconf.c:-1 notifier_call_chain+0x19d/0x3a0 kernel/notifier.c:85 call_netdevice_notifiers_extack net/core/dev.c:2268 [inline] call_netdevice_notifiers net/core/dev.c:2282 [inline] netif_close_many+0x29c/0x410 net/core/dev.c:1785 unregister_netdevice_many_notify+0xb50/0x2330 net/core/dev.c:12353 ops_exit_rtnl_list net/core/net_namespace.c:187 [inline] ops_undo_list+0x3dc/0x990 net/core/net_namespace.c:248 cleanup_net+0x4de/0x7b0 net/core/net_namespace.c:696 process_one_work kernel/workqueue.c:3257 [inline] process_scheduled_works+0xad1/0x1770 kernel/workqueue.c:3340 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3421 kthread+0x711/0x8a0 kernel/kthread.c:463 ret_from_fork+0x510/0xa50 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entry_64.S:246 </TASK>

Allocated by task 803: kasan_save_stack mm/kasan/common.c:57 [inline] kasan_save_track+0x3e/0x80 mm/kasan/common.c:78 unpoison_slab_object mm/kasan/common.c:340 [inline] __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:366 kasan_slab_alloc include/linux/kasan.h:253 [inline] slab_post_alloc_hook mm/slub.c:4953 [inline] slab_alloc_node mm/slub.c:5263 [inline] kmem_cache_alloc_noprof+0x18d/0x6c0 mm/slub.c:5270 dst_alloc+0x105/0x170 net/core/dst.c:89 ip6_dst_alloc net/ipv6/route.c:342 [inline] icmp6_dst_alloc+0x75/0x460 net/ipv6/route.c:3333 mld_sendpack+0x683/0xe60 net/ipv6/mcast.c:1844 mld_send_cr net/ipv6/mcast.c:2154 [inline] mld_ifc_work+0x83e/0xd60 net/ipv6/mcast.c:2693 process_one_work kernel/workqueue.c:3257 [inline] process_scheduled_works+0xad1/0x1770 kernel/workqueue.c:3340 worker_thread+0x8a0/0xda0 kernel/workqueue.c:3421 kthread+0x711/0x8a0 kernel/kthread.c:463 ret_from_fork+0x510/0xa50 arch/x86/kernel/process.c:158 ret_from_fork_asm+0x1a/0x30 arch/x86/entry/entr ---truncated---

Executive ViewAI

Why It Matters

CVE-2026-23004 presents moderate security risk, a race condition vulnerability rated CVSS 4.7. Exploitation could compromise the security of affected deployments. Organizations should apply vendor updates when available and monitor for exploitation.

Business Impact: Low
Compensating Controls

Apply vendor patch. If patching is delayed: implement rate limiting and resource quotas.

Threat Intelligence Overview

EPSS Score
0.0%
Top 93% exploitable
Data Quality
5 sources
Confidence: Medium
NVD CVE.org EPSS Vendor VulDB

How this decision was reached

The engine reads each signal below and applies a fixed list of rules from top to bottom. The first rule that matches sets the recommended action – like a statement, every line is shown.

SignalValue
Severity MEDIUM
CISA KEV No
Public POC No
EPSS 0.0%
Patch available Yes
Active threat No
Deciding rule
MEDIUM severity (CVSS 4.0-6.9)
What every action level means
Emergency Immediate action required. Criteria: CRITICAL + in CISA KEV (actively exploited) without patch, OR CRITICAL + EPSS > 30% without patch, OR CRITICAL + active threat signals without patch.
Act Now Prioritize within 24-48h. Criteria: in KEV with patch available, OR CRITICAL + public POC, OR HIGH + EPSS > 10%, OR CRITICAL + active threat, OR any CRITICAL severity.
This Week Schedule remediation this week. Criteria: HIGH severity (CVSS 7.0-8.9). Patch within normal change window.
This Month Plan within 30 days. Criteria: MEDIUM severity (CVSS 4.0-6.9), lower exploitation probability. Include in regular patch cycle.
Monitor Track and reassess. Criteria: LOW severity (CVSS 0.1-3.9), minimal exploitation risk. No immediate action needed.

SSVC AssessmentENISA

SSVC Decision· derived
Defer
Exploitation· derived
None
System Exposure· derived
Small
Automatable· derived
No
Human Impact
Low

Priority Score

24
Low Medium High Critical
KEV: 0
EPSS: 0
CVSS: +24
PoC: 0
Weaponized: 0
Threat intel: 0
Gov advisory: 0

Attack Technique

Race Condition MEDIUM

Race conditions occur when multiple concurrent requests exploit the brief time gap between checking a condition and acting upon it (TOCTOU - Time of Check, Time of Use).

Denial of Service MEDIUM

Denial of Service attacks render applications or systems unavailable by overwhelming resources or triggering failure conditions.

Affected Products (CPE)NVD

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:3.6:-:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.19:rc1:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.19:rc2:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.19:rc3:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.19:rc4:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.19:rc5:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.19:rc6:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.19:rc7:*:*:*:*:*:*
cpe:2.3:o:linux:linux_kernel:6.19:rc8:*:*:*:*:*:*

Same weakness CWE-362 – Race Condition

View all
CVE-2023-36884 HIGH POC
7.5
CVE-2016-5195 HIGH POC
7.0
CVE-2017-1000112 HIGH POC
7.0
CVE-2014-0196 MEDIUM POC
5.5
CVE-2014-0226 MEDIUM POC
6.8
CVE-2016-1757 HIGH POC
7.0
CVE-2016-8655 HIGH POC
7.8
CVE-2025-39964 MEDIUM POC
5.5

Same technique Denial Of Service

View all
CVE-2015-5119 CRITICAL POC
9.8
CVE-2011-2462 CRITICAL POC
9.8
CVE-2011-0611 HIGH POC
8.8
CVE-2012-1889 HIGH POC
8.8
CVE-2012-0507 CRITICAL POC
9.8
CVE-2014-1761 HIGH POC
7.8
CVE-2015-5122 CRITICAL POC
9.8
CVE-2011-0609 HIGH POC
7.8

Vendor StatusVendor

SUSE

Severity: Medium
Product Status
Container suse/sl-micro/6.0/base-os-container:2.1.3-7.105 Affected
Container suse/sl-micro/6.0/kvm-os-container:2.1.3-6.124 Affected
Container suse/sl-micro/6.0/rt-os-container:2.1.3-7.146 Affected
Container suse/sl-micro/6.1/baremetal-os-container:2.2.1-7.67 Affected
Container suse/sl-micro/6.1/base-os-container:2.2.1-5.90 Affected

References

Advisories & patches
ADVISORY https://ubuntu.com/security/notices/USN-8567-1 ADVISORY https://vuldb.com/?id.342823 ADVISORY https://www.suse.com/support/update/SUSE-SU-2026:0928/ ADVISORY https://www.suse.com/support/update/SUSE-SU-2026:0961/ ADVISORY https://www.suse.com/support/update/SUSE-SU-2026:0962/ ADVISORY https://www.suse.com/support/update/SUSE-SU-2026:0984/ ADVISORY https://www.suse.com/support/update/SUSE-SU-2026:1003/ ADVISORY https://www.suse.com/support/update/SUSE-SU-2026:1041/ ADVISORY https://www.suse.com/support/update/SUSE-SU-2026:1077/ ADVISORY https://www.suse.com/support/update/SUSE-SU-2026:1078/ ADVISORY https://www.suse.com/support/update/SUSE-SU-2026:1081/ ADVISORY https://www.suse.com/support/update/SUSE-SU-2026:1131/ ADVISORY https://www.suse.com/support/update/SUSE-SU-2026:20667/ ADVISORY https://www.suse.com/support/update/SUSE-SU-2026:20711/ ADVISORY https://www.suse.com/support/update/SUSE-SU-2026:20713/ ADVISORY https://www.suse.com/support/update/SUSE-SU-2026:20720/ ADVISORY https://www.suse.com/support/update/SUSE-SU-2026:20772/ ADVISORY https://www.suse.com/support/update/SUSE-SU-2026:20794/ ADVISORY https://www.suse.com/support/update/SUSE-SU-2026:20819/ ADVISORY https://www.suse.com/support/update/SUSE-SU-2026:20838/ ADVISORY https://www.suse.com/support/update/SUSE-SU-2026:20845/ ADVISORY https://www.suse.com/support/update/SUSE-SU-2026:20872/ ADVISORY https://www.suse.com/support/update/SUSE-SU-2026:20873/ ADVISORY https://www.suse.com/support/update/SUSE-SU-2026:20876/ ADVISORY https://www.suse.com/support/update/SUSE-SU-2026:20931/ REF https://git.kernel.org/stable/c/722de945216144af7cd4d39bdeb936108d2595a7 REF https://git.kernel.org/stable/c/72f39a3cc78b2c6d780376adf68e3de5355e71f8 REF https://git.kernel.org/stable/c/815db2363e51f0ef416947492d4dac5b7a520f56 REF https://git.kernel.org/stable/c/9a6f0c4d5796ab89b5a28a890ce542344d58bd69 REF https://git.kernel.org/stable/c/f24a52948c95e02facbca2b3b6eb5a225e27eb01

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