CVE-2025-40158Disclosure

LOWCVSS 8.1 · HIGH

Signal is active with 1 mentions in latest observed window

Immediate actions

Track advisory updates for patch or workaround availability

Recommended action window: Monitor and triage in normal cycle

NVD description

In the Linux kernel, the following vulnerability has been resolved: ipv6: use RCU in ip6_output() Use RCU in ip6_output() in order to use dst_dev_rcu() to prevent possible UAF. We can remove rcu_read_lock()/rcu_read_unlock() pairs from ip6_finish_output2().

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0.0/ 10 priority

Sources & remediation

Other references

Priority

LOW

Exploitation

NONE

PoC

NONE

Patch

NONE

Momentum

NONE

Threat summary

1 mentions across 1 observed day

What's happening

Technical details provided in 1 signal
Disclosure: 1 classified signal
1 total mentions across 1 day

Deep dive

Activity timeline1 mentions / 1d

Signal classification1 categories

Disclosure

1100.0%

Referenced assets1 URL

By indicator

https://threatcluster.io/cluster/multiple-cves-identified-in-ipv6-implementation-by-microsoft-c1d4a6c8

Full discourse1 post

ThreatCluster@threatcluster233d
Disclosure
Microsoft discloses two critical IPv6 flaws CVE-2025-40158 (ip6_output) and CVE-2025-40135 (ip6_xmit) published Nov 12 2025 affecting systems using IPv6 RCU handling. #Vulnerability https://threatcluster.io/cluster/multiple-cves-identified-in-ipv6-implementation-by-microsoft-c1d4a6c8
Post summary
Microsoft announced two critical IPv6 vulnerabilities (CVE-2025-40158 and CVE-2025-40135) affecting IPv6 RCU handling, but no PoC, exploit, or patch details are provided in the brief.
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