CVE-2025-40158
Unknown Unknown - Not Provided
BaseFortify

Publication date: 2025-11-12

Last updated on: 2025-11-12

Assigner: kernel.org

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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Meta Information
Published
2025-11-12
Last Modified
2025-11-12
Generated
2026-05-07
AI Q&A
2025-11-13
EPSS Evaluated
2026-05-05
NVD
CVE-2025-40158
Affected Vendors & Products
Showing 1 associated CPE
Vendor Product Version / Range
linux linux_kernel *
Helpful Resources
Exploitability
CWE
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CWE ID Description
CWE-UNKNOWN
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AI Powered Q&A
Can you explain this vulnerability to me?

This vulnerability in the Linux kernel involves the ipv6 networking code, specifically in the ip6_output() function. The issue is related to the use of Read-Copy-Update (RCU) mechanisms to prevent a possible Use-After-Free (UAF) condition. The fix involves using RCU in ip6_output() to safely use dst_dev_rcu(), which prevents the UAF vulnerability. Additionally, the rcu_read_lock()/rcu_read_unlock() pairs were removed from ip6_finish_output2() as part of the fix.


How can this vulnerability impact me? :

This vulnerability could lead to a Use-After-Free condition in the IPv6 output processing of the Linux kernel, which may cause system instability, crashes, or potentially allow an attacker to execute arbitrary code or cause denial of service by exploiting the memory corruption.


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