CVE-2025-71080

In the Linux kernel, the following vulnerability has been resolved: ipv6: fix a BUG in rt6_get_pcpu_route() under PREEMPT_RT On PREEMPT_RT kernels, after rt6_get_pcpu_route() returns NULL, the current task can be preempted. Another task running on the same CPU may then execute rt6_make_pcpu_route() and successfully install a pcpu_rt entry. When the first task resumes execution, its cmpxchg() in rt6_make_pcpu_route() will fail because rt6i_pcpu is no longer NULL, triggering the BUG_ON(prev). It's easy to reproduce it by adding mdelay() after rt6_get_pcpu_route(). Using preempt_disable/enable is not appropriate here because ip6_rt_pcpu_alloc() may sleep. Fix this by handling the cmpxchg() failure gracefully on PREEMPT_RT: free our allocation and return the existing pcpu_rt installed by another task. The BUG_ON is replaced by WARN_ON_ONCE for non-PREEMPT_RT kernels where such races should not occur.

• CWE-617

• https://git.kernel.org/stable/c/1adaea51c61b52e24e7ab38f7d3eba023b2d050dPatch
• https://git.kernel.org/stable/c/1dc33ad0867325f8d2c6d7b2a6f542d4f3121f66Patch
• https://git.kernel.org/stable/c/787515ccb2292f82eb0876993129154629a49651Patch

Published

Jan 13, 2026

Last Modified

Jul 30, 2026

Status

Modified

• How Strix found a critical auth bypass in etcdStrix autonomously discovered a critical authentication bypass in etcd, later designated CVE-2026-33413.
• Autonomous PentestingAI agents that find and validate exploitable vulnerabilities like this one across your applications.
• PR ReviewsPentest every pull request so vulnerable code is caught before it ships to production.
• AI Penetration TestingHow AI-driven penetration testing continuously covers your attack surface.

• CVE-2025-71075In the Linux kernel, the following vulnerability has been re…7.8
• CVE-2025-71076In the Linux kernel, the following vulnerability has been re…5.5
• CVE-2025-71077In the Linux kernel, the following vulnerability has been re…5.5
• CVE-2025-71078In the Linux kernel, the following vulnerability has been re…7.8
• CVE-2025-71079In the Linux kernel, the following vulnerability has been re…5.5
• CVE-2025-7108A vulnerability classified as critical was found in risesoft…5.4
• CVE-2025-71081In the Linux kernel, the following vulnerability has been re…5.5
• CVE-2025-71082In the Linux kernel, the following vulnerability has been re…7.8
• CVE-2025-71083In the Linux kernel, the following vulnerability has been re…5.5
• CVE-2025-71084In the Linux kernel, the following vulnerability has been re…5.5
• CVE-2025-71085In the Linux kernel, the following vulnerability has been re…5.5
• CVE-2025-71086In the Linux kernel, the following vulnerability has been re…7.8