CVE-2025-71080
- Source
- https://cve.org/CVERecord?id=CVE-2025-71080
- Import Source
- https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2025-71080.json
- JSON Data
- https://api.test.osv.dev/v1/vulns/CVE-2025-71080
- Downstream
- Related
- Published
- 2026-01-13T15:34:44Z
- Modified
- 2026-08-12T03:30:41Z
- Severity
-
- 7.5 (High) CVSS_V3 - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
- Summary
- ipv6: fix a BUG in rt6_get_pcpu_route() under PREEMPT_RT
- Details
-
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.
- Database specific
{ "cna_assigner": "Linux", "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/71xxx/CVE-2025-71080.json" }- References
-
- https://git.kernel.org/stable/c/1adaea51c61b52e24e7ab38f7d3eba023b2d050d
- https://git.kernel.org/stable/c/1dc33ad0867325f8d2c6d7b2a6f542d4f3121f66
- https://git.kernel.org/stable/c/787515ccb2292f82eb0876993129154629a49651
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/71xxx/CVE-2025-71080.json
- https://nvd.nist.gov/vuln/detail/CVE-2025-71080
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git