{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2025-71080",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2025-71080"
  ],
  "published": "2026-01-13T15:35:54Z",
  "summary": "ipv6: fix a BUG in rt6_get_pcpu_route() under PREEMPT_RT",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nipv6: fix a BUG in rt6_get_pcpu_route() under PREEMPT_RT\n\nOn PREEMPT_RT kernels, after rt6_get_pcpu_route() returns NULL, the\ncurrent task can be preempted. Another task running on the same CPU\nmay then execute rt6_make_pcpu_route() and successfully install a\npcpu_rt entry. When the first task resumes execution, its cmpxchg()\nin rt6_make_pcpu_route() will fail because rt6i_pcpu is no longer\nNULL, triggering the BUG_ON(prev). It's easy to reproduce it by adding\nmdelay() after rt6_get_pcpu_route().\n\nUsing preempt_disable/enable is not appropriate here because\nip6_rt_pcpu_alloc() may sleep.\n\nFix this by handling the cmpxchg() failure gracefully on PREEMPT_RT:\nfree our allocation and return the existing pcpu_rt installed by\nanother task. The BUG_ON is replaced by WARN_ON_ONCE for non-PREEMPT_RT\nkernels where such races should not occur.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
    }
  ],
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  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2025-71080"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/1dc33ad0867325f8d2c6d7b2a6f542d4f3121f66"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/787515ccb2292f82eb0876993129154629a49651"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/1adaea51c61b52e24e7ab38f7d3eba023b2d050d"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-05T12:19:11Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.5,
      "cvss_v3_severity": "High",
      "scenario": "AV:N - Unauthenticated IPv6 packets reach ip6_route_input() and ip6_pol_route() before transport delivery or authentication, exposing the vulnerable per-CPU route creation path to a remote peer.\nAC:L - In a reasonable multi-queue or threaded-network PREEMPT_RT deployment, concurrent attacker-driven packet streams can exercise both sides of the short empty-slot race repeatedly. No memory-layout guess or inherently uncontrollable condition is required.\nPR:N - The inbound IPv6 routing path performs no capability or authentication check before reaching the vulnerable code.\nUI:N - No victim action is required; processing attacker-generated IPv6 traffic triggers route lookup automatically.\nS:U - The resulting kernel failure affects the same host and security authority in which packet processing occurs, without crossing a virtualization or sandbox boundary.\nC:N - The failed cmpxchg only detects an already-installed valid route and immediately reaches BUG_ON; it provides no memory disclosure or read primitive.\nI:N - The atomic installation fails without overwriting the existing pointer, and there is no use-after-free, out-of-bounds write, or other attacker-controlled modification.\nA:H - BUG_ON executes while bottom halves are disabled and raises a fatal invalid-opcode oops, which can directly produce a kernel panic and complete system outage."
    }
  }
}