{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-97940",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-97940"
  ],
  "published": "2026-09-25T10:24:31Z",
  "summary": "ipv6: fix fib6 walker UAF on seq stop",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nipv6: fix fib6 walker UAF on seq stop\n\nipv6_route_iter_active() treats a walker in FWS_U at the table root as\nalready unlinked. fib6_del_route() can move a still-linked walker into\nthat same state when the current leaf is the last route at the root,\nso ipv6_route_native_seq_stop() skips fib6_walker_unlink(). The seq\nprivate object can then be freed while it remains on\nnet->ipv6.fib6_walkers. A later route deletion walks the dangling list\nand uses the freed walker.\n\nUse the list head as membership state and reinitialize it when\nunlinking. Keep the existing w->node check so a never-started iterator\nwith a zeroed private object is not treated as linked.\n\nThe same stop helper is used by /proc/net/ipv6_route and by the BPF\nipv6_route iterator. The BPF show path only widens the race.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"
    }
  ],
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  ],
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-97940"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/9a3f73d62c86271614eda4c43315230896a37018"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/63407cddabc5992b5ac03af165559f4a1968a032"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/05b687ee04f816658f4a9cf586f4d2f129157943"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/14fdaba201fdff92a3e45994e02bccda409cb19d"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/0eede1689610e9eeaf729ba86fd1321799eb91a0"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/b89b691dd00bf39b9ba39ab9446f8c62f419fa7b"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/4553cfafa8d05c4ce20b1d18f79d9bb3b303fc02"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/19b4ed644d68098cc62ab612727f40d30f43476c"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-10-03T11:04:09Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The bug is reached by a local read() of /proc/net/ipv6_route (ipv6_route_native_seq_stop via ipv6_route_seq_ops, or the BPF ipv6_route iterator) racing a local RTM_DELROUTE netlink request that runs fib6_del_route(). No remote protocol supplies data that causes the missed fib6_walker_unlink().\nAC:L - The attacker controls both sides of the race. One thread reads /proc/net/ipv6_route while another repeatedly adds and deletes the last route in the table root (e.g. ::/0), which moves the linked walker to FWS_U at the root so seq_stop skips the unlink. The attempt can be retried freely.\nPR:L - /proc/net/ipv6_route is created with mode 0 (0444, world-readable). Deleting routes needs CAP_NET_ADMIN only over the namespace, which an unprivileged user gets with unshare -Urn, and net->ipv6.fib6_walkers is per-namespace, so the whole attack runs in an attacker-owned netns.\nUI:N - No victim action is needed. The attacker opens, reads and closes the proc file and issues the route deletions themselves.\nS:U - The use-after-free happens in kernel heap memory and gives kernel-level impact within the same security authority. No VM or hardware isolation boundary is crossed.\nC:H - The freed seq_file private object (struct ipv6_route_iter, holding the fib6_walker) stays on net->ipv6.fib6_walkers. Later FOR_WALKERS loops read w->state, w->leaf and w->node from memory the attacker can reallocate with controlled contents, a UAF usable for kernel memory disclosure.\nI:H - fib6_del_route() and fib6_repair_tree() write w->leaf, w->state and w->node into the freed walker, and list_add/list_del on w->lh write pointers into it. That is a write primitive into a reallocated kernel heap object, usable for corruption and privilege escalation.\nA:H - Any later route deletion or tree repair in that namespace walks the dangling fib6_walkers entry, which causes list corruption or a KASAN/oops crash of the kernel."
    }
  }
}