{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-98364",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-98364"
  ],
  "published": "2026-10-06T08:47:10Z",
  "summary": "xfrm: hold net_device reference under RCU in bundle creation",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nxfrm: hold net_device reference under RCU in bundle creation\n\nxfrm_bundle_create() and xfrm_create_dummy_bundle() read dst->dev into\na local pointer without taking a device reference, then pass it to\nxfrm_fill_dst(). A concurrent RTM_DELLINK replaces dst->dev via\ndst_dev_put() and frees the old net_device, causing a use-after-free\nwhen xfrm6_fill_dst() later dereferences the stale dev pointer.\n\n  BUG: KASAN: slab-use-after-free in xfrm6_fill_dst+0x82c/0x860\n  (net/ipv6/xfrm6_policy.c:86 netdev_hold())\n  Read of size 8 at addr ffff8880142fe588 by task exploit/153\n  Call Trace:\n   xfrm6_fill_dst+0x82c/0x860\n   xfrm_resolve_and_create_bundle+0x21d4/0x2bd0\n   xfrm_lookup_with_ifid+0x485/0x1640\n   ip6_dst_lookup_flow+0x19b/0x1e0\n   udpv6_sendmsg+0x1443/0x2dd0\n\nFix this by reading dst->dev via dst_dev_rcu() and keeping the RCU\nread-side critical section active until xfrm_fill_dst() has taken the\nrequired device references.",
  "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-2026-98364"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/8d85d6bc9c46dc41cb2be0eac53f8ab068c3a807"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/9fa903b24b1f46b4ff5443bcd4aca23e5c57f9c1"
    }
  ],
  "database_specific": {
    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-10-07T06:50:27Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - Both sides of the race are local syscalls: sendmsg() (udpv6_sendmsg->ip6_dst_lookup_flow->xfrm_lookup_with_ifid->xfrm_bundle_create) and an RTM_DELLINK rtnetlink request that frees the net_device. A remote peer cannot delete the link, so the network cannot cause the freed state.\nAC:L - The attacker controls both sides of the race: they repeatedly send through an xfrm-policy-matched route while deleting the link in a loop. The window between reading dst->dev and netdev_hold() in xfrm_fill_dst() is short, but the attacker can retry as often as needed.\nPR:L - xfrm_user_rcv_msg only checks netlink_net_capable(CAP_NET_ADMIN), and RTM_DELLINK is also checked per namespace. An unprivileged user with unshare -Urn can create a device, install the XFRM policy and state, and delete the device inside their own network namespace.\nUI:N - No victim action is needed: the attacker sets up the namespace, the xfrm configuration, the sending socket and the link deletion entirely on their own.\nS:U - The use-after-free is inside the kernel's own networking code and the impact stays within the kernel's security authority; no VM or IOMMU boundary is crossed.\nC:H - xfrm6_fill_dst() reads dev->ip6_ptr from the freed net_device through in6_dev_get() and stores the stale dev in a new dst. A reclaimed object controls those values, which can be used to disclose kernel memory.\nI:H - netdev_hold() increments a refcount inside the freed net_device, and in6_dev_get() increments a refcount on a pointer taken from the reclaimed object. Both are writes into attacker-reclaimable slab memory, usable to corrupt kernel data and hijack control flow.\nA:H - KASAN reports a slab-use-after-free in xfrm6_fill_dst(). On production kernels the stale dev stays attached to the new xfrm dst and is dereferenced later, which leads to an oops or panic."
    }
  }
}