{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-31663",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-31663"
  ],
  "published": "2026-04-24T14:47:31Z",
  "summary": "xfrm: hold dev ref until after transport_finish NF_HOOK",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nxfrm: hold dev ref until after transport_finish NF_HOOK\n\nAfter async crypto completes, xfrm_input_resume() calls dev_put()\nimmediately on re-entry before the skb reaches transport_finish.\nThe skb->dev pointer is then used inside NF_HOOK and its okfn,\nwhich can race with device teardown.\n\nRemove the dev_put from the async resumption entry and instead\ndrop the reference after the NF_HOOK call in transport_finish,\nusing a saved device pointer since NF_HOOK may consume the skb.\nThis covers NF_DROP, NF_QUEUE and NF_STOLEN paths that skip\nthe okfn.\n\nFor non-transport exits (decaps, gro, drop) and secondary\nasync return points, release the reference inline when\nasync is set.",
  "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": [
    {
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      "url": "https://www.cve.org/CVERecord?id=CVE-2026-31663"
    },
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      "scenario": "AV:L - The complete attacker-controlled path requires a local unprivileged user to create a user/net namespace, configure transport-mode XFRM state, send traffic, and tear down the namespace/device in parallel.\nAC:L - The race is attacker-controlled in the user-namespace scenario: the attacker controls packet injection and device/netns teardown and can repeat the sequence reliably.\nPR:L - XFRM and rtnetlink setup require CAP_NET_ADMIN, but these checks are against the network namespace user_ns and are reachable after unshare -Urn by an unprivileged local user.\nUI:N - No victim action is required once the attacker can run local code and create the namespace setup.\nS:U - The vulnerable component and impacted resource are the kernel itself; this is a standard kernel memory-safety issue rather than a VM or hardware boundary escape.\nC:H - This is a net_device use-after-free, and freed kernel heap objects can potentially be reclaimed and abused for kernel memory disclosure.\nI:H - Use-after-free in kernel networking code can potentially be shaped into control-flow or data-structure corruption, so high integrity impact is appropriate.\nA:H - The issue was reproduced as a KASAN slab-use-after-free in the async XFRM reinject path and can crash the kernel."
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}