{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-98241",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-98241"
  ],
  "published": "2026-10-06T08:47:10Z",
  "summary": "ipv6: xfrm: use full sockets in local error paths",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nipv6: xfrm: use full sockets in local error paths\n\nxfrm6_local_rxpmtu() and xfrm6_local_error() dereference skb->sk as if it\nalways pointed at a full IPv6 socket.\n\nThat is not guaranteed. TCP SYN-ACK skbs can be owned by a\nTCP_NEW_SYN_RECV request_sock while the output path itself is driven by the\nfull listener. If rerouting selects an IPv6 XFRM tunnel route with a lower\nMTU, the local PMTU/error handling path can reach these callbacks with that\nmini-socket still attached to the skb.\n\nThe callbacks then miscast the request socket as a full inet/IPv6 socket and\ncan read beyond the request_sock allocation when they access inet_sock or\nipv6_pinfo state.\n\nResolve the owner with skb_to_full_sk() in both callbacks and bail out when\nno full socket is attached. This matches the surrounding XFRM IPv6 PMTU/error\nlogic, which already reasons about full sockets with skb_to_full_sk().",
  "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-2026-98241"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/b1a88633c36d2cbc3831382f3846754d344276fd"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/904a0e827d0d7189271a3a2eb648293809f25efc"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/675919e08ce266b8cac11fd9af29170e762a480f"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/60459c670329d586a58db5d8f811fa5accfe4862"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/ca3d68c3213475b53db6647e159dc73bd1af5ab1"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/4c030a0400ebfd2318361c923a88103b2c67c49f"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/c21f3f7fbfeda7c5794f606cb0ffcc2d9001eef8"
    },
    {
      "type": "FIX",
      "url": "https://git.kernel.org/stable/c/6973a21ee73c5567f883813c8ef414774b45892f"
    }
  ],
  "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 - The fixed xfrm6_local_error() is reached via __xfrm6_output() -> xfrm_local_error() only if a rerouted SYN-ACK exceeds an xfrm tunnel MTU below ~100 bytes; that needs local xfrm/route/netfilter setup. A remote SYN carries no malformed data and can't create this state (IPv4 PMTU floor is 552, xfrm6_tunnel_check_size clamps to 1280).\nAC:L - The attacker builds every precondition: an IPv6-in-IPv4 tunnel-mode xfrm SA/policy, a tiny outer MTU, a LOCAL_OUT reroute, and a TCP listener they connect to. Each SYN deterministically sends a SYN-ACK owned by a TCP_NEW_SYN_RECV request_sock down the !ignore_df && toobig branch.\nPR:L - The needed XFRM_MSG_NEWSA/NEWPOLICY, nftables rules and link MTU changes only need CAP_NET_ADMIN in the netns, which an unprivileged user gets via unshare -Urn; the listener and connect() are ordinary syscalls.\nUI:N - The attacker sets up the namespace and drives the handshake that emits the SYN-ACK themselves; no other user has to do anything.\nS:U - The out-of-bounds access corrupts kernel heap memory in the same kernel that enforces the attacker's namespace; no hypervisor or IOMMU boundary is crossed.\nC:H - xfrm6_local_error() passes the request_sock to ipv6_local_error() as a full IPv6 socket; inet6_test_bit(RECVERR6) reads inet_flags past the end of the tcp6_request_sock allocation, into the next slab object, and the rest of the path keeps reading socket fields out of bounds.\nI:H - If the out-of-bounds RECVERR6 bit is set, sock_queue_err_skb() does atomic_add on an OOB sk_rmem_alloc, links an skb into an OOB sk_error_queue list and calls the OOB sk_error_report pointer: heap writes plus control-flow hijack if the attacker grooms the adjacent object.\nA:H - Treating neighbouring slab memory as sk_error_queue and sk_error_report gives list corruption or a wild indirect call, crashing the kernel; the attacker can repeat it with each SYN."
    }
  }
}