{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2026-43139",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2026-43139"
  ],
  "published": "2026-05-06T11:29:17Z",
  "summary": "xfrm6: fix uninitialized saddr in xfrm6_get_saddr()",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nxfrm6: fix uninitialized saddr in xfrm6_get_saddr()\n\nxfrm6_get_saddr() does not check the return value of\nipv6_dev_get_saddr(). When ipv6_dev_get_saddr() fails to find a suitable\nsource address (returns -EADDRNOTAVAIL), saddr->in6 is left\nuninitialized, but xfrm6_get_saddr() still returns 0 (success).\n\nThis causes the caller xfrm_tmpl_resolve_one() to use the uninitialized\naddress in xfrm_state_find(), triggering KMSAN warning:\n\n=====================================================\nBUG: KMSAN: uninit-value in xfrm_state_find+0x2424/0xa940\n xfrm_state_find+0x2424/0xa940\n xfrm_resolve_and_create_bundle+0x906/0x5a20\n xfrm_lookup_with_ifid+0xcc0/0x3770\n xfrm_lookup_route+0x63/0x2b0\n ip_route_output_flow+0x1ce/0x270\n udp_sendmsg+0x2ce1/0x3400\n inet_sendmsg+0x1ef/0x2a0\n __sock_sendmsg+0x278/0x3d0\n __sys_sendto+0x593/0x720\n __x64_sys_sendto+0x130/0x200\n x64_sys_call+0x332b/0x3e70\n do_syscall_64+0xd3/0xf80\n entry_SYSCALL_64_after_hwframe+0x77/0x7f\n\nLocal variable tmp.i.i created at:\n xfrm_resolve_and_create_bundle+0x3e3/0x5a20\n xfrm_lookup_with_ifid+0xcc0/0x3770\n=====================================================\n\nFix by checking the return value of ipv6_dev_get_saddr() and propagating\nthe error.",
  "severity": [
    {
      "type": "CVSS_V3",
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H"
    }
  ],
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    {
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      "url": "https://www.cve.org/CVERecord?id=CVE-2026-43139"
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    "upstream_modified": "2026-08-05T13:16:28Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 8.6,
      "cvss_v3_severity": "High",
      "scenario": "AV:N - A network-triggered path exists on an IPv6/IPsec endpoint: received IPv6 traffic that causes kernel-generated output, such as ICMPv6/NDISC replies or service responses, enters xfrm_lookup_route() and reaches xfrm_tmpl_resolve_one()->xfrm6_get_saddr(). The same code is locally reachable with sendmsg(), but a reasonably configured XFRM/IPsec host can be triggered by network traffic.\nAC:L - No race, heap grooming, or timing condition is required; once the affected outbound XFRM template has a wildcard IPv6 tunnel source and source address selection fails, the unchecked error path is deterministic. Matching output traffic can be triggered repeatedly.\nPR:N - The network trigger does not require the attacker to authenticate or hold local privileges. Creating the XFRM policy requires CAP_NET_ADMIN, including via a user/net namespace for local testing, but in the network scenario that policy is preexisting victim configuration.\nUI:N - No victim user action is required after the vulnerable XFRM/IPsec configuration is present. Packets or local sends directly drive the kernel output path.\nS:U - The bug affects kernel XFRM/IPv6 processing within the same host security authority. It does not cross a VM, IOMMU, or separate security scope boundary.\nC:L - The uninitialized value is a bounded 16-byte IPv6 source address from kernel stack, used in hashes/comparisons and potentially copied into XFRM acquire state/messages. This is limited kernel memory disclosure, not an arbitrary read primitive.\nI:L - The uninitialized source address can influence XFRM state lookup/acquire behavior and create or notify state using an unintended local tunnel endpoint. This is limited integrity impact to IPsec/XFRM state handling, not arbitrary modification.\nA:H - Syzbot reported a kernel BUG/KMSAN finding in xfrm_state_find(), and the bad value is consumed in core XFRM state lookup/acquire paths that can be triggered repeatedly. Kernel warning/oops/panic conditions are high availability impact."
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}