{
  "affected": [
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:12",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6.1.170-1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:13",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6.12.85-1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:14",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6.19.6-1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "details": "In the Linux kernel, the following vulnerability has been resolved:  xfrm6: fix uninitialized saddr in xfrm6_get_saddr()  xfrm6_get_saddr() does not check the return value of ipv6_dev_get_saddr(). When ipv6_dev_get_saddr() fails to find a suitable source address (returns -EADDRNOTAVAIL), saddr-\u003ein6 is left uninitialized, but xfrm6_get_saddr() still returns 0 (success).  This causes the caller xfrm_tmpl_resolve_one() to use the uninitialized address in xfrm_state_find(), triggering KMSAN warning:  ===================================================== BUG: KMSAN: uninit-value in xfrm_state_find+0x2424/0xa940  xfrm_state_find+0x2424/0xa940  xfrm_resolve_and_create_bundle+0x906/0x5a20  xfrm_lookup_with_ifid+0xcc0/0x3770  xfrm_lookup_route+0x63/0x2b0  ip_route_output_flow+0x1ce/0x270  udp_sendmsg+0x2ce1/0x3400  inet_sendmsg+0x1ef/0x2a0  __sock_sendmsg+0x278/0x3d0  __sys_sendto+0x593/0x720  __x64_sys_sendto+0x130/0x200  x64_sys_call+0x332b/0x3e70  do_syscall_64+0xd3/0xf80  entry_SYSCALL_64_after_hwframe+0x77/0x7f  Local variable tmp.i.i created at:  xfrm_resolve_and_create_bundle+0x3e3/0x5a20  xfrm_lookup_with_ifid+0xcc0/0x3770 =====================================================  Fix by checking the return value of ipv6_dev_get_saddr() and propagating the error.",
  "id": "DEBIAN-CVE-2026-43139",
  "modified": "2026-09-14T16:47:50.386077759Z",
  "published": "2026-05-06T12:16:31.227Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://security-tracker.debian.org/tracker/CVE-2026-43139"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H",
      "type": "CVSS_V3"
    }
  ],
  "upstream": [
    "CVE-2026-43139"
  ]
}