{
  "affected": [
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:12",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6.1.187-1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:13",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6.12.101-1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:14",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "7.1.6-1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:12",
        "name": "linux-6.12"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6.12.101-1~deb12u1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "details": "In the Linux kernel, the following vulnerability has been resolved:  xfrm6: clear dst.dev on error to avoid double netdev_put in xfrm6_fill_dst()  On the error path where in6_dev_get(dev) returns NULL, xfrm6_fill_dst() releases the device reference with netdev_put() but leaves xdst-\u003eu.dst.dev set. dst_destroy() later calls netdev_put(dst-\u003edev) again, so the same net_device reference is released twice, underflowing its refcount (ref_tracker WARNING + \"unregister_netdevice: waiting for \u003cdev\u003e to become free\").  Clear xdst-\u003eu.dst.dev after the netdev_put(), the same way the XFRM device-offload paths xfrm_dev_state_add() and xfrm_dev_policy_add() in net/xfrm/xfrm_device.c NULL -\u003edev when releasing the reference on error.    ref_tracker: reference already released.   ref_tracker: allocated in:    xfrm6_fill_dst (net/ipv6/xfrm6_policy.c:86)    ...    udpv6_sendmsg (net/ipv6/udp.c:1696)    ...   ref_tracker: freed in:    xfrm6_fill_dst (net/ipv6/xfrm6_policy.c:90)    ...   WARNING: lib/ref_tracker.c:322 at ref_tracker_free+0x58b/0x780    dst_destroy (net/core/dst.c:115)    rcu_core    handle_softirqs    ...",
  "id": "DEBIAN-CVE-2026-64580",
  "modified": "2026-09-14T16:47:26.861756337Z",
  "published": "2026-08-05T08:16:38.027Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://security-tracker.debian.org/tracker/CVE-2026-64580"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "upstream": [
    "CVE-2026-64580"
  ]
}