{
  "affected": [
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:14",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "details": "In the Linux kernel, the following vulnerability has been resolved:  net: mctp: hold a reference to the route device in mctp_route_lookup()  mctp_route_lookup() uses rt-\u003edev without holding a reference on it. mctp_route_lookup_single() returns the route under RCU only, so the route's device can be torn down concurrently: mctp_dev_put() drops the last reference and synchronously kfree()s mdev-\u003eaddrs.  mctp_dev_saddr() then reads rt-\u003edev-\u003eaddrs[0], giving a use-after-free reachable by an unprivileged local AF_MCTP user on the receive/forwarding path (no CAP_NET_RAW required):    BUG: KASAN: slab-use-after-free in mctp_route_lookup   Read of size 1 at addr ... by task mctp_uaf/...    mctp_route_lookup    mctp_pkttype_receive   Freed by task ...:    kfree    mctp_dev_put    mctp_dev_notify  In the same window mctp_dst_from_route() -\u003e mctp_dev_hold() also increments a refcount that has already reached zero (\"refcount_t: addition on 0 ... mctp_dev_hold\").  This reintroduces the use-after-free class of CVE-2023-3439: the source address lookup was moved ahead of the point where the destination takes its device reference.  Take a reference with refcount_inc_not_zero() before touching rt-\u003edev, skip a device that is already dead, and drop the reference once the destination has taken its own.",
  "id": "DEBIAN-CVE-2026-80995",
  "modified": "2026-09-14T08:47:33.814871376Z",
  "published": "2026-09-11T20:19:06.497Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://security-tracker.debian.org/tracker/CVE-2026-80995"
    }
  ],
  "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-2026-80995"
  ]
}