{
  "cveId": "CVE-2026-80995",
  "url": "https://patchblox.com/security/cve/CVE-2026-80995",
  "summary": "CVE-2026-80995 is fixed in linux on 1 platform by DEBIAN-CVE-2026-80995 (version 7.2.6-1), released September 23, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "linux: In the Linux kernel, the following vulnerability has been resolved:  net: mctp: hold a reference to the route device...",
  "description": "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\u0027s 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 (\u0022refcount_t: addition on 0 ... mctp_dev_hold\u0022).  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.",
  "published": "2026-09-11T20:19:06Z",
  "severity": "high",
  "cvss": 7.8,
  "cvssVector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
  "epss": 0.00165,
  "epssPercentile": 0.05756,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "7.2.6-1",
      "fix": "DEBIAN-CVE-2026-80995",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-80995",
      "released": "2026-09-23T19:19:02Z"
    }
  ],
  "noFixYet": [],
  "dataAsOf": "2026-11-08T06:59:42Z",
  "attribution": {
    "text": "Data: Patchblox Patch Radar",
    "url": "https://patchblox.com/security/patch-radar",
    "terms": "https://patchblox.com/security/patch-radar/use-the-data"
  }
}