{
  "affected": [
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:12",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:13",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "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:  s390/ctcm: Prevent XID null dereference  The mpc_validate_xid() function sets grp-\u003esaved_xid2-\u003exid2_flag2 to 0x40 to signal XID validation error. If peer XID is NULL or r/w channel pairing mismatch happens, grp-\u003esaved_xid2 is never initialized. An attempt to set the flag in such case leads to NULL dereference.  Fix this by using the always available priv-\u003exid-\u003exid2_flag2 instead of grp-\u003esaved_xid2-\u003exid2_flag2 for validation errors.",
  "id": "DEBIAN-CVE-2026-99126",
  "modified": "2026-10-29T05:47:33.351124932Z",
  "published": "2026-10-28T11:17:32.317Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://security-tracker.debian.org/tracker/CVE-2026-99126"
    }
  ],
  "upstream": [
    "CVE-2026-99126"
  ]
}