{
  "affected": [
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:12",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6.1.176-1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:13",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "6.12.94-1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    },
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:14",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "7.0.12-1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "details": "In the Linux kernel, the following vulnerability has been resolved:  net/smc: reject CHID-0 ACCEPT that matches an empty ism_dev slot  On the SMC-D client, slot 0 of ini-\u003eism_dev[]/ini-\u003eism_chid[] is reserved for an SMC-Dv1 device. smc_find_ism_v2_device_clnt() populates V2 entries starting at index 1, so when no V1 device is selected slot 0 is left in its kzalloc()'ed state with ism_dev[0] == NULL and ism_chid[0] == 0.  smc_v2_determine_accepted_chid() then matches the peer's CHID against the array starting from index 0 using the CHID alone. A malicious peer replying to a SMC-Dv2-only proposal with d1.chid == 0 matches the empty slot, ini-\u003eism_selected becomes 0, and the subsequent ism_dev[0]-\u003elgr_lock dereference in smc_conn_create() faults at offsetof(struct smcd_dev, lgr_lock) == 0x68:    BUG: KASAN: null-ptr-deref in _raw_spin_lock_bh+0x79/0xe0   Write of size 4 at addr 0000000000000068 by task exploit/144   Call Trace:    _raw_spin_lock_bh    smc_conn_create (net/smc/smc_core.c:1997)    __smc_connect (net/smc/af_smc.c:1447)    smc_connect (net/smc/af_smc.c:1720)    __sys_connect    __x64_sys_connect    do_syscall_64  Require ism_dev[i] to be non-NULL before accepting a CHID match.",
  "id": "DEBIAN-CVE-2026-64048",
  "modified": "2026-09-14T16:47:34.933377537Z",
  "published": "2026-07-19T16:17:45.190Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://security-tracker.debian.org/tracker/CVE-2026-64048"
    }
  ],
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    }
  ],
  "upstream": [
    "CVE-2026-64048"
  ]
}