{
  "cveId": "CVE-2026-90108",
  "url": "https://patchblox.com/security/cve/CVE-2026-90108",
  "summary": "CVE-2026-90108 is fixed in 2 products on 1 platform, first by DEBIAN-CVE-2026-90108, released September 23, 2026. It is not reported as exploited. Patch Radar priority: High.",
  "title": "net/smc: free stashed qentry before overwrite in REQ_ADD_LINK to ADD_LINK transition",
  "description": "In the Linux kernel, the following vulnerability has been resolved:  net/smc: free stashed qentry before overwrite in REQ_ADD_LINK to ADD_LINK transition  When smc_llc_event_handler() transitions the local LLC flow from SMC_LLC_FLOW_REQ_ADD_LINK to SMC_LLC_FLOW_ADD_LINK on arrival of an ADD_LINK request, it calls smc_llc_flow_qentry_set() unconditionally:  \tif (lgr-\u003Ellc_flow_lcl.type == SMC_LLC_FLOW_REQ_ADD_LINK) { \t\tlgr-\u003Ellc_flow_lcl.type = SMC_LLC_FLOW_ADD_LINK; \t\tsmc_llc_flow_qentry_set(\u0026lgr-\u003Ellc_flow_lcl, qentry); \t\t... \t}  A CONFIRM_LINK or ADD_LINK_CONT arriving while flow-\u003Etype is SMC_LLC_FLOW_REQ_ADD_LINK is stashed into flow-\u003Eqentry via the SMC_LLC_CONFIRM_LINK / SMC_LLC_ADD_LINK_CONT handler (which stores into flow-\u003Eqentry for any non-NONE flow type).  When the subsequent ADD_LINK arrives, the REQ_ADD_LINK branch overwrites flow-\u003Eqentry with the new pointer without first freeing the stashed allocation, leaking one kmalloc object.  The stashed entry has no consumer: smc_llc_wait() is only called from llc_add_link_work, which is not yet scheduled while the flow type remains REQ_ADD_LINK.  No waiter is sleeping on llc_msg_waiter at this point. It is safe to unconditionally free any stashed qentry before the overwrite.  Call smc_llc_flow_qentry_del() before smc_llc_flow_qentry_set() in the REQ_ADD_LINK branch.  smc_llc_flow_qentry_del() already checks flow-\u003Eqentry before freeing, so the normal path where no entry is stashed is a no-op.",
  "published": "2026-09-17T17:17:02Z",
  "severity": "Moderate",
  "cvss": 7.1,
  "epss": 0.00206,
  "epssPercentile": 0.10668,
  "priority": "High",
  "priorityTier": 3,
  "exploited": false,
  "vendorExploited": false,
  "disclosed": false,
  "vendorAdvisory": "https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-90108",
  "fixes": [
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "6.1.190-1",
      "fix": "DEBIAN-CVE-2026-90108",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-90108",
      "released": "2026-09-23T19:19:02Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 13.5 (trixie)",
      "fixedVersion": "6.12.111-1",
      "fix": "DEBIAN-CVE-2026-90108",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-90108",
      "released": "2026-09-23T19:19:02Z"
    },
    {
      "platform": "linux",
      "product": "linux",
      "release": "Debian 14",
      "fixedVersion": "7.2.6-1",
      "fix": "DEBIAN-CVE-2026-90108",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-90108",
      "released": "2026-09-23T19:19:02Z"
    },
    {
      "platform": "linux",
      "product": "linux-6.12",
      "release": "Debian 12.15 (bookworm)",
      "fixedVersion": "6.12.111-1~deb12u1",
      "fix": "DEBIAN-CVE-2026-90108",
      "url": "https://patchblox.com/security/fix/linux/debian-cve-2026-90108",
      "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"
  }
}