{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "155055771704f8cbb5c176a4309b7dc30a50450c"
            },
            {
              "fixed": "610ef81797bb4f709e8675c1d8d093bb9ccdcbd8"
            },
            {
              "fixed": "c0a83f29a24c7e7f8516630848ef6db4c174deed"
            },
            {
              "fixed": "05b8ca493dd02319bca93c640b259c2ba51ef321"
            },
            {
              "fixed": "1fc9c1933959d2776a1ce7bf424251b8b5b586cd"
            },
            {
              "fixed": "4545f355654d044d35a31cd01cc46f491a8a7c36"
            },
            {
              "fixed": "98df2aee1459ee1c62c70cbe9b370d2a532aea36"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "6.0.0"
            },
            {
              "fixed": "6.1.188"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.6.157"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.12.110"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.13.0"
            },
            {
              "fixed": "6.18.52"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.2.6"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90309.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/erdma: Hold CQ references when processing EQ events\n\nEQ handlers look up CQs from dev-\u003ecq_xa and invoke CQ completion or\nerror callbacks outside the xarray lock. erdma_destroy_cq() can erase the\nCQ from the xarray and free its queue buffer and doorbell record while a\npreviously scheduled EQ handler is still using the CQ.\n\nAdd a CQ refcount and take a reference under the xarray lock with\nrefcount_inc_not_zero(). Remove the CQ from the xarray before dropping\nthe destroy-path reference, then wait for in-flight EQ users before\nreleasing CQ resources.",
  "id": "CVE-2026-90309",
  "modified": "2026-09-19T03:30:15.414772094Z",
  "published": "2026-09-17T16:08:30.346Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/05b8ca493dd02319bca93c640b259c2ba51ef321"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/1fc9c1933959d2776a1ce7bf424251b8b5b586cd"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4545f355654d044d35a31cd01cc46f491a8a7c36"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/610ef81797bb4f709e8675c1d8d093bb9ccdcbd8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/98df2aee1459ee1c62c70cbe9b370d2a532aea36"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c0a83f29a24c7e7f8516630848ef6db4c174deed"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/90xxx/CVE-2026-90309.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-90309"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "RDMA/erdma: Hold CQ references when processing EQ events"
}