{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "91edfca6f8b364d60cde3ddefaf7d03ddf35774b"
            },
            {
              "fixed": "22ec7a9fe9153d2737ee9b2fa6d2e43a1491decf"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "fda871c0ba5d2eed2cd1c881573168129da70058"
            },
            {
              "fixed": "ba35b1c674ca3841c0dfadd698f2c1b3ec542d4e"
            },
            {
              "fixed": "c7874dad84b20433c0fe3919f291a762d40de08b"
            },
            {
              "fixed": "e602c93b25bda4a9d0ff1791a4bdbfdcbb074af1"
            },
            {
              "fixed": "d306da8833e75f669d93424fd84940236f3850bc"
            },
            {
              "fixed": "2ed3c9d955e8cd6361f130623baa664a75fb345f"
            },
            {
              "fixed": "4606467a75cfc16721937272ed29462a750b60c8"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "last_affected": "4b17476d809273617d3317fa0d4ae78aa488d760"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "5.10.20"
            },
            {
              "fixed": "5.10.261"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        },
        {
          "events": [
            {
              "introduced": "5.11.3"
            },
            {
              "fixed": "5.12"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "5.10.261"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.11.0"
            },
            {
              "fixed": "5.15.212"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.12.0"
            },
            {
              "fixed": "6.1.178"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "5.16.0"
            },
            {
              "fixed": "6.6.145"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.2.0"
            },
            {
              "fixed": "6.12.97"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.7.0"
            },
            {
              "fixed": "6.18.40"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64534.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nnvmet-tcp: check INIT_FAILED before nvmet_req_uninit in digest error path\n\nIn nvmet_tcp_try_recv_ddgst(), when a data digest mismatch is detected,\nnvmet_req_uninit() is called unconditionally. However, if the command\narrived via the nvmet_tcp_handle_req_failure() path, nvmet_req_init()\nhad returned false and percpu_ref_tryget_live() was never executed. The\nunconditional percpu_ref_put() inside nvmet_req_uninit() then causes a\nrefcount underflow, leading to a WARNING in\npercpu_ref_switch_to_atomic_rcu, a use-after-free diagnostic, and\neventually a permanent workqueue deadlock.\n\nCheck cmd-\u003eflags \u0026 NVMET_TCP_F_INIT_FAILED before calling\nnvmet_req_uninit(), matching the existing pattern in\nnvmet_tcp_execute_request().",
  "id": "CVE-2026-64534",
  "modified": "2026-08-12T03:51:48.838968716Z",
  "published": "2026-07-27T06:32:34.301Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/22ec7a9fe9153d2737ee9b2fa6d2e43a1491decf"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2ed3c9d955e8cd6361f130623baa664a75fb345f"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4606467a75cfc16721937272ed29462a750b60c8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ba35b1c674ca3841c0dfadd698f2c1b3ec542d4e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/c7874dad84b20433c0fe3919f291a762d40de08b"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d306da8833e75f669d93424fd84940236f3850bc"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e602c93b25bda4a9d0ff1791a4bdbfdcbb074af1"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64534.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-64534"
    },
    {
      "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:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ],
  "summary": "nvmet-tcp: check INIT_FAILED before nvmet_req_uninit in digest error path"
}