CVE-2026-64534 (GCVE-0-2026-64534)

Vulnerability from cvelistv5 – Published: 2026-07-27 06:32 – Updated: 2026-10-19 20:48
VLAI
Title
nvmet-tcp: check INIT_FAILED before nvmet_req_uninit in digest error path
Summary
In the Linux kernel, the following vulnerability has been resolved: nvmet-tcp: check INIT_FAILED before nvmet_req_uninit in digest error path In nvmet_tcp_try_recv_ddgst(), when a data digest mismatch is detected, nvmet_req_uninit() is called unconditionally. However, if the command arrived via the nvmet_tcp_handle_req_failure() path, nvmet_req_init() had returned false and percpu_ref_tryget_live() was never executed. The unconditional percpu_ref_put() inside nvmet_req_uninit() then causes a refcount underflow, leading to a WARNING in percpu_ref_switch_to_atomic_rcu, a use-after-free diagnostic, and eventually a permanent workqueue deadlock. Check cmd->flags & NVMET_TCP_F_INIT_FAILED before calling nvmet_req_uninit(), matching the existing pattern in nvmet_tcp_execute_request().
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: yes Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-16 15:41 UTC
CWE
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 7063 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 91edfca6f8b364d60cde3ddefaf7d03ddf35774b , < 22ec7a9fe9153d2737ee9b2fa6d2e43a1491decf (git)
Affected: fda871c0ba5d2eed2cd1c881573168129da70058 , < ba35b1c674ca3841c0dfadd698f2c1b3ec542d4e (git)
Affected: fda871c0ba5d2eed2cd1c881573168129da70058 , < c7874dad84b20433c0fe3919f291a762d40de08b (git)
Affected: fda871c0ba5d2eed2cd1c881573168129da70058 , < e602c93b25bda4a9d0ff1791a4bdbfdcbb074af1 (git)
Affected: fda871c0ba5d2eed2cd1c881573168129da70058 , < d306da8833e75f669d93424fd84940236f3850bc (git)
Affected: fda871c0ba5d2eed2cd1c881573168129da70058 , < 2ed3c9d955e8cd6361f130623baa664a75fb345f (git)
Affected: fda871c0ba5d2eed2cd1c881573168129da70058 , < 4606467a75cfc16721937272ed29462a750b60c8 (git)
Affected: 4b17476d809273617d3317fa0d4ae78aa488d760 (git)
Affected: 5.10.20 , < 5.10.261 (semver)
Affected: 5.11.3 , < 5.12 (semver)
guessed Create a notification for this product.
Linux Linux Affected: 5.12
Unaffected: 0 , < 5.12 (semver)
Unaffected: 5.10.261 , ≤ 5.10.* (semver)
Unaffected: 5.15.212 , ≤ 5.15.* (semver)
Unaffected: 6.1.178 , ≤ 6.1.* (semver)
Unaffected: 6.6.145 , ≤ 6.6.* (semver)
Unaffected: 6.12.97 , ≤ 6.12.* (semver)
Unaffected: 6.18.40 , ≤ 6.18.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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                "confidentialityImpact": "HIGH",
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          },
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          },
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "url": "https://git.kernel.org/stable/c/e602c93b25bda4a9d0ff1791a4bdbfdcbb074af1"
          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received",
        "weaknesses": [
          {
            "description": [
              {
                "lang": "en",
                "value": "CWE-667"
              }
            ],
            "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
            "type": "Secondary"
          }
        ]
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Important",
      "current_release_date": "2026-10-15T20:05:18+00:00",
      "cve": "CVE-2026-64534",
      "id": "CVE-2026-64534",
      "initial_release_date": "2026-07-27T00:00:00+00:00",
      "product_status:fixed": "762",
      "product_status:known_affected": "22",
      "product_status:known_not_affected": "42",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: nvmet-tcp: check INIT_FAILED before nvmet_req_uninit in digest error path",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64534.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-10-17T00:08:32Z",
      "cve": "CVE-2026-64534",
      "id": "CVE-2026-64534",
      "initial_release_date": "2026-07-27T17:00:01Z",
      "product_status:known_affected": "232",
      "product_status:known_not_affected": "147",
      "product_status:recommended": "245",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-64534",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/2026/cve-2026-64534.json",
      "version": "12"
    },
    "vulnrichment": {
      "containers": {
        "adp": [
          {
            "metrics": [
              {
                "other": {
                  "content": {
                    "id": "CVE-2026-64534",
                    "options": [
                      {
                        "Exploitation": "none"
                      },
                      {
                        "Automatable": "yes"
                      },
                      {
                        "Technical Impact": "total"
                      }
                    ],
                    "role": "CISA Coordinator",
                    "timestamp": "2026-10-16T15:41:53.789221Z",
                    "version": "2.0.3"
                  },
                  "type": "ssvc"
                }
              }
            ],
            "problemTypes": [
              {
                "descriptions": [
                  {
                    "cweId": "CWE-667",
                    "description": "CWE-667 Improper Locking",
                    "lang": "en",
                    "type": "CWE"
                  }
                ]
              }
            ],
            "providerMetadata": {
              "dateUpdated": "2026-10-16T15:41:54.334Z",
              "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
              "shortName": "CISA-ADP"
            },
            "title": "CISA ADP Vulnrichment"
          }
        ],
        "cna": {
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            {
              "defaultStatus": "unaffected",
              "product": "Linux",
              "programFiles": [
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            },
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              "product": "Linux",
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              "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
              "vendor": "Linux",
              "versions": [
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                  "version": "5.12"
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                {
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                  "status": "unaffected",
                  "version": "5.15.212",
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                  "version": "6.1.178",
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                },
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                  "status": "unaffected",
                  "version": "7.1",
                  "versionType": "original_commit_for_fix"
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            }
          ],
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                      "vulnerable": true
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                      "vulnerable": true
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              "value": "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()."
            }
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                "baseSeverity": "CRITICAL",
                "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "scenarios": [
                {
                  "lang": "en",
                  "value": "AV:N - The vulnerable NVMe/TCP target receive path processes attacker-supplied ICReq, CapsuleCmd, inline payload, and digest data over an Internet-routable TCP connection.\nAC:L - The attacker can negotiate data digests and reliably send a rejected write command with inline data followed by an incorrect digest; no race or condition outside the attacker\u0027s control is required.\nPR:N - A malformed CapsuleCmd can trigger this path before CONNECT, host-NQN ACL evaluation, or DH-HMAC-CHAP authentication, so the remote attacker needs no credentials or privileges.\nUI:N - The target processes the malicious protocol sequence automatically without any victim action.\nS:U - The vulnerable transport and the affected kernel memory, execution, and storage resources belong to the same target-host security authority.\nC:H - The unmatched reference decrement can offset a legitimate in-flight request reference, allowing command structures and SGL pages to be freed while backend I/O still uses them; this UAF can expose arbitrary reused kernel memory.\nI:H - The premature freeing of request structures and I/O pages can let backend operations write through reallocated memory or corrupt completion control state, making arbitrary kernel writes and control-flow hijacking defensible.\nA:H - The basic trigger causes a submission-queue refcount underflow and permanent workqueue deadlock, while UAF variants can crash the kernel; unauthenticated attackers can repeat the trigger across connections."
                }
              ]
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            "dateUpdated": "2026-08-05T12:42:44.214Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
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              "url": "https://git.kernel.org/stable/c/22ec7a9fe9153d2737ee9b2fa6d2e43a1491decf"
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            },
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              "url": "https://git.kernel.org/stable/c/4606467a75cfc16721937272ed29462a750b60c8"
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        "assignerShortName": "Linux",
        "cveId": "CVE-2026-64534",
        "datePublished": "2026-07-27T06:32:34.301Z",
        "dateReserved": "2026-07-19T15:36:31.795Z",
        "dateUpdated": "2026-10-19T20:48:38.863Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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