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nvmet-tcp: check INIT_FAILED before nvmet_req_uninit in digest error path

Type: advisorySource: Official CVE List1 source record

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().

Announced Group revision 1
Original source ↗

CVE-2026-64534

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-64534

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "91edfca6f8b364d60cde3ddefaf7d03ddf35774b",
        "lessThan": "22ec7a9fe9153d2737ee9b2fa6d2e43a1491decf",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "fda871c0ba5d2eed2cd1c881573168129da70058",
        "lessThan": "ba35b1c674ca3841c0dfadd698f2c1b3ec542d4e",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "fda871c0ba5d2eed2cd1c881573168129da70058",
        "lessThan": "c7874dad84b20433c0fe3919f291a762d40de08b",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "fda871c0ba5d2eed2cd1c881573168129da70058",
        "lessThan": "e602c93b25bda4a9d0ff1791a4bdbfdcbb074af1",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "fda871c0ba5d2eed2cd1c881573168129da70058",
        "lessThan": "d306da8833e75f669d93424fd84940236f3850bc",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "fda871c0ba5d2eed2cd1c881573168129da70058",
        "lessThan": "2ed3c9d955e8cd6361f130623baa664a75fb345f",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "fda871c0ba5d2eed2cd1c881573168129da70058",
        "lessThan": "4606467a75cfc16721937272ed29462a750b60c8",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "4b17476d809273617d3317fa0d4ae78aa488d760",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "5.10.20",
        "lessThan": "5.10.261",
        "versionType": "semver"
      },
      {
        "status": "affected",
        "version": "5.11.3",
        "lessThan": "5.12",
        "versionType": "semver"
      }
    ],
    "programFiles": [
      "drivers/nvme/target/tcp.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "5.12"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "5.12",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.261",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.212",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.178",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.145",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.97",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.40",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.1",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "drivers/nvme/target/tcp.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-64534

Source reference: /cveMetadata/cveId

Publisher severity

critical

Source reference: /containers/cna/metrics

Event
#41070 · Revision 1
Added to Heist Feed
Publisher date
Read the original announcement

Revision history

  1. CVE-2026-64534 · Revision 1Source updated