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nvmet-tcp: Fix potential UAF when ddgst mismatch

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: nvmet-tcp: Fix potential UAF when ddgst mismatch Shivam Kumar found via vulnerability testing: When data digest is enabled on an NVMe/TCP connection and a digest mismatch occurs on a non-final H2C_DATA PDU during an R2T-based data transfer, the digest error handler in nvmet_tcp_try_recv_ddgst() calls nvmet_req_uninit() — which performs percpu_ref_put() on the submission queue — but does NOT mark the command as completed. It does not set cqe->status, does not modify rbytes_done, and does not clear any flag. When the subsequent fatal error triggers queue teardown, nvmet_tcp_uninit_data_in_cmds() iterates all commands, checks nvmet_tcp_need_data_in() for each one, and finds that the already-uninited command still appears to need data (because rbytes_done < transfer_len and cqe->status == 0). It therefore calls nvmet_req_uninit() a second time on the same command — a double percpu_ref_put against a single percpu_ref_get.

Announced Source revision 1
Original source ↗

CVE-2026-64535

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-2026-64535

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": "dfb902462bca478f050224ec7a7195aafa7643b1",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "fda871c0ba5d2eed2cd1c881573168129da70058",
        "lessThan": "7e558308eba14c8136cb1e615f0c850f76d1fc0a",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "fda871c0ba5d2eed2cd1c881573168129da70058",
        "lessThan": "96fe2513df590e74b04253a45089cae75569570e",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "fda871c0ba5d2eed2cd1c881573168129da70058",
        "lessThan": "e091ff83d962f9ed00d9bd70443676de9fe98bdc",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "fda871c0ba5d2eed2cd1c881573168129da70058",
        "lessThan": "6f9442983a3e4227afd1c83a5251ddbca585ea21",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "fda871c0ba5d2eed2cd1c881573168129da70058",
        "lessThan": "088ee46c18d99baef453afd74181dd40ade044ad",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "fda871c0ba5d2eed2cd1c881573168129da70058",
        "lessThan": "dbbd07d0a7020b80f6a7028e561908f7b83b3d5a",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "4b17476d809273617d3317fa0d4ae78aa488d760",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "5.10.20",
        "lessThan": "5.10.265",
        "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": "5.10.265",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.216",
        "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-2026-64535

Source reference: /cveMetadata/cveId

Publisher severity

critical

Source reference: /containers/cna/metrics

Event
#41071 · Revision 1
Added to Heist Feed
Publisher date
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