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nvmet-tcp: fix out-of-bounds write when receiving an over-long PDU

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: nvmet-tcp: fix out-of-bounds write when receiving an over-long PDU nvmet_tcp_try_recv_pdu() reads a PDU header into the fixed 128-byte queue->pdu union, then computes the remaining payload length as queue->left = hdr->hlen - queue->offset + hdgst; and reads that many more bytes into &queue->pdu + queue->offset, without ever bounding the result against sizeof(queue->pdu). A struct nvme_tcp_icreq_pdu is itself 128 bytes, exactly the size of the union. Once a header digest has been negotiated (hdgst = 4), a second ICReq passes the hlen == nvmet_tcp_pdu_size() check but yields queue->left = 128 - 8 + 4 = 124, so bytes 8..132 are written into the 128-byte buffer -- 4 bytes past its end, over queue->hdr_digest and queue->data_digest. Those bytes are attacker-controlled (an ICReq carries no digest), and the duplicate ICReq is only rejected later, after the overflow. A remote unauthenticated host can thus corrupt kernel memory adjacent to the receive buffer. Reject any PDU whose declared length would read past the end of queue->pdu before the second recv.

Announced Source revision 1
Original source ↗

CVE-2026-89969

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-2026-89969

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": "872d26a391da92ed8f0c0f5cb5fef428067b7f30",
        "lessThan": "a3f0bcfbaf3312a5754d1ce020a07d394669eb25",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "872d26a391da92ed8f0c0f5cb5fef428067b7f30",
        "lessThan": "4f84d42c53c49557fb1ef285c683b0a81b576c74",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "872d26a391da92ed8f0c0f5cb5fef428067b7f30",
        "lessThan": "58dc6035b79c4c73c0cbf9ec9f68a7f117b2b3e6",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "872d26a391da92ed8f0c0f5cb5fef428067b7f30",
        "lessThan": "cf5f39d2b58f97e0cd1829c4a6aeef17f1607cca",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "872d26a391da92ed8f0c0f5cb5fef428067b7f30",
        "lessThan": "3a385e0c39efbe34db8edd95900c123113ae3450",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "872d26a391da92ed8f0c0f5cb5fef428067b7f30",
        "lessThan": "dbc4acbdb3ca8c81441368ad7409b8f77d4de8f6",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "872d26a391da92ed8f0c0f5cb5fef428067b7f30",
        "lessThan": "d95d342bc0ea82dc79e6362b2f1f997431750e4c",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "872d26a391da92ed8f0c0f5cb5fef428067b7f30",
        "lessThan": "14cc5a7e77731497d5bea70f3bb05df7eda982e4",
        "versionType": "git"
      }
    ],
    "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": "5.0"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "5.0",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.270",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.221",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.188",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.157",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.110",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.51",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.2.5",
        "versionType": "semver",
        "lessThanOrEqual": "7.2.*"
      },
      {
        "status": "unaffected",
        "version": "7.3",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "drivers/nvme/target/tcp.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-89969

Source reference: /cveMetadata/cveId

Publisher severity

critical

Source reference: /containers/cna/metrics

Event
#36408 · Revision 1
Added to Heist Feed
Publisher date
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