FKIE_CVE-2026-98479

Vulnerability from fkie_nvd - Published: 2026-10-18 16:16 - Updated: 2026-10-24 14:16
Severity
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Summary
In the Linux kernel, the following vulnerability has been resolved: scsi: libiscsi_tcp: Check the data direction of a Data-In PDU The Data-In branch of iscsi_tcp_hdr_dissect() resolves the ITT to a task and copies the PDU's data segment into that command's scatterlist without asking whether the command was reading. iscsi_tcp_r2t_rsp() in the same file does ask, and rejects an R2T for a command that is not DMA_TO_DEVICE. A target that answers a WRITE command's ITT with a Data-In therefore has the initiator write target-supplied bytes into the pages that write was about to send. Those are the caller's own pinned pages for an O_DIRECT write, and page cache pages for a buffered one. Observed against a test target that emits one 512-byte Data-In naming a 128 KB write's ITT, after the R2T for that write. With O_DIRECT the caller's buffer ends up holding 512 bytes of the target's data while pwrite() returns 131072. Buffered is quieter: pwrite() and fsync() both succeed, nothing is logged, and reading those blocks back returns the target's bytes out of the page cache without a command going on the wire. Check the direction before using the scatterlist, the way the R2T path already does.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/24ffc919467d20951f0f132d1c75294e2e91e09b
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/79991b770fc3685b1d5cf805b659a879edd19931
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/8db1232945bc663fb94f300090a1fc108de99296
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/94e5bdd08e51c450d954bc592f591c233ca5c9df
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/bce07e2f37b5e4a427d36fd6b1c14067b27591db
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/de96dc11aee0d058927bff94a168e3c5c46483e2
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e3b25bf2cf2496e85bc05b33360faf9fdf880e03
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/ee56b5e18f566c0b5a183379dcd63d402cebf2f8
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/scsi/libiscsi_tcp.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "79991b770fc3685b1d5cf805b659a879edd19931",
              "status": "affected",
              "version": "a081c13e39b5c17052a7b46fafa61019c4c110ff",
              "versionType": "git"
            },
            {
              "lessThan": "8db1232945bc663fb94f300090a1fc108de99296",
              "status": "affected",
              "version": "a081c13e39b5c17052a7b46fafa61019c4c110ff",
              "versionType": "git"
            },
            {
              "lessThan": "94e5bdd08e51c450d954bc592f591c233ca5c9df",
              "status": "affected",
              "version": "a081c13e39b5c17052a7b46fafa61019c4c110ff",
              "versionType": "git"
            },
            {
              "lessThan": "de96dc11aee0d058927bff94a168e3c5c46483e2",
              "status": "affected",
              "version": "a081c13e39b5c17052a7b46fafa61019c4c110ff",
              "versionType": "git"
            },
            {
              "lessThan": "e3b25bf2cf2496e85bc05b33360faf9fdf880e03",
              "status": "affected",
              "version": "a081c13e39b5c17052a7b46fafa61019c4c110ff",
              "versionType": "git"
            },
            {
              "lessThan": "ee56b5e18f566c0b5a183379dcd63d402cebf2f8",
              "status": "affected",
              "version": "a081c13e39b5c17052a7b46fafa61019c4c110ff",
              "versionType": "git"
            },
            {
              "lessThan": "24ffc919467d20951f0f132d1c75294e2e91e09b",
              "status": "affected",
              "version": "a081c13e39b5c17052a7b46fafa61019c4c110ff",
              "versionType": "git"
            },
            {
              "lessThan": "bce07e2f37b5e4a427d36fd6b1c14067b27591db",
              "status": "affected",
              "version": "a081c13e39b5c17052a7b46fafa61019c4c110ff",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/scsi/libiscsi_tcp.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.29"
            },
            {
              "lessThan": "2.6.29",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.271",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.222",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.189",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.158",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.112",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.55",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.9",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: libiscsi_tcp: Check the data direction of a Data-In PDU\n\nThe Data-In branch of iscsi_tcp_hdr_dissect() resolves the ITT to a task\nand copies the PDU\u0027s data segment into that command\u0027s scatterlist without\nasking whether the command was reading. iscsi_tcp_r2t_rsp() in the same\nfile does ask, and rejects an R2T for a command that is not DMA_TO_DEVICE.\n\nA target that answers a WRITE command\u0027s ITT with a Data-In therefore has\nthe initiator write target-supplied bytes into the pages that write was\nabout to send. Those are the caller\u0027s own pinned pages for an O_DIRECT\nwrite, and page cache pages for a buffered one.\n\nObserved against a test target that emits one 512-byte Data-In naming a 128\nKB write\u0027s ITT, after the R2T for that write. With O_DIRECT the caller\u0027s\nbuffer ends up holding 512 bytes of the target\u0027s data while pwrite()\nreturns 131072. Buffered is quieter: pwrite() and fsync() both succeed,\nnothing is logged, and reading those blocks back returns the target\u0027s bytes\nout of the page cache without a command going on the wire.\n\nCheck the direction before using the scatterlist, the way the R2T path\nalready does."
    }
  ],
  "id": "CVE-2026-98479",
  "lastModified": "2026-10-24T14:16:43.610",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 7.5,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "NONE",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 3.6,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-10-18T16:16:58.467",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/24ffc919467d20951f0f132d1c75294e2e91e09b"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/79991b770fc3685b1d5cf805b659a879edd19931"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/8db1232945bc663fb94f300090a1fc108de99296"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/94e5bdd08e51c450d954bc592f591c233ca5c9df"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/bce07e2f37b5e4a427d36fd6b1c14067b27591db"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/de96dc11aee0d058927bff94a168e3c5c46483e2"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/e3b25bf2cf2496e85bc05b33360faf9fdf880e03"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/ee56b5e18f566c0b5a183379dcd63d402cebf2f8"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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