CVE-2026-98479 (GCVE-0-2026-98479)

Vulnerability from cvelistv5 – Published: 2026-10-18 15:15 – Updated: 2026-10-24 14:09
VLAI
Title
scsi: libiscsi_tcp: Check the data direction of a Data-In PDU
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.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6639 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: a081c13e39b5c17052a7b46fafa61019c4c110ff , < 79991b770fc3685b1d5cf805b659a879edd19931 (git)
Affected: a081c13e39b5c17052a7b46fafa61019c4c110ff , < 8db1232945bc663fb94f300090a1fc108de99296 (git)
Affected: a081c13e39b5c17052a7b46fafa61019c4c110ff , < 94e5bdd08e51c450d954bc592f591c233ca5c9df (git)
Affected: a081c13e39b5c17052a7b46fafa61019c4c110ff , < de96dc11aee0d058927bff94a168e3c5c46483e2 (git)
Affected: a081c13e39b5c17052a7b46fafa61019c4c110ff , < e3b25bf2cf2496e85bc05b33360faf9fdf880e03 (git)
Affected: a081c13e39b5c17052a7b46fafa61019c4c110ff , < ee56b5e18f566c0b5a183379dcd63d402cebf2f8 (git)
Affected: a081c13e39b5c17052a7b46fafa61019c4c110ff , < 24ffc919467d20951f0f132d1c75294e2e91e09b (git)
Affected: a081c13e39b5c17052a7b46fafa61019c4c110ff , < bce07e2f37b5e4a427d36fd6b1c14067b27591db (git)
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Linux Linux Affected: 2.6.29
Unaffected: 0 , < 2.6.29 (semver)
Unaffected: 5.10.271 , ≤ 5.10.* (semver)
Unaffected: 5.15.222 , ≤ 5.15.* (semver)
Unaffected: 6.1.189 , ≤ 6.1.* (semver)
Unaffected: 6.6.158 , ≤ 6.6.* (semver)
Unaffected: 6.12.112 , ≤ 6.12.* (semver)
Unaffected: 6.18.55 , ≤ 6.18.* (semver)
Unaffected: 7.2.9 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
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{
  "containers": {
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          "product": "Linux",
          "programFiles": [
            "drivers/scsi/libiscsi_tcp.c"
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      "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."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - A remote iSCSI target supplies the malicious SCSI Data-In PDU over routable TCP; iscsi_sw_tcp_data_ready() reaches iscsi_tcp_recv_skb(), iscsi_tcp_hdr_dissect(), and the patched iscsi_tcp_data_in().\nAC:L - iscsi_prep_scsi_cmd_pdu() exposes the live WRITE ITT to the target, which can deterministically return a Data-In with that ITT, the expected DataSN, and an in-range offset and length; no race or outside condition is required.\nPR:N - The receive path imposes no privilege or per-PDU authentication check on the connected target; iscsi_verify_itt() only validates the ITT\u0027s session age and index, and the target learns that ITT from the WRITE command.\nUI:N - After iscsi_queuecommand() submits an ordinary WRITE on a logged-in session, the target\u0027s Data-In is processed automatically by the TCP callback; exploitation requires no user approval or opening of attacker-supplied content.\nS:U - iscsi_tcp_hdr_dissect() redirects data into task-\u003esc-\u003esdb, affecting the initiator\u0027s caller pages or page cache under the same host-kernel security authority, without crossing a VM, IOMMU, or sandbox boundary.\nC:N - iscsi_tcp_segment_recv() only copies target-supplied bytes into the command scatterlist; this defect provides no path for reading initiator memory or returning unintended bytes to the target.\nI:H - iscsi_segment_seek_sg() makes the receive segment reference a WRITE command\u0027s sdb, after which iscsi_tcp_segment_recv() copies attacker-chosen bytes into an O_DIRECT caller buffer or buffered-write page-cache pages.\nA:N - iscsi_tcp_data_in() bounds the offset and DataSegmentLength to sdb.length, and iscsi_segment_seek_sg() rejects offsets outside the scatterlist; the demonstrated effect is silent bounded data corruption, not an oops, hang, or resource exhaustion."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-24T14:09:01.805Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        {
          "url": "https://git.kernel.org/stable/c/bce07e2f37b5e4a427d36fd6b1c14067b27591db"
        }
      ],
      "title": "scsi: libiscsi_tcp: Check the data direction of a Data-In PDU",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
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  "cveMetadata": {
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-98479",
    "datePublished": "2026-10-18T15:15:53.663Z",
    "dateReserved": "2026-09-25T10:25:14.351Z",
    "dateUpdated": "2026-10-24T14:09:01.805Z",
    "state": "PUBLISHED"
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  "dataVersion": "5.2",
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      "date": "2026-11-09",
      "epss": "0.00392",
      "percentile": "0.33588"
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    "microsoft_vex": {
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      "cve": "CVE-2026-98479",
      "id": "msrc_CVE-2026-98479",
      "initial_release_date": "2026-10-20T01:09:34.000Z",
      "product_status:fixed": "1",
      "product_status:known_affected": "1",
      "product_status:under_investigation": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "scsi: libiscsi_tcp: Check the data direction of a Data-In PDU",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-98479.json",
      "version": "4"
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        "descriptions": [
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            "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"
          },
          {
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          },
          {
            "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"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-11-07T11:30:13+00:00",
      "cve": "CVE-2026-98479",
      "id": "CVE-2026-98479",
      "initial_release_date": "2026-10-18T00:00:00+00:00",
      "product_status:known_affected": "203",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: scsi: libiscsi_tcp: Check the data direction of a Data-In PDU",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-98479.json",
      "version": "3"
    }
  }
}



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Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.

Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline

Sightings and recorded dates, grouped by day · UTC

JSON
How durations are calculated

Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.

Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.

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    Related by attack behaviour

    Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.