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scsi: libiscsi: Fix stale-data leak into the SCSI sense buffer

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: scsi: libiscsi: Fix stale-data leak into the SCSI sense buffer iscsi_scsi_cmd_rsp() copies the sense data of a SCSI Response from the target-supplied data segment. The segment carries a 2-byte sense length followed by the sense bytes, so it must hold 2 + senselen bytes, but the bounds check only requires datalen >= senselen: senselen = get_unaligned_be16(data); if (datalen < senselen) goto invalid_datalen; memcpy(sc->sense_buffer, data + 2, min_t(uint16_t, senselen, SCSI_SENSE_BUFFERSIZE)); A target that returns a SCSI Response whose datalen equals senselen (with senselen <= SCSI_SENSE_BUFFERSIZE) makes the memcpy() from data + 2 read up to two bytes past the received data. Those bytes are stale conn->data contents and end up in the command's sense buffer, which is returned to userspace. Account for the 2-byte sense length prefix in the check.

Announced Source revision 1
Original source ↗

CVE-2026-74557

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-2026-74557

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": "7996a778ff8c717cb1a7a294475c59cc8f1e9fb8",
        "lessThan": "812f1ae95b22419422972748f173b0916ee4d621",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "7996a778ff8c717cb1a7a294475c59cc8f1e9fb8",
        "lessThan": "fef6167e8149896cd81bea333fd51b1c91239149",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "7996a778ff8c717cb1a7a294475c59cc8f1e9fb8",
        "lessThan": "baa04572673125e4d5bc309b4077d1cb46cc78d1",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "7996a778ff8c717cb1a7a294475c59cc8f1e9fb8",
        "lessThan": "7567f06abdefb1caf2d836107c4d08c5185c650e",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "7996a778ff8c717cb1a7a294475c59cc8f1e9fb8",
        "lessThan": "60499924faf4ef97e84228c20515218ef121facf",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "7996a778ff8c717cb1a7a294475c59cc8f1e9fb8",
        "lessThan": "3ef209ca0b4b68c75e9a814d90cc916026b5a6ac",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "7996a778ff8c717cb1a7a294475c59cc8f1e9fb8",
        "lessThan": "1f07a897d43c63e6c9458bf77450defef39b5833",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "7996a778ff8c717cb1a7a294475c59cc8f1e9fb8",
        "lessThan": "98b87885de4b7f605533a2860685f5689fce8e82",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "drivers/scsi/libiscsi.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "2.6.18"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "2.6.18",
        "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": "6.1.183",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.151",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.103",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.44",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.1.8",
        "versionType": "semver",
        "lessThanOrEqual": "7.1.*"
      },
      {
        "status": "unaffected",
        "version": "7.2",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "drivers/scsi/libiscsi.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-74557

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#33205 · Revision 1
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Publisher date
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