CVE-2026-74557 (GCVE-0-2026-74557)
Vulnerability from cvelistv5
Published
2026-08-15 12:28
Modified
2026-10-16 19:05
Severity ?
7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Summary
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: 7996a778ff8c717cb1a7a294475c59cc8f1e9fb8
Version: 7996a778ff8c717cb1a7a294475c59cc8f1e9fb8
Version: 7996a778ff8c717cb1a7a294475c59cc8f1e9fb8
Version: 7996a778ff8c717cb1a7a294475c59cc8f1e9fb8
Version: 7996a778ff8c717cb1a7a294475c59cc8f1e9fb8
Version: 7996a778ff8c717cb1a7a294475c59cc8f1e9fb8
Version: 7996a778ff8c717cb1a7a294475c59cc8f1e9fb8
Version: 7996a778ff8c717cb1a7a294475c59cc8f1e9fb8
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The segment carries a 2-byte sense length\\nfollowed by the sense bytes, so it must hold 2 + senselen bytes, but the\\nbounds check only requires datalen \u003e= senselen:\\n\\n\\tsenselen = get_unaligned_be16(data);\\n\\tif (datalen \u003c senselen)\\n\\t\\tgoto invalid_datalen;\\n\\tmemcpy(sc-\u003esense_buffer, data + 2,\\n\\t       min_t(uint16_t, senselen, SCSI_SENSE_BUFFERSIZE));\\n\\nA target that returns a SCSI Response whose datalen equals senselen\\n(with senselen \u003c= SCSI_SENSE_BUFFERSIZE) makes the memcpy() from data +\\n2 read up to two bytes past the received data.  Those bytes are stale\\nconn-\u003edata contents and end up in the command\u0027s sense buffer, which is\\nreturned to userspace.\\n\\nAccount for the 2-byte sense length prefix in the check.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.265\", \"versionStartIncluding\": \"2.6.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.216\", \"versionStartIncluding\": \"2.6.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.183\", \"versionStartIncluding\": \"2.6.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.151\", \"versionStartIncluding\": \"2.6.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.103\", \"versionStartIncluding\": \"2.6.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.44\", \"versionStartIncluding\": \"2.6.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.1.8\", \"versionStartIncluding\": \"2.6.18\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.2\", \"versionStartIncluding\": \"2.6.18\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-19T16:38:59.951Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-74557\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-16T19:05:55.724Z\", \"dateReserved\": \"2026-08-15T05:44:03.916Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-08-15T12:28:01.988Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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