{"id":"CVE-2026-74557","title":"scsi: libiscsi: Fix stale-data leak into the SCSI sense buffer","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: libiscsi: Fix stale-data leak into the SCSI sense buffer\n\niscsi_scsi_cmd_rsp() copies the sense data of a SCSI Response from the\ntarget-supplied data segment.  Th…","severity":"high","cvss":7.5,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","cvssSource":"cna","vendor":"Linux","product":"Linux","affected":["Linux >= 7996a778ff8c717cb1a7a294475c59cc8f1e9fb8 < 812f1ae95b22419422972748f173b0916ee4d621","Linux >= 7996a778ff8c717cb1a7a294475c59cc8f1e9fb8 < fef6167e8149896cd81bea333fd51b1c91239149","Linux >= 7996a778ff8c717cb1a7a294475c59cc8f1e9fb8 < baa04572673125e4d5bc309b4077d1cb46cc78d1","Linux >= 7996a778ff8c717cb1a7a294475c59cc8f1e9fb8 < 7567f06abdefb1caf2d836107c4d08c5185c650e","Linux >= 7996a778ff8c717cb1a7a294475c59cc8f1e9fb8 < 60499924faf4ef97e84228c20515218ef121facf","Linux >= 7996a778ff8c717cb1a7a294475c59cc8f1e9fb8 < 3ef209ca0b4b68c75e9a814d90cc916026b5a6ac","Linux >= 7996a778ff8c717cb1a7a294475c59cc8f1e9fb8 < 1f07a897d43c63e6c9458bf77450defef39b5833","Linux >= 7996a778ff8c717cb1a7a294475c59cc8f1e9fb8 < 98b87885de4b7f605533a2860685f5689fce8e82","Linux 2.6.18"],"ssvc":{"exploitation":"none","automatable":"yes","technicalImpact":"partial","timestamp":"2026-10-16T19:00:09.303445Z"},"published":"2026-08-15","updated":"2026-10-16","sourceUpdated":"2026-10-16T19:05:55.724Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-74557","references":[{"url":"https://git.kernel.org/stable/c/812f1ae95b22419422972748f173b0916ee4d621"},{"url":"https://git.kernel.org/stable/c/fef6167e8149896cd81bea333fd51b1c91239149"},{"url":"https://git.kernel.org/stable/c/baa04572673125e4d5bc309b4077d1cb46cc78d1"},{"url":"https://git.kernel.org/stable/c/7567f06abdefb1caf2d836107c4d08c5185c650e"},{"url":"https://git.kernel.org/stable/c/60499924faf4ef97e84228c20515218ef121facf"},{"url":"https://git.kernel.org/stable/c/3ef209ca0b4b68c75e9a814d90cc916026b5a6ac"},{"url":"https://git.kernel.org/stable/c/1f07a897d43c63e6c9458bf77450defef39b5833"},{"url":"https://git.kernel.org/stable/c/98b87885de4b7f605533a2860685f5689fce8e82"}],"tags":["cve.org"],"epss":0.00329,"epssPercentile":0.24446,"ingestedAt":"2026-10-16T19:46:24.343Z","slug":"CVE-2026-74557","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\nscsi: libiscsi: Fix stale-data leak into the SCSI sense buffer\n\niscsi_scsi_cmd_rsp() copies the sense data of a SCSI Response from the\ntarget-supplied data segment.  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 >= senselen:\n\n\tsenselen = get_unaligned_be16(data);\n\tif (datalen < senselen)\n\t\tgoto invalid_datalen;\n\tmemcpy(sc->sense_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 <= SCSI_SENSE_BUFFERSIZE) makes the memcpy() from data +\n2 read up to two bytes past the received data.  Those bytes are stale\nconn->data contents and end up in the command's sense buffer, which is\nreturned to userspace.\n\nAccount for the 2-byte sense length prefix in the check.\n\n## Affected\n\n- `Linux >= 7996a778ff8c717cb1a7a294475c59cc8f1e9fb8 < 812f1ae95b22419422972748f173b0916ee4d621`\n- `Linux >= 7996a778ff8c717cb1a7a294475c59cc8f1e9fb8 < fef6167e8149896cd81bea333fd51b1c91239149`\n- `Linux >= 7996a778ff8c717cb1a7a294475c59cc8f1e9fb8 < baa04572673125e4d5bc309b4077d1cb46cc78d1`\n- `Linux >= 7996a778ff8c717cb1a7a294475c59cc8f1e9fb8 < 7567f06abdefb1caf2d836107c4d08c5185c650e`\n- `Linux >= 7996a778ff8c717cb1a7a294475c59cc8f1e9fb8 < 60499924faf4ef97e84228c20515218ef121facf`\n- `Linux >= 7996a778ff8c717cb1a7a294475c59cc8f1e9fb8 < 3ef209ca0b4b68c75e9a814d90cc916026b5a6ac`\n- `Linux >= 7996a778ff8c717cb1a7a294475c59cc8f1e9fb8 < 1f07a897d43c63e6c9458bf77450defef39b5833`\n- `Linux >= 7996a778ff8c717cb1a7a294475c59cc8f1e9fb8 < 98b87885de4b7f605533a2860685f5689fce8e82`\n- `Linux 2.6.18`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":41,"depthScoreParts":{"impact":41.3,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}