---
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:

  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.  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'
---

## Overview

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.

## 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`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.