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

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-74557
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-15 13:18:01 UTC
Updated2026-08-17 06:19:53 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

EPSS: 0.001560000 probability, percentile 0.052930000 (date 2026-08-16)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
3.1CNADECLARED7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 7996a778ff8c717cb1a7a294475c59cc8f1e9fb8 7567f06abdefb1caf2d836107c4d08c5185c650e git Not specified
CNA Linux Linux affected 7996a778ff8c717cb1a7a294475c59cc8f1e9fb8 60499924faf4ef97e84228c20515218ef121facf git Not specified
CNA Linux Linux affected 7996a778ff8c717cb1a7a294475c59cc8f1e9fb8 3ef209ca0b4b68c75e9a814d90cc916026b5a6ac git Not specified
CNA Linux Linux affected 7996a778ff8c717cb1a7a294475c59cc8f1e9fb8 1f07a897d43c63e6c9458bf77450defef39b5833 git Not specified
CNA Linux Linux affected 7996a778ff8c717cb1a7a294475c59cc8f1e9fb8 98b87885de4b7f605533a2860685f5689fce8e82 git Not specified
CNA Linux Linux affected 2.6.18 Not specified
CNA Linux Linux unaffected 2.6.18 semver Not specified
CNA Linux Linux unaffected 6.6.151 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.103 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.44 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.8 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/98b87885de4b7f605533a2860685f5689fce8e82 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/60499924faf4ef97e84228c20515218ef121facf 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/3ef209ca0b4b68c75e9a814d90cc916026b5a6ac 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/1f07a897d43c63e6c9458bf77450defef39b5833 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/7567f06abdefb1caf2d836107c4d08c5185c650e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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