CVE-2026-74557

Technical Description

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.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References