CVE-2026-74557

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.

Affected Software

Weaknesses

References

• https://git.kernel.org/stable/c/7567f06abdefb1caf2d836107c4d08c5185c650e
• https://git.kernel.org/stable/c/60499924faf4ef97e84228c20515218ef121facf
• https://git.kernel.org/stable/c/3ef209ca0b4b68c75e9a814d90cc916026b5a6ac
• https://git.kernel.org/stable/c/1f07a897d43c63e6c9458bf77450defef39b5833
• https://git.kernel.org/stable/c/98b87885de4b7f605533a2860685f5689fce8e82

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