CVE-2026-99154 scsi: libiscsi: Reject a negative task index from parse_pdu_itt
- Exploited in the wild
- Not known
- Fix
- Available
What is CVE-2026-99154?
CVE-2026-99154 is a vulnerability in Linux, published on 28 Oct 2026.
Official description
In the Linux kernel, the following vulnerability has been resolved:
scsi: libiscsi: Reject a negative task index from parse_pdu_itt
A transport that implements parse_pdu_itt hands libiscsi an index taken from the PDU, and both lookups bound it from above only:
if (i >= session->cmds_max)
i and cmds_max are both int, so a negative index passes and session->cmds[i] is read from before the array.
be2iscsi produces one. beiscsi_parse_pdu() assigns the raw tag,
*index = (int)itt;
and beiscsi_complete_pdu() forwards an unsolicited NOP-In from the hardware async ring without replacing its ITT, so the value is the target's. It also reports the session's own age rather than the one in the tag, which leaves the age comparison in iscsi_verify_itt() with nothing to reject.
Bound the index from below in both lookups.
Which versions are affected by CVE-2026-99154?
How do I fix CVE-2026-99154?
Upgrade to a fixed version.
Is CVE-2026-99154 being exploited?
There is no known exploitation of CVE-2026-99154 in the wild and no public exploit code.
Sources
Also known as AZL-111290, BELL-CVE-2026-99154, DEBIAN-CVE-2026-99154, GHSA-x6ph-vjqm-9q4f, UBUNTU-CVE-2026-99154.