# CVE-2026-99154: scsi: libiscsi: Reject a negative task index from parse_pdu_itt

CVE-2026-99154 is fixed in linux on 1 platform, first by DEBIAN-CVE-2026-99154, released November 3, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-99154
- Priority: High
- CVSS: 9.8 (Important)
- EPSS: 0.0051
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Oct 28, 2026
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-99154

## 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 13.5 (trixie) | 6.12.115-2 | [DEBIAN-CVE-2026-99154](https://patchblox.com/security/data/fix/linux/debian-cve-2026-99154.md) | Nov 3, 2026 |
| Linux | linux Debian 14 | 7.2.13-1 | [DEBIAN-CVE-2026-99154](https://patchblox.com/security/data/fix/linux/debian-cve-2026-99154.md) | Nov 3, 2026 |

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Data as of 2026-11-08T06:59:42Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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