# scsi: libiscsi: Reject a negative task index from parse_pdu_itt

CVE record · `CVE-2026-99154`

- **Identifiers:** `CVE-2026-99154`
- **State:** Confirmed
- **Severity:** CVSS 9.8 Critical
- **Critical:** Yes: CVSS 9+
- **CNA:** Linux
- **Technologies:** [Linux kernel](https://agentprime.io/advisories/technology/linux-kernel.md)
- **Published:** 28 Oct 2026
- **Updated:** 31 Oct 2026
- **Reviewed by a person:** No

Published by the CVE Program (CNA: Linux) at 28 Oct 2026, 10:35 UTC. agentprime has not analysed this yet, so whether it affects any app is not known. This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it.

## Critical

Critical, because:

- CVSS score 9.8: 9.0 or more.

How we decide what’s critical: <https://agentprime.io/advisories/critical.md>

## Affected products, as the CNA wrote them

- Vendor: Linux. Product: Linux.
  - affected: `bfead3b2cb4607c71831423c3ee97d22cd0c9dcb to before 24bd9ba431b2daa263f3551bc2f09f6b4487f5ae` (git)
  - affected: `bfead3b2cb4607c71831423c3ee97d22cd0c9dcb to before f8fabe1fe044f86abc42194b8f86dfd70212115f` (git)
  - affected: `bfead3b2cb4607c71831423c3ee97d22cd0c9dcb to before e896a97f336c5edfc13066b57ed431cb3f64e68c` (git)
  - affected: `bfead3b2cb4607c71831423c3ee97d22cd0c9dcb to before 6200fb2de579f268742a77b0f3d823cb0a8b1947` (git)
  - affected: `bfead3b2cb4607c71831423c3ee97d22cd0c9dcb to before 0eb06ebbbecb122f0df9a1f7f623f5255be741ed` (git)
  - affected: `bfead3b2cb4607c71831423c3ee97d22cd0c9dcb to before 6cadfa6f1f5896632d4223d3b7addb2a29fea74e` (git)
  - affected: `bfead3b2cb4607c71831423c3ee97d22cd0c9dcb to before 35b60549a956237488c89a2d85352e026e7d55b7` (git)
  - affected: `bfead3b2cb4607c71831423c3ee97d22cd0c9dcb to before 8ee2a09a1dbb257c9e828ad2497f8e4832dfb142` (git)
  - Other versions: unaffected
- Vendor: Linux. Product: Linux.
  - affected: `2.6.33`
  - unaffected: `before 2.6.33` (semver)
  - unaffected: `5.10.273 to 5.10.*, inclusive` (semver)
  - unaffected: `5.15.224 to 5.15.*, inclusive` (semver)
  - unaffected: `6.1.191 to 6.1.*, inclusive` (semver)
  - unaffected: `6.6.161 to 6.6.*, inclusive` (semver)
  - unaffected: `6.12.115 to 6.12.*, inclusive` (semver)
  - unaffected: `6.18.59 to 6.18.*, inclusive` (semver)
  - unaffected: `7.2.13 to 7.2.*, inclusive` (semver)
  - unaffected: `7.3 to *, inclusive` (original_commit_for_fix)
  - Other versions: affected

## Not analysed yet

We haven’t published our own analysis of this CVE. If a person reviews it, this page will say what’s affected and what has to be true for it to matter.

## Severity and exploitation

- 9.8 Critical, CVSS 3.1: `CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H`, from CNA (Linux)

- **CISA KEV:** Not listed.
- **EPSS:** 0.0051, the 43rd percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.

## Timeline

- 28 Oct 2026, 10:35 UTC: [Confirmed by the CVE List](https://www.cve.org/CVERecord?id=CVE-2026-99154)

## Sources

- [CVE List: CVE-2026-99154](https://www.cve.org/CVERecord?id=CVE-2026-99154)
- [NVD: CVE-2026-99154](https://nvd.nist.gov/vuln/detail/CVE-2026-99154)

### References from the CNA

- <https://git.kernel.org/stable/c/24bd9ba431b2daa263f3551bc2f09f6b4487f5ae>
- <https://git.kernel.org/stable/c/f8fabe1fe044f86abc42194b8f86dfd70212115f>
- <https://git.kernel.org/stable/c/e896a97f336c5edfc13066b57ed431cb3f64e68c>
- <https://git.kernel.org/stable/c/6200fb2de579f268742a77b0f3d823cb0a8b1947>
- <https://git.kernel.org/stable/c/0eb06ebbbecb122f0df9a1f7f623f5255be741ed>
- <https://git.kernel.org/stable/c/6cadfa6f1f5896632d4223d3b7addb2a29fea74e>
- <https://git.kernel.org/stable/c/35b60549a956237488c89a2d85352e026e7d55b7>
- <https://git.kernel.org/stable/c/8ee2a09a1dbb257c9e828ad2497f8e4832dfb142>

Facts on this page come from the CVE List as the CNA published them, with CVSS from the sources named above, CISA KEV and FIRST EPSS. Vendors, products and versions are shown as the CNA wrote them. We don’t reproduce the CVE’s description.

## Check whether this affects you

This CVE names a vendor and product rather than a package, so the lockfile check doesn’t match it. Compare the affected versions above with what you run.

- With the agentprime MCP server (<https://api.agentprime.io/mcp>), `get_advisory` returns this record and `search_advisories` finds related ones. Setup: <https://agentprime.io/mcp.md>
- As JSON: <https://api.agentprime.io/v1/advisories/CVE-2026-99154>
- Everything that needs attention now: <https://agentprime.io/advisories/critical.md>

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The web page: <https://agentprime.io/advisories/CVE-2026-99154/>. Everything for agents: <https://agentprime.io/llms.txt>.