Vulnerability briefing · 2026-10-28 16:47 IST

CVE-2026-99154

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.

CRITICAL · 9.8Linux

Executive briefing

This record describes a reported software or hardware weakness. The description and CVSS rating are source metadata; practical risk depends on whether your environment uses an affected product/version and whether the vulnerable component is reachable and configured in an exploitable way.

Assessment status: No CISA KEV listing is currently recorded in this local feed. This does not prove the vulnerability is not exploited.

Severity & exploitability

9.8 / 10 CVSS

CVSS vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Attack vectorN
Attack complexityL
Privileges requiredN
User interactionN
ScopeU
Confidentiality impactH
Integrity impactH
Availability impactH

Impacted products and platforms

Specific affected product configurations are not currently available in the NVD record. Review vendor advisories and validate applicability against your asset inventory.

How it works and what it could affect

The NVD description is the authoritative short summary currently available for this record. A detailed technical mechanism is not inferred when the source record does not provide one.

Review the CVSS attack characteristics above to understand whether exploitation is network/local, whether privileges or user interaction are required, and which confidentiality, integrity or availability impacts are scored.

Remediation and recommended response

  1. Identify exposure: compare the affected product and version ranges below with your asset inventory, software bill of materials, endpoint inventory and externally exposed services.
  2. Remediate: review the linked vendor security advisory or patch notes, upgrade to a fixed release, or apply the vendor-provided workaround if an upgrade cannot be completed.
  3. Mitigate while patching: restrict network access to the vulnerable service, disable the affected feature where operationally safe, and monitor vendor/CERT advisories for updated guidance.
  4. Validate: confirm the fixed version or mitigation on representative systems, run a vulnerability rescan, and retain change evidence.

No vendor remediation link has been identified in the available NVD references yet. Check the affected vendor's security advisory portal before applying changes.

Exploit intelligence & references

No CISA KEV match is recorded in the latest successful catalog refresh. This is not a guarantee that public proof-of-concept code or exploitation does not exist.

Sources: NVD and CISA KEV when available. Vendor confirmation remains the final authority for fixed versions and workarounds.

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Threat intelligence, made actionable · CVE data sourced from the NVD