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CVE-2026-99154

CRITICALCVSS 9.8/10EPSS 0.17%

Last modified

CVE-2026-99154 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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. EPSS estimates a 0.17% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1
9.8/10

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

EPSS Probability
0.17%

6.6th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= bfead3b2cb4607c71831423c3ee97d22cd0c9dcb, < 24bd9ba431b2daa263f3551bc2f09f6b4487f5ae; >= bfead3b2cb4607c71831423c3ee97d22cd0c9dcb, < f8fabe1fe044f86abc42194b8f86dfd70212115f; >= bfead3b2cb4607c71831423c3ee97d22cd0c9dcb, < e896a97f336c5edfc13066b57ed431cb3f64e68c; >= bfead3b2cb4607c71831423c3ee97d22cd0c9dcb, < 6200fb2de579f268742a77b0f3d823cb0a8b1947; >= bfead3b2cb4607c71831423c3ee97d22cd0c9dcb, < 0eb06ebbbecb122f0df9a1f7f623f5255be741ed; >= bfead3b2cb4607c71831423c3ee97d22cd0c9dcb, < 6cadfa6f1f5896632d4223d3b7addb2a29fea74e; >= bfead3b2cb4607c71831423c3ee97d22cd0c9dcb, < 35b60549a956237488c89a2d85352e026e7d55b7; >= bfead3b2cb4607c71831423c3ee97d22cd0c9dcb, < 8ee2a09a1dbb257c9e828ad2497f8e4832dfb142
LinuxLinux2.6.33

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is 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.
How severe is CVE-2026-99154?
CVE-2026-99154 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 0.17% probability of exploitation in the next 30 days.
How do I fix CVE-2026-99154?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST