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CVE.org (no NVD analysis yet)· CNA Linux

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

Noroxi assessment

Priority: Monitor (action score 39/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.51% (FIRST EPSS).
  • Anyone who can reach it over the internet can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Linux Linux 0eb06ebbbecb122f0df9a1f7f623f5255be741ed, 24bd9ba431b2daa263f3551bc2f09f6b4487f5ae, 35b60549a956237488c89a2d85352e026e7d55b7; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 Release Notes; azl3 kernel 6.6.159.1-1 on Azure Linux 3.0 Release Notes.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 0eb06ebbbecb122f0df9a1f7f623f5255be741ed, 24bd9ba431b2daa263f3551bc2f09f6b4487f5ae, 35b60549a956237488c89a2d85352e026e7d55b7; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 Release Notes; azl3 kernel 6.6.159.1-1 on Azure Linux 3.0 Release Notes or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

CriticalCVSS 9.8 · v3.1—No exploit Fix available
Published
Oct 28, 2026
Updated
Oct 31, 2026
EPSS
0.5% · 43th percentile
CWE
—

Report tools

JSON

Action score

39

Monitor

Low priority for now.

CVSS
39 / 40 · 9.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.5%

CNA vs NVD score

NVD
—
CNA · Linux
9.8
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

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  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

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When you'll hear from us

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  • when exploit code appears or is weaponized
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  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 2.6.33affected
    • bfead3b2cb4607c71831423c3ee97d22cd0c9dcb and later · before 24bd9ba431b2daa263f3551bc2f09f6b4487f5aeaffected · git
    • bfead3b2cb4607c71831423c3ee97d22cd0c9dcb and later · before f8fabe1fe044f86abc42194b8f86dfd70212115faffected · git
    • bfead3b2cb4607c71831423c3ee97d22cd0c9dcb and later · before e896a97f336c5edfc13066b57ed431cb3f64e68caffected · git
    • bfead3b2cb4607c71831423c3ee97d22cd0c9dcb and later · before 6200fb2de579f268742a77b0f3d823cb0a8b1947affected · git
    • bfead3b2cb4607c71831423c3ee97d22cd0c9dcb and later · before 0eb06ebbbecb122f0df9a1f7f623f5255be741edaffected · git
    • bfead3b2cb4607c71831423c3ee97d22cd0c9dcb and later · before 6cadfa6f1f5896632d4223d3b7addb2a29fea74eaffected · git
    • bfead3b2cb4607c71831423c3ee97d22cd0c9dcb and later · before 35b60549a956237488c89a2d85352e026e7d55b7affected · git
    • bfead3b2cb4607c71831423c3ee97d22cd0c9dcb and later · before 8ee2a09a1dbb257c9e828ad2497f8e4832dfb142affected · git
    • before 2.6.33not affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxfrom 0—
Debian:13linuxbefore 6.12.115-26.12.115-2

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2026-99152Oct 28, 2026 · scsi: libiscsi: Validate the task named by a management response
    30Monitor
  • ← EarlierCVE-2026-99153Oct 28, 2026 · scsi: libiscsi: Validate the ITT reflected in a Reject PDU
    39Monitor
  • Later →CVE-2026-99155Oct 28, 2026 · scsi: xen/scsifront: Check for a NULL shadow entry on a backend response
    0Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux0eb06ebbbecb122f0df9a1f7f623f5255be741edVendor (CNA)
Linux Linux24bd9ba431b2daa263f3551bc2f09f6b4487f5aeVendor (CNA)
Linux Linux35b60549a956237488c89a2d85352e026e7d55b7Vendor (CNA)
Linux Linux6200fb2de579f268742a77b0f3d823cb0a8b1947Vendor (CNA)
Linux Linux6cadfa6f1f5896632d4223d3b7addb2a29fea74eVendor (CNA)
Linux Linux8ee2a09a1dbb257c9e828ad2497f8e4832dfb142Vendor (CNA)
Linux Linuxe896a97f336c5edfc13066b57ed431cb3f64e68cVendor (CNA)
Linux Linuxf8fabe1fe044f86abc42194b8f86dfd70212115fVendor (CNA)
azl3 kernel 6.6.157.1-1 on Azure Linux 3.0Release NotesMicrosoft (MSRC)
azl3 kernel 6.6.159.1-1 on Azure Linux 3.0Release NotesMicrosoft (MSRC)
debian:linux6.12.115-2 · Debian:13Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

  1. Published
  2. Fix recordedsame day
  3. TodayNov 5, 2026+8 d
EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

—

CVSS vector

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

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. CVSS— → 9.8
  2. Severity— → critical
  3. Exploit maturity— → none
  4. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (7 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records