CVE-2026-99154: scsi: libiscsi: Reject a negative task index from parse_pdu_itt
- Is it exploited?
Not on CISA's list. CISA has not added it to the Known Exploited Vulnerabilities catalog as of . If CISA adds it, this page shows it as known exploited.
- How likely is exploitation in the next 30 days?
- 0.2%
EPSS score, percentile 7.9 of all scored records. A probability estimated by FIRST, not a report of exploitation.
- How severe?
- 9.8 Critical
CVSS v3.1 base score, given by the CNA
- What should I do?
CISA has set no required action, because the vulnerability is not in KEV.
The CVE record links no vendor advisory, patch or mitigation.
- Which versions are affected?
Affected
- 2.6.33
Unaffected before 2.6.33; 5.10.273; 5.15.224; 6.1.191; 6.6.161; 6.12.115; and 3 more
Source: CISA KEV 2026.10.30, as of ; FIRST EPSS, as of ; CVE List, as of . About the data.
Description
scsi: libiscsi: Reject a negative task index from parse_pdu_itt
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.
Source: CVE List, as of . About the data.
What to do
Advisories and patches
The CVE record links no vendor advisory, patch or mitigation.
This summary is based on the CVE record as of . Check the vendor's advisory before you act: affected versions and fixes can change.
Affected products and versions
Versions by product, as listed in the CVE record (2 products)
| Status | Versions |
|---|---|
| Affected | from bfead3b2cb46 to before 24bd9ba431b2 |
| Affected | from bfead3b2cb46 to before f8fabe1fe044 |
| Affected | from bfead3b2cb46 to before e896a97f336c |
| Affected | from bfead3b2cb46 to before 6200fb2de579 |
| Affected | from bfead3b2cb46 to before 0eb06ebbbecb |
| Affected | from bfead3b2cb46 to before 6cadfa6f1f58 |
| Affected | from bfead3b2cb46 to before 35b60549a956 |
| Affected | from bfead3b2cb46 to before 8ee2a09a1dbb |
Versions not listed are: unaffected.
| Status | Versions |
|---|---|
| Affected | 2.6.33 |
| Unaffected | before 2.6.33 |
| Unaffected | 5.10.273 |
| Unaffected | 5.15.224 |
| Unaffected | 6.1.191 |
| Unaffected | 6.6.161 |
| Unaffected | 6.12.115 |
| Unaffected | 6.18.59 |
| Unaffected | 7.2.13 |
| Unaffected | 7.3 |
Versions not listed are: affected.
Versions the record lists as unaffected: 5.10.273, 5.15.224, 6.1.191, 6.6.161, 6.12.115, 6.18.59, 7.2.13, 7.3.
Source: CVE List, as of . About the data.
Timeline
| Date | Event |
|---|---|
| CVE record published | |
| CVE record last updated |
References
8
Known exploited Linux vulnerabilities
- CVE-2026-46300: Linux Kernel Missing Initialization of a Variable Vulnerability
- CVE-2025-39682: Linux Kernel Improper Check for Unusual or Exceptional Conditions Vulnerability
- CVE-2025-39964: Linux Kernel Race Condition Vulnerability
- CVE-2026-53266: Linux Kernel Out-of-Bounds Write Vulnerability
- CVE-2026-53362: Linux Kernel Unspecified Vulnerability