CVE-2026-99154scsi: libiscsi: Reject a negative task index from parse_pdu_itt
- 9.8CriticalCVSS base score
- 0.51%Exploitation in 30 daysEPSS · top 56% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
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.
Timeline
ID reserved
By Linux
- 33 days later
· 33 days later
Published
- 3 days later
· 3 days later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | Critical9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| NVDNVD · Received | 3.1 | Critical9.8 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.51% · top 56% of all CVEs (12 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: Critical 9.8.
Affected products
- affected bfead3b2cb4607c71831423c3ee97d22cd0c9dcb – < 24bd9ba431b2daa263f3551bc2f09f6b4487f5ae
- affected bfead3b2cb4607c71831423c3ee97d22cd0c9dcb – < f8fabe1fe044f86abc42194b8f86dfd70212115f
- affected bfead3b2cb4607c71831423c3ee97d22cd0c9dcb – < e896a97f336c5edfc13066b57ed431cb3f64e68c
- affected bfead3b2cb4607c71831423c3ee97d22cd0c9dcb – < 6200fb2de579f268742a77b0f3d823cb0a8b1947
- affected bfead3b2cb4607c71831423c3ee97d22cd0c9dcb – < 0eb06ebbbecb122f0df9a1f7f623f5255be741ed
- affected bfead3b2cb4607c71831423c3ee97d22cd0c9dcb – < 6cadfa6f1f5896632d4223d3b7addb2a29fea74e
- affected bfead3b2cb4607c71831423c3ee97d22cd0c9dcb – < 35b60549a956237488c89a2d85352e026e7d55b7
- affected bfead3b2cb4607c71831423c3ee97d22cd0c9dcb – < 8ee2a09a1dbb257c9e828ad2497f8e4832dfb142
- affected 2.6.33
- unaffected < 2.6.33
- unaffected 5.10.273 – ≤ 5.10.*
- unaffected 5.15.224 – ≤ 5.15.*
- unaffected 6.1.191 – ≤ 6.1.*
- unaffected 6.6.161 – ≤ 6.6.*
- unaffected 6.12.115 – ≤ 6.12.*
- unaffected 6.18.59 – ≤ 6.18.*
- unaffected 7.2.13 – ≤ 7.2.*
- unaffected 7.3 – ≤ *
References
References8
- https://git.kernel.org/stable/c/24bd9ba431b2daa263f3551bc2f09f6b4487f5ae (opens in a new tab)
- https://git.kernel.org/stable/c/f8fabe1fe044f86abc42194b8f86dfd70212115f (opens in a new tab)
- https://git.kernel.org/stable/c/e896a97f336c5edfc13066b57ed431cb3f64e68c (opens in a new tab)
- https://git.kernel.org/stable/c/6200fb2de579f268742a77b0f3d823cb0a8b1947 (opens in a new tab)
- https://git.kernel.org/stable/c/0eb06ebbbecb122f0df9a1f7f623f5255be741ed (opens in a new tab)
- https://git.kernel.org/stable/c/6cadfa6f1f5896632d4223d3b7addb2a29fea74e (opens in a new tab)
- https://git.kernel.org/stable/c/35b60549a956237488c89a2d85352e026e7d55b7 (opens in a new tab)
- https://git.kernel.org/stable/c/8ee2a09a1dbb257c9e828ad2497f8e4832dfb142 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-111906 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
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[](https://cveledger.app/cve/CVE-2026-99154)Record last updated .