9.8 Critical

In the Linux kernel, the following vulnerability has been resolved: scsi: libiscsi: Reject a negative task index from parsepduitt A…

CVE-2026-99154

In the Linux kernel, the following vulnerability has been resolved: scsi: libiscsi: Reject a negative task index from parsepduitt A transport that implements parsepduitt hands libiscsi an index taken from the PDU, and both lookups bound it from above only: if (i >= session->cmdsmax) i and cmdsmax are both int, so a negative index passes and session->cmds[i] is read from before the array. be2iscsi produces one. beiscsiparsepdu() assigns the raw tag, index = (int)itt; and beiscsicompletepdu() 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 iscsiverifyitt() with nothing to reject. Bound the index from below in both lookups.

Assessment

CVSS: 9.8 (v3.1)
Severity: Critical
EPSS: 0.17% chance of exploitation in the next 30 days
Known exploited: Not listed in CISA KEV
Exploit availability: Nothing found in Exploit-DB, Metasploit, Nuclei or public PoC repositories
Published: 28 October 2026
Last updated: 31 October 2026
Affected: Linux
Assigner: Linux

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

At the source

EUVD (ENISA)

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