CVE-2026-99153: Linux kernel · scsi: libiscsi: Validate the ITT reflected in a Reject PDU
Affects Linux kernelSource GCVE Database
Not known to be exploited.
Data as of 30 Oct 2026, 03:59 UTC
Rated by Threat Radar · CVSS not yet scored by NVD
Thin evidence
One scorer or noneExploitation evidence
Disclosed: evidence found.
CVE published 28 Oct 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors
A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 29 Oct 2026.
What to do
Affected software
| Product | Affected | Fixed in |
|---|---|---|
Ubuntu 26.10linuxpkg:deb/ubuntu/linux?arch=source&distro=stonkingOther threats | Affected
| Fixed in– |
Ubuntu 26.10linux-awspkg:deb/ubuntu/linux-aws?arch=source&distro=stonkingOther threats | Affected
| Fixed in– |
Ubuntu 26.10linux-azurepkg:deb/ubuntu/linux-azure?arch=source&distro=stonkingOther threats | Affected
| Fixed in– |
Ubuntu 26.10linux-azure-fdepkg:deb/ubuntu/linux-azure-fde?arch=source&distro=stonkingOther threats | Affected
| Fixed in– |
Ubuntu 26.10linux-gcppkg:deb/ubuntu/linux-gcp?arch=source&distro=stonkingOther threats | Affected
| Fixed in– |
Ubuntu 26.10linux-oraclepkg:deb/ubuntu/linux-oracle?arch=source&distro=stonkingOther threats | Affected
| Fixed in– |
Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.
AI-suggested
A fix for this vulnerability has been implemented in the Linux kernel by validating the ITT reflected in Reject PDUs to ensure it corresponds to an active in-flight task. Users should update to a kernel version that includes this fix. Since no vendor advisory or patch links are provided, verify the kernel version and apply official patches or updates from the Linux distribution maintainers to remediate this issue.
Description
A vulnerability in the Linux kernel's SCSI subsystem (libiscsi) allows improper validation of the Initiator Task Tag (ITT) reflected in a Reject Protocol Data Unit (PDU). This flaw can cause in-flight SCSI commands to be incorrectly completed as successful without actual data transfer, and may trigger kernel warnings or faults. The issue arises because the ITT extracted from the Reject PDU is not properly validated against active tasks, leading to potential task mismanagement and kernel instability.
References
- ubuntu.com/security/CVE-2026-99153 (opens in a new tab)
- cve.org/CVERecord?id=CVE-2026-99153 (opens in a new tab)
- git.kernel.org/stable/c/7215a69b6456fda79c0935c2959045dff3fcaac8 (opens in a new tab)
- git.kernel.org/stable/c/c5958c770b2a0ee492414e26b07da9164a0d1f5d (opens in a new tab)
- git.kernel.org/stable/c/d79343ae3223b3f7f74b55e79f8a1371fa3f4b1a (opens in a new tab)