CVE-2026-80790
Received Received - Intake

Invalid Free in Linux Kernel NVMe-oF/FC Target

Publication date: 2026-09-04

Last updated on: 2026-09-04

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: nvmet-fc: fix invalid free in LS IOD error path nvmet_fc_alloc_ls_iodlist() advances iod while initializing the LS IOD array. If an rqstbuf allocation or response buffer DMA mapping fails, the unwind loop decrements iod past the start of the array. The final kfree(iod) therefore frees an address before the allocated object. This can be reproduced with nvme-fcloop and failslab by setting fail-nth to 6 before creating a target port. KASAN reports: BUG: KASAN: invalid-free in nvmet_fc_register_targetport Free of addr ffff88816cf8ff48 by task nvmet_fail_nth/9552 Free the original allocation base stored in tgtport->iod instead. With this fix applied, the same sysfs write with fail-nth=6 returns -ENOMEM without any KASAN report.

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Meta Information

Published
2026-09-04
Last Modified
2026-09-04
Generated
2026-09-04
AI Q&A
2026-09-04
EPSS Evaluated
N/A
NVD
CVE-2026-80790
EUVD
EUVD-2026-71433

Affected Vendors & Products

Showing 2 associated CPEs
Vendor Product Version / Range
linux_kernel nvmet_fc *
linux linux_kernel *

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Exploitability

CWE
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KEV
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CWE ID Description
CWE-UNKNOWN

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Executive Summary

This is a Linux kernel vulnerability in the NVMe over Fabrics Target (nvmet-fc) subsystem. It involves an invalid memory free in the error handling path of LS IOD operations. When allocating or mapping fails, the cleanup code incorrectly frees memory before the original allocation, causing a use-after-free bug.

Detection Guidance

This vulnerability is specific to the Linux kernel's nvmet-fc subsystem and may not have direct detection commands. Monitoring for kernel crashes or KASAN reports related to nvmet_fc_register_targetport could indicate exploitation. Check kernel logs for invalid free errors or unexpected terminations.

Impact Analysis

This could lead to system crashes, kernel memory corruption, or privilege escalation if exploited. Systems using NVMe over Fabrics Target with Fibre Channel (nvmet-fc) may experience instability or security breaches due to memory corruption.

Compliance Impact

This vulnerability does not directly affect compliance with standards like GDPR or HIPAA as it is a memory management issue in the Linux kernel's nvmet-fc subsystem. It may indirectly impact compliance if exploited to cause system instability or data corruption, but no evidence suggests direct regulatory implications.

Mitigation Strategies

Apply the latest Linux kernel patches that include the fix for this issue. If immediate patching is not possible, disable the nvmet-fc subsystem if not in use. Monitor vendor advisories for updates and test patches in a non-production environment before deployment.

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