# CVE-2026-80787: linux: In the Linux kernel, the following vulnerability has been resolved:  nvmet: pci-epf: fix use-after-free in nvmet_pci_...

CVE-2026-80787 is fixed in linux on 1 platform by DEBIAN-CVE-2026-80787 (version 7.1.12-1), released September 5, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-80787
- Priority: Routine
- CVSS: n/a
- EPSS: 0.0021
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Sep 4, 2026

## Description

In the Linux kernel, the following vulnerability has been resolved:  nvmet: pci-epf: fix use-after-free in nvmet_pci_epf_exec_iod_work()  nvmet_pci_epf_exec_iod_work() submits an I/O command with req->execute() and then waits for the command to complete and transfers the data back to the host. This wait is not needed for commands that do not transfer data from the device to the host. To decide whether that wait is needed, it reads iod->data_len and iod->dma_dir after calling req->execute().  However, once req->execute() is called, the command may complete asynchronously on another CPU. For commands that do not require a device-to-host data transfer, nvmet_pci_epf_queue_response() calls nvmet_pci_epf_complete_iod() directly, which can free the iod before it reads iod->data_len and iod->dma_dir, resulting in the KFENCE use-after- free:   BUG: KFENCE: use-after-free read in nvmet_pci_epf_exec_iod_work+0x288/0x798 [nvmet_pci_epf]   Use-after-free read at 0x00000000fdfa6d03 (in kfence-#63):   nvmet_pci_epf_exec_iod_work+0x288/0x798 [nvmet_pci_epf]   process_one_work+0x15c/0x4f0   worker_thread+0x18c/0x30c   kthread+0x130/0x140   ret_from_fork+0x10/0x20   kfence-#63: 0x00000000e3de0e71-0x00000000c938ad62, size=712, cache=kmalloc-1k   allocated by task 10 on cpu 0 at 73.995480s (0.005122s ago):   mempool_kmalloc+0x1c/0x28   mempool_alloc_noprof+0x40/0x9c   nvmet_pci_epf_poll_sqs_work+0xd4/0x344 [nvmet_pci_epf]   process_one_work+0x15c/0x4f0   worker_thread+0x18c/0x30c   kthread+0x130/0x140   ret_from_fork+0x10/0x20   freed by task 131 on cpu 3 at 73.995521s (0.008385s ago):   mempool_kfree+0x10/0x20   mempool_free+0x44/0x64   nvmet_pci_epf_free_iod+0x88/0x98 [nvmet_pci_epf]   nvmet_pci_epf_cq_work+0xfc/0x280 [nvmet_pci_epf]   process_one_work+0x15c/0x4f0   worker_thread+0x18c/0x30c   kthread+0x130/0x140   ret_from_fork+0x10/0x20  Fix this by referring to iod->data_len and iod->dma_dir before calling req->execute(). The remaining iod accesses such as iod->status are only reached on the device-to-host read path. In this case, nvmet_pci_epf_queue_response() signals iod->done instead of freeing the iod, so the iod stays valid.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 14 | 7.1.12-1 | [DEBIAN-CVE-2026-80787](https://patchblox.com/security/data/fix/linux/debian-cve-2026-80787.md) | Sep 5, 2026 |

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Data as of 2026-11-08T06:59:42Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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