# CVE-2026-31594: PCI: endpoint: pci-epf-vntb: Remove duplicate resource teardown

CVE-2026-31594 is fixed in linux on 1 platform, first by DEBIAN-CVE-2026-31594, released May 15, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-31594
- Priority: Routine
- CVSS: 5.5 (Moderate)
- EPSS: 0.0012
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Apr 24, 2026
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-31594

## Description

In the Linux kernel, the following vulnerability has been resolved:  PCI: endpoint: pci-epf-vntb: Remove duplicate resource teardown  epf_ntb_epc_destroy() duplicates the teardown that the caller is supposed to perform later. This leads to an oops when .allow_link fails or when .drop_link is performed. The following is an example oops of the former case:    Unable to handle kernel paging request at virtual address dead000000000108   [...]   [dead000000000108] address between user and kernel address ranges   Internal error: Oops: 0000000096000044 [#1]  SMP   [...]   Call trace:    pci_epc_remove_epf+0x78/0xe0 (P)    pci_primary_epc_epf_link+0x88/0xa8    configfs_symlink+0x1f4/0x5a0    vfs_symlink+0x134/0x1d8    do_symlinkat+0x88/0x138    __arm64_sys_symlinkat+0x74/0xe0   [...]  Remove the helper, and drop pci_epc_put(). EPC device refcounting is tied to the configfs EPC group lifetime, and pci_epc_put() in the .drop_link path is sufficient.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 6.1.176-1 | [DEBIAN-CVE-2026-31594](https://patchblox.com/security/data/fix/linux/debian-cve-2026-31594.md) | May 15, 2026 |
| Linux | linux Debian 13.5 (trixie) | 6.12.85-1 | [DEBIAN-CVE-2026-31594](https://patchblox.com/security/data/fix/linux/debian-cve-2026-31594.md) | May 15, 2026 |
| Linux | linux Debian 14 | 6.19.14-1 | [DEBIAN-CVE-2026-31594](https://patchblox.com/security/data/fix/linux/debian-cve-2026-31594.md) | May 15, 2026 |

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Data as of 2026-11-09T07:25:28Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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