# CVE-2026-64254: linux: In the Linux kernel, the following vulnerability has been resolved:  NTB: epf: Avoid pci_iounmap() with offset when P...

CVE-2026-64254 is fixed in linux on 1 platform, first by DEBIAN-CVE-2026-64254, released July 25, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-64254
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0011
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Jul 24, 2026

## Description

In the Linux kernel, the following vulnerability has been resolved:  NTB: epf: Avoid pci_iounmap() with offset when PEER_SPAD and CONFIG share BAR  When BAR_PEER_SPAD and BAR_CONFIG share one PCI BAR, the module teardown path ends up calling pci_iounmap() on the same iomem with some offset, which is unnecessary and triggers a kernel warning like the following:    Trying to vunmap() nonexistent vm area (0000000069a5ffe8)   WARNING: mm/vmalloc.c:3470 at vunmap+0x58/0x68, CPU#5: modprobe/2937   [...]   Call trace:    vunmap+0x58/0x68 (P)    iounmap+0x34/0x48    pci_iounmap+0x2c/0x40    ntb_epf_pci_remove+0x44/0x80 [ntb_hw_epf]    pci_device_remove+0x48/0xf8    device_remove+0x50/0x88    device_release_driver_internal+0x1c8/0x228    driver_detach+0x50/0xb0    bus_remove_driver+0x74/0x100    driver_unregister+0x34/0x68    pci_unregister_driver+0x34/0xa0    ntb_epf_pci_driver_exit+0x14/0xfe0 [ntb_hw_epf]   [...]  Fix it by unmapping only when PEER_SPAD and CONFIG use difference bars.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 6.1.177-1 | [DEBIAN-CVE-2026-64254](https://patchblox.com/security/data/fix/linux/debian-cve-2026-64254.md) | Jul 25, 2026 |
| Linux | linux Debian 13.5 (trixie) | 6.12.95-1 | [DEBIAN-CVE-2026-64254](https://patchblox.com/security/data/fix/linux/debian-cve-2026-64254.md) | Jul 25, 2026 |
| Linux | linux Debian 14 | 7.1.3-1 | [DEBIAN-CVE-2026-64254](https://patchblox.com/security/data/fix/linux/debian-cve-2026-64254.md) | Jul 25, 2026 |

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Data as of 2026-11-08T13:06:02Z 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 Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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