CVE-2026-64254

NTB: epf: Avoid pci_iounmap() with offset when PEER_SPAD and CONFIG share BAR

MEDIUM

5.5

CVSS Score

Published: July 24, 2026 at 03:31 PM UTC

Updated: August 17, 2026 at 05:17 AM UTC

1 product affected across 1 vendorLinux Kernel

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Severity

MEDIUM5.5

Exploit prediction

EPSS 0.1%

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Linux Kernel · Linux

95%

6.0 ≤ v < 6.1.1776.0 ≤ v < 6.12.956.0 ≤ v < 6.18.386.0 ≤ v < 6.6.1446.0 ≤ v < 7.1.36.0 ≤ v < 7.26.13 ≤ v < 6.18.386.19 ≤ v < 7.1.36.2 ≤ v < 6.6.1446.7 ≤ v < 6.12.956.0e75d5ae8ab88b7ffb3d1d56124b003f3555f74b4

Vendor states this is fixed in 06f6dd2ff2bd07eaf7178a807407ff27e85122b4 (fixed)

Vendor states this is fixed in 81371dbd23601f67f01372817fdbab42c5601e43 (fixed)

Vendor states this is fixed in 9764a786ba98db58f0725913c369e721253aba33 (fixed)

Vendor states this is fixed in a4be4a1308f02bff79a30eea2d04ead5b63685f2 (fixed)

Vendor states this is fixed in d876153680e3d721d385e554def919bce3d18c74 (fixed)

Vendor states this is fixed in eb47b9bffd07a47b84910847cb5ea066ce184055 (fixed)

Vendor states this is fixed in 6.0 (unaffected)

Vendor states this is fixed in 6.1.177 (unaffected)

Vendor states this is fixed in 6.12.95 (unaffected)

Vendor states this is fixed in 6.18.38 (unaffected)

Vendor states this is fixed in 6.6.144 (unaffected)

Vendor states this is fixed in 7.1.3 (unaffected)