CVE-2026-64254

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

State: Published
Severity: Not scored
Published: Jul 24, 2026
Updated: Aug 17, 2026
Reserved: Jul 19, 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.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	e75d5ae8ab88b7ffb3d1d56124b003f3555f74b4 to before eb47b9bffd07a47b84910847cb5ea066ce184055Affected e75d5ae8ab88b7ffb3d1d56124b003f3555f74b4 to before 06f6dd2ff2bd07eaf7178a807407ff27e85122b4Affected e75d5ae8ab88b7ffb3d1d56124b003f3555f74b4 to before a4be4a1308f02bff79a30eea2d04ead5b63685f2Affected e75d5ae8ab88b7ffb3d1d56124b003f3555f74b4 to before 81371dbd23601f67f01372817fdbab42c5601e43Affected e75d5ae8ab88b7ffb3d1d56124b003f3555f74b4 to before 9764a786ba98db58f0725913c369e721253aba33Affected e75d5ae8ab88b7ffb3d1d56124b003f3555f74b4 to before d876153680e3d721d385e554def919bce3d18c74Affected
LinuxLinux	6.0Affected before 6.0Not affected 6.1.177 through 6.1.Not affected 6.6.144 through 6.6.Not affected 6.12.95 through 6.12.Not affected 6.18.38 through 6.18.Not affected 7.1.3 through 7.1.*Not affected 7.2 and laterNot affected

Product

Versions

LinuxLinux

e75d5ae8ab88b7ffb3d1d56124b003f3555f74b4 to before eb47b9bffd07a47b84910847cb5ea066ce184055Affected
e75d5ae8ab88b7ffb3d1d56124b003f3555f74b4 to before 06f6dd2ff2bd07eaf7178a807407ff27e85122b4Affected
e75d5ae8ab88b7ffb3d1d56124b003f3555f74b4 to before a4be4a1308f02bff79a30eea2d04ead5b63685f2Affected
e75d5ae8ab88b7ffb3d1d56124b003f3555f74b4 to before 81371dbd23601f67f01372817fdbab42c5601e43Affected
e75d5ae8ab88b7ffb3d1d56124b003f3555f74b4 to before 9764a786ba98db58f0725913c369e721253aba33Affected
e75d5ae8ab88b7ffb3d1d56124b003f3555f74b4 to before d876153680e3d721d385e554def919bce3d18c74Affected

LinuxLinux

6.0Affected
before 6.0Not affected
6.1.177 through 6.1.*Not affected
6.6.144 through 6.6.*Not affected
6.12.95 through 6.12.*Not affected
6.18.38 through 6.18.*Not affected
7.1.3 through 7.1.*Not affected
7.2 and laterNot affected

References

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