Medium 5.5Published Jul 24, 2026

CVE-2026-64254NTB: epf: Avoid pci_iounmap() with offset when PEER_SPAD and CONFIG share BAR

Updated under an hour ago (Oct 27, 2026, 1:40 AM ET)

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Exploited in the last 30 days

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.

CVSS: 5.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Analyzed
Record last updated: Aug 17, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from e75d5ae8ab88b7ffb3d1d56124b003f3555f74b4 before eb47b9bffd07a47b84910847cb5ea066ce184055; from e75d5ae8ab88b7ffb3d1d56124b003f3555f74b4 before 06f6dd2ff2bd07eaf7178a807407ff27e85122b4; from e75d5ae8ab88b7ffb3d1d56124b003f3555f74b4 before a4be4a1308f02bff79a30eea2d04ead5b63685f2; from e75d5ae8ab88b7ffb3d1d56124b003f3555f74b4 before 81371dbd23601f67f01372817fdbab42c5601e43; from e75d5ae8ab88b7ffb3d1d56124b003f3555f74b4 before 9764a786ba98db58f0725913c369e721253aba33; from e75d5ae8ab88b7ffb3d1d56124b003f3555f74b4 before d876153680e3d721d385e554def919bce3d18c74	CNA record
linux linux_kernel linux:linux_kernel	from 6.0 before 6.1.177; from 6.2 before 6.6.144; from 6.7 before 6.12.95; from 6.13 before 6.18.38; from 6.19 before 7.1.3	NVD

References

References

https://git.kernel.org/stable/c/eb47b9bffd07a47b84910847cb5ea066ce184055	patch
https://git.kernel.org/stable/c/06f6dd2ff2bd07eaf7178a807407ff27e85122b4	patch
https://git.kernel.org/stable/c/a4be4a1308f02bff79a30eea2d04ead5b63685f2	patch
https://git.kernel.org/stable/c/81371dbd23601f67f01372817fdbab42c5601e43	patch
https://git.kernel.org/stable/c/9764a786ba98db58f0725913c369e721253aba33	patch
https://git.kernel.org/stable/c/d876153680e3d721d385e554def919bce3d18c74	patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.