CVE-2026-64254

Summary

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 Software

VendorProductVersion RangeStatus
LinuxLinuxe75d5ae8ab88b7ffb3d1d56124b003f3555f74b4 < eb47b9bffd07a47b84910847cb5ea066ce184055affected
LinuxLinuxe75d5ae8ab88b7ffb3d1d56124b003f3555f74b4 < 06f6dd2ff2bd07eaf7178a807407ff27e85122b4affected
LinuxLinuxe75d5ae8ab88b7ffb3d1d56124b003f3555f74b4 < a4be4a1308f02bff79a30eea2d04ead5b63685f2affected
LinuxLinuxe75d5ae8ab88b7ffb3d1d56124b003f3555f74b4 < 81371dbd23601f67f01372817fdbab42c5601e43affected
LinuxLinuxe75d5ae8ab88b7ffb3d1d56124b003f3555f74b4 < 9764a786ba98db58f0725913c369e721253aba33affected
LinuxLinuxe75d5ae8ab88b7ffb3d1d56124b003f3555f74b4 < d876153680e3d721d385e554def919bce3d18c74affected
LinuxLinux6.0affected
LinuxLinux0 < 6.0unaffected
LinuxLinux6.1.177 <= 6.1.*unaffected
LinuxLinux6.6.144 <= 6.6.*unaffected
LinuxLinux6.12.95 <= 6.12.*unaffected
LinuxLinux6.18.38 <= 6.18.*unaffected
LinuxLinux7.1.3 <= 7.1.*unaffected
LinuxLinux7.2-rc1 <= *unaffected

Weaknesses

References