Vulnerability 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.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 6.0, < 6.1.177 |
Related Weaknesses (CWE)
References
- https://git.kernel.org/stable/c/06f6dd2ff2bd07eaf7178a807407ff27e85122b4Patch
- https://git.kernel.org/stable/c/81371dbd23601f67f01372817fdbab42c5601e43Patch
- https://git.kernel.org/stable/c/9764a786ba98db58f0725913c369e721253aba33Patch
- https://git.kernel.org/stable/c/a4be4a1308f02bff79a30eea2d04ead5b63685f2Patch
- https://git.kernel.org/stable/c/d876153680e3d721d385e554def919bce3d18c74Patch
- https://git.kernel.org/stable/c/eb47b9bffd07a47b84910847cb5ea066ce184055Patch
FAQ
What is CVE-2026-64254?
CVE-2026-64254 is a vulnerability with a CVSS score of 5.5 (MEDIUM). 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,...
How severe is CVE-2026-64254?
CVE-2026-64254 has been rated MEDIUM with a CVSS base score of 5.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-64254?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel.