{"id":82512,"date":"2026-07-24T19:01:22","date_gmt":"2026-07-24T15:31:22","guid":{"rendered":"https:\/\/afaghhosting.net\/blog\/cve-2026-64254-ntb-epf-avoid-pci_iounmap-with-offset-when-peer_spad-and-config-share-bar\/"},"modified":"2026-07-24T19:01:22","modified_gmt":"2026-07-24T15:31:22","slug":"cve-2026-64254-ntb-epf-avoid-pci_iounmap-with-offset-when-peer_spad-and-config-share-bar","status":"publish","type":"post","link":"https:\/\/afaghhosting.net\/blog\/cve-2026-64254-ntb-epf-avoid-pci_iounmap-with-offset-when-peer_spad-and-config-share-bar\/","title":{"rendered":"CVE-2026-64254 &#8211; NTB: epf: Avoid pci_iounmap() with offset when PEER_SPAD and CONFIG share BAR"},"content":{"rendered":"<p>CVE ID :CVE-2026-64254<\/p>\n<p>  Published : July 24, 2026, 3:31 p.m. | 19\u00a0minutes ago<\/p>\n<p>  Description :In the Linux kernel, the following vulnerability has been resolved:<\/p>\n<p>NTB: epf: Avoid pci_iounmap() with offset when PEER_SPAD and CONFIG share BAR<\/p>\n<p>When BAR_PEER_SPAD and BAR_CONFIG share one PCI BAR, the module teardown<br \/>\npath ends up calling pci_iounmap() on the same iomem with some offset,<br \/>\nwhich is unnecessary and triggers a kernel warning like the following:<\/p>\n<p>  Trying to vunmap() nonexistent vm area (0000000069a5ffe8)<br \/>\n  WARNING: mm\/vmalloc.c:3470 at vunmap+0x58\/0x68, CPU#5: modprobe\/2937<br \/>\n  [&#8230;]\n  Call trace:<br \/>\n   vunmap+0x58\/0x68 (P)<br \/>\n   iounmap+0x34\/0x48<br \/>\n   pci_iounmap+0x2c\/0x40<br \/>\n   ntb_epf_pci_remove+0x44\/0x80 [ntb_hw_epf]\n   pci_device_remove+0x48\/0xf8<br \/>\n   device_remove+0x50\/0x88<br \/>\n   device_release_driver_internal+0x1c8\/0x228<br \/>\n   driver_detach+0x50\/0xb0<br \/>\n   bus_remove_driver+0x74\/0x100<br \/>\n   driver_unregister+0x34\/0x68<br \/>\n   pci_unregister_driver+0x34\/0xa0<br \/>\n   ntb_epf_pci_driver_exit+0x14\/0xfe0 [ntb_hw_epf]\n  [&#8230;]\n<p>Fix it by unmapping only when PEER_SPAD and CONFIG use difference bars.<\/p>\n<p>  Severity: 0.0 | NA<\/p>\n<p>  Visit the link for more details, such as CVSS details, affected products, timeline, and more&#8230;\u00a0<\/p>\n","protected":false},"excerpt":{"rendered":"<p>CVE ID :CVE-2026-64254 Published : July 24, 2026, 3:31 p.m. | 19\u00a0minutes ago 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 &hellip;<\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"closed","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[26],"tags":[],"class_list":["post-82512","post","type-post","status-publish","format-standard","hentry","category-vulnerability"],"_links":{"self":[{"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/posts\/82512","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/comments?post=82512"}],"version-history":[{"count":0,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/posts\/82512\/revisions"}],"wp:attachment":[{"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/media?parent=82512"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/categories?post=82512"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/afaghhosting.net\/blog\/wp-json\/wp\/v2\/tags?post=82512"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}