CVE-2026-64254 (GCVE-0-2026-64254)

Vulnerability from cvelistv5 – Published: 2026-07-24 15:31 – Updated: 2026-07-24 15:31
VLAI
Title
NTB: epf: Avoid pci_iounmap() with offset when PEER_SPAD and CONFIG share BAR
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.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: e75d5ae8ab88b7ffb3d1d56124b003f3555f74b4 , < eb47b9bffd07a47b84910847cb5ea066ce184055 (git)
Affected: e75d5ae8ab88b7ffb3d1d56124b003f3555f74b4 , < 06f6dd2ff2bd07eaf7178a807407ff27e85122b4 (git)
Affected: e75d5ae8ab88b7ffb3d1d56124b003f3555f74b4 , < a4be4a1308f02bff79a30eea2d04ead5b63685f2 (git)
Affected: e75d5ae8ab88b7ffb3d1d56124b003f3555f74b4 , < 81371dbd23601f67f01372817fdbab42c5601e43 (git)
Affected: e75d5ae8ab88b7ffb3d1d56124b003f3555f74b4 , < 9764a786ba98db58f0725913c369e721253aba33 (git)
Affected: e75d5ae8ab88b7ffb3d1d56124b003f3555f74b4 , < d876153680e3d721d385e554def919bce3d18c74 (git)
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Linux Linux Affected: 6.0
Unaffected: 0 , < 6.0 (semver)
Unaffected: 6.1.177 , ≤ 6.1.* (semver)
Unaffected: 6.6.144 , ≤ 6.6.* (semver)
Unaffected: 6.12.95 , ≤ 6.12.* (semver)
Unaffected: 6.18.38 , ≤ 6.18.* (semver)
Unaffected: 7.1.3 , ≤ 7.1.* (semver)
Unaffected: 7.2-rc1 , ≤ * (original_commit_for_fix)
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{
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              "versionType": "semver"
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              "versionType": "semver"
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nNTB: epf: Avoid pci_iounmap() with offset when PEER_SPAD and CONFIG share BAR\n\nWhen BAR_PEER_SPAD and BAR_CONFIG share one PCI BAR, the module teardown\npath ends up calling pci_iounmap() on the same iomem with some offset,\nwhich is unnecessary and triggers a kernel warning like the following:\n\n  Trying to vunmap() nonexistent vm area (0000000069a5ffe8)\n  WARNING: mm/vmalloc.c:3470 at vunmap+0x58/0x68, CPU#5: modprobe/2937\n  [...]\n  Call trace:\n   vunmap+0x58/0x68 (P)\n   iounmap+0x34/0x48\n   pci_iounmap+0x2c/0x40\n   ntb_epf_pci_remove+0x44/0x80 [ntb_hw_epf]\n   pci_device_remove+0x48/0xf8\n   device_remove+0x50/0x88\n   device_release_driver_internal+0x1c8/0x228\n   driver_detach+0x50/0xb0\n   bus_remove_driver+0x74/0x100\n   driver_unregister+0x34/0x68\n   pci_unregister_driver+0x34/0xa0\n   ntb_epf_pci_driver_exit+0x14/0xfe0 [ntb_hw_epf]\n  [...]\n\nFix it by unmapping only when PEER_SPAD and CONFIG use difference bars."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-24T15:31:22.293Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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          "url": "https://git.kernel.org/stable/c/06f6dd2ff2bd07eaf7178a807407ff27e85122b4"
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        },
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        }
      ],
      "title": "NTB: epf: Avoid pci_iounmap() with offset when PEER_SPAD and CONFIG share BAR",
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    "cveId": "CVE-2026-64254",
    "datePublished": "2026-07-24T15:31:22.293Z",
    "dateReserved": "2026-07-19T15:36:31.773Z",
    "dateUpdated": "2026-07-24T15:31:22.293Z",
    "state": "PUBLISHED"
  },
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  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-64254",
      "date": "2026-07-31",
      "epss": "0.00161",
      "percentile": "0.05699"
    },
    "microsoft_vex": {
      "current_release_date": "2026-07-27T14:45:32.000Z",
      "cve": "CVE-2026-64254",
      "id": "msrc_CVE-2026-64254",
      "initial_release_date": "2026-07-26T01:03:17.000Z",
      "product_status:known_affected": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "NTB: epf: Avoid pci_iounmap() with offset when PEER_SPAD and CONFIG share BAR",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-64254.json",
      "version": "2"
    },
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    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-07-28T09:05:45+00:00",
      "cve": "CVE-2026-64254",
      "id": "CVE-2026-64254",
      "initial_release_date": "2026-07-24T00:00:00+00:00",
      "product_status:known_affected": "3",
      "product_status:known_not_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: NTB: epf: Avoid pci_iounmap() with offset when PEER_SPAD and CONFIG share BAR",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-64254.json",
      "version": "3"
    }
  }
}



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  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
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