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5.5
MEDIUM CVSS 3.1
CVE-2026-64254
NTB: epf: Avoid pci_iounmap() with offset when PEER_SPAD and CONFIG share BAR
Overview
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.

Details
INFO

Published Date :

July 24, 2026, 4:16 p.m.

Last Modified :

Aug. 17, 2026, 5:17 a.m.

Remotely Exploit :

No

Source :

416baaa9-dc9f-4396-8d5f-8c081fb06d67
Impact
Affected Products

The following products are affected by CVE-2026-64254 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Linux linux_kernel
: Total Affected Vendor : 1 | Products : 1
Scoring
CVSS Scores
The Common Vulnerability Scoring System is a standardized framework for assessing the severity of vulnerabilities in software and systems. We collect and displays CVSS scores from various sources for each CVE.
Score Version Severity Vector Exploitability Score Impact Score Source
CVSS 3.1 MEDIUM [email protected]
Solution
Update the Linux kernel to prevent double unmapping of PCI BARs.
  • Update the Linux kernel to the latest version.
  • Apply the specific patch for NTB: EPF module.
  • Ensure PEER_SPAD and CONFIG use different BARs if possible.
  • Test the module teardown path after update.
References
References to Advisories, Solutions, and Tools

Here, you will find a curated list of external links that provide in-depth information, practical solutions, and valuable tools related to CVE-2026-64254.

URL Resource
https://git.kernel.org/stable/c/06f6dd2ff2bd07eaf7178a807407ff27e85122b4 Patch
https://git.kernel.org/stable/c/81371dbd23601f67f01372817fdbab42c5601e43 Patch
https://git.kernel.org/stable/c/9764a786ba98db58f0725913c369e721253aba33 Patch
https://git.kernel.org/stable/c/a4be4a1308f02bff79a30eea2d04ead5b63685f2 Patch
https://git.kernel.org/stable/c/d876153680e3d721d385e554def919bce3d18c74 Patch
https://git.kernel.org/stable/c/eb47b9bffd07a47b84910847cb5ea066ce184055 Patch
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-64254 is associated with the following CWEs:

Common Attack Pattern Enumeration and Classification (CAPEC)

Common Attack Pattern Enumeration and Classification (CAPEC) stores attack patterns, which are descriptions of the common attributes and approaches employed by adversaries to exploit the CVE-2026-64254 weaknesses.

We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2026-64254 vulnerability anywhere in the article.

Results are limited to the first 20 news articles due to potential performance issues.

The following table lists the changes that have been made to the CVE-2026-64254 vulnerability over time.

Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.

  • CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    Aug. 17, 2026

    Action Type Old Value New Value
    Changed Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': 'e75d5ae8ab88b7ffb3d1d56124b003f3555f74b4', 'lessThan': 'eb47b9bffd07a47b84910847cb5ea066ce184055', 'versionType': 'git'}, {'status': 'affected', 'version': 'e75d5ae8ab88b7ffb3d1d56124b003f3555f74b4', 'lessThan': '06f6dd2ff2bd07eaf7178a807407ff27e85122b4', 'versionType': 'git'}, {'status': 'affected', 'version': 'e75d5ae8ab88b7ffb3d1d56124b003f3555f74b4', 'lessThan': 'a4be4a1308f02bff79a30eea2d04ead5b63685f2', 'versionType': 'git'}, {'status': 'affected', 'version': 'e75d5ae8ab88b7ffb3d1d56124b003f3555f74b4', 'lessThan': '81371dbd23601f67f01372817fdbab42c5601e43', 'versionType': 'git'}, {'status': 'affected', 'version': 'e75d5ae8ab88b7ffb3d1d56124b003f3555f74b4', 'lessThan': '9764a786ba98db58f0725913c369e721253aba33', 'versionType': 'git'}, {'status': 'affected', 'version': 'e75d5ae8ab88b7ffb3d1d56124b003f3555f74b4', 'lessThan': 'd876153680e3d721d385e554def919bce3d18c74', 'versionType': 'git'}], 'programFiles': ['drivers/ntb/hw/epf/ntb_hw_epf.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '6.0'}, {'status': 'unaffected', 'version': '0', 'lessThan': '6.0', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.1.177', 'versionType': 'semver', 'lessThanOrEqual': '6.1.*'}, {'status': 'unaffected', 'version': '6.6.144', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.95', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.38', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.3', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc1', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['drivers/ntb/hw/epf/ntb_hw_epf.c'], 'defaultStatus': 'affected'}] [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': 'e75d5ae8ab88b7ffb3d1d56124b003f3555f74b4', 'lessThan': 'eb47b9bffd07a47b84910847cb5ea066ce184055', 'versionType': 'git'}, {'status': 'affected', 'version': 'e75d5ae8ab88b7ffb3d1d56124b003f3555f74b4', 'lessThan': '06f6dd2ff2bd07eaf7178a807407ff27e85122b4', 'versionType': 'git'}, {'status': 'affected', 'version': 'e75d5ae8ab88b7ffb3d1d56124b003f3555f74b4', 'lessThan': 'a4be4a1308f02bff79a30eea2d04ead5b63685f2', 'versionType': 'git'}, {'status': 'affected', 'version': 'e75d5ae8ab88b7ffb3d1d56124b003f3555f74b4', 'lessThan': '81371dbd23601f67f01372817fdbab42c5601e43', 'versionType': 'git'}, {'status': 'affected', 'version': 'e75d5ae8ab88b7ffb3d1d56124b003f3555f74b4', 'lessThan': '9764a786ba98db58f0725913c369e721253aba33', 'versionType': 'git'}, {'status': 'affected', 'version': 'e75d5ae8ab88b7ffb3d1d56124b003f3555f74b4', 'lessThan': 'd876153680e3d721d385e554def919bce3d18c74', 'versionType': 'git'}], 'programFiles': ['drivers/ntb/hw/epf/ntb_hw_epf.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '6.0'}, {'status': 'unaffected', 'version': '0', 'lessThan': '6.0', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.1.177', 'versionType': 'semver', 'lessThanOrEqual': '6.1.*'}, {'status': 'unaffected', 'version': '6.6.144', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.95', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.38', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.3', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['drivers/ntb/hw/epf/ntb_hw_epf.c'], 'defaultStatus': 'affected'}]
  • Initial Analysis by [email protected]

    Aug. 12, 2026

    Action Type Old Value New Value
    Added CVSS V3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
    Added CWE CWE-617
    Added CPE Configuration OR *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.2 up to (excluding) 6.6.144 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.7 up to (excluding) 6.12.95 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.13 up to (excluding) 6.18.38 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.19 up to (excluding) 7.1.3 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.0 up to (excluding) 6.1.177
    Added Reference Type kernel.org: https://git.kernel.org/stable/c/06f6dd2ff2bd07eaf7178a807407ff27e85122b4 Types: Patch
    Added Reference Type kernel.org: https://git.kernel.org/stable/c/81371dbd23601f67f01372817fdbab42c5601e43 Types: Patch
    Added Reference Type kernel.org: https://git.kernel.org/stable/c/9764a786ba98db58f0725913c369e721253aba33 Types: Patch
    Added Reference Type kernel.org: https://git.kernel.org/stable/c/a4be4a1308f02bff79a30eea2d04ead5b63685f2 Types: Patch
    Added Reference Type kernel.org: https://git.kernel.org/stable/c/d876153680e3d721d385e554def919bce3d18c74 Types: Patch
    Added Reference Type kernel.org: https://git.kernel.org/stable/c/eb47b9bffd07a47b84910847cb5ea066ce184055 Types: Patch
  • New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    Jul. 24, 2026

    Action Type Old Value New Value
    Added Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': 'e75d5ae8ab88b7ffb3d1d56124b003f3555f74b4', 'lessThan': 'eb47b9bffd07a47b84910847cb5ea066ce184055', 'versionType': 'git'}, {'status': 'affected', 'version': 'e75d5ae8ab88b7ffb3d1d56124b003f3555f74b4', 'lessThan': '06f6dd2ff2bd07eaf7178a807407ff27e85122b4', 'versionType': 'git'}, {'status': 'affected', 'version': 'e75d5ae8ab88b7ffb3d1d56124b003f3555f74b4', 'lessThan': 'a4be4a1308f02bff79a30eea2d04ead5b63685f2', 'versionType': 'git'}, {'status': 'affected', 'version': 'e75d5ae8ab88b7ffb3d1d56124b003f3555f74b4', 'lessThan': '81371dbd23601f67f01372817fdbab42c5601e43', 'versionType': 'git'}, {'status': 'affected', 'version': 'e75d5ae8ab88b7ffb3d1d56124b003f3555f74b4', 'lessThan': '9764a786ba98db58f0725913c369e721253aba33', 'versionType': 'git'}, {'status': 'affected', 'version': 'e75d5ae8ab88b7ffb3d1d56124b003f3555f74b4', 'lessThan': 'd876153680e3d721d385e554def919bce3d18c74', 'versionType': 'git'}], 'programFiles': ['drivers/ntb/hw/epf/ntb_hw_epf.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '6.0'}, {'status': 'unaffected', 'version': '0', 'lessThan': '6.0', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.1.177', 'versionType': 'semver', 'lessThanOrEqual': '6.1.*'}, {'status': 'unaffected', 'version': '6.6.144', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.95', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.38', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.3', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc1', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['drivers/ntb/hw/epf/ntb_hw_epf.c'], 'defaultStatus': 'affected'}]
    Added 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.
    Added Reference https://git.kernel.org/stable/c/06f6dd2ff2bd07eaf7178a807407ff27e85122b4
    Added Reference https://git.kernel.org/stable/c/81371dbd23601f67f01372817fdbab42c5601e43
    Added Reference https://git.kernel.org/stable/c/9764a786ba98db58f0725913c369e721253aba33
    Added Reference https://git.kernel.org/stable/c/a4be4a1308f02bff79a30eea2d04ead5b63685f2
    Added Reference https://git.kernel.org/stable/c/d876153680e3d721d385e554def919bce3d18c74
    Added Reference https://git.kernel.org/stable/c/eb47b9bffd07a47b84910847cb5ea066ce184055
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CVSS
Vulnerability Scoring Details
Base CVSS Score: 5.5
Attack Vector
Attack Complexity
Privileges Required
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Scope
Confidentiality Impact
Integrity Impact
Availability Impact