CVE-2026-64254 (GCVE-0-2026-64254)
Vulnerability from cvelistv5 – Published: 2026-07-24 15:31 – Updated: 2026-08-17 04:52
VLAI
EPSS
VEX
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
5.5 (Medium)
Assigner
References
6 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| 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) |
guessed | |
| 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 , ≤ * (original_commit_for_fix) |
guessed |
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"integrityImpact": "NONE",
"privilegesRequired": "LOW",
"scope": "UNCHANGED",
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"current_release_date": "2026-10-30T08:10:49+00:00",
"cve": "CVE-2026-64254",
"id": "CVE-2026-64254",
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"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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