CVE-2026-64254

MEDIUMNVD 5.55.5—
EchelonGraph scoreMEDIUM confidence

Score 5.5 from GitHub Security Advisory published 2026-07-24. NVD baseline CVSS 5.5; sources differ by 0.0.

Triggered by: GitHub Security Advisory CVSS
Sources: epss, ghsa, nvd
Trending — 3 sources updated this week
5.5EG
EchelonGraph verdictMonitorLow exploitation likelihood right now — keep watching.
  • Lower severity and no public exploit yet
CISA-KEV: Not listedEPSS PROB: 0%CVSS: 5.5Exploit: None knownExposed: 0

No vendor fix yet — apply a workaround or compensating control (WAF / firewall / segmentation) and watch for a patch.

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 v3
5.5
EG Score
5.5(medium)
EG Risk
29(Track)
EG Risk 29/100SSVC: Track

EG Risk is EchelonGraph's 0–100 priority score: it fuses intrinsic severity with real-world exploitation and automatability so you can rank equal-severity CVEs and fix the most dangerous first. Higher = act sooner. Distinct from the 0–10 EG Score (severity).

How it’s computed
Severity55% × 45%
Exploitation0% × 40%
Automatability30% × 15%
Action: Routine — remediate on your standard cadence.
EPSS PROB
0%
EPSS %ILE
2%
KEV
Not listed

Published

July 24, 2026

Last Modified

August 17, 2026

Advisory Details (6)

Auto-updated Aug 12, 2026
No patch confirmed yet.
generic

NTB: epf: Avoid pci_iounmap() with offset when PEER_SPAD and CONFIG share BAR - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/eb47b9bffd07a47b84910847cb5ea066ce184055
generic

NTB: epf: Avoid pci_iounmap() with offset when PEER_SPAD and CONFIG share BAR - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/d876153680e3d721d385e554def919bce3d18c74
generic

NTB: epf: Avoid pci_iounmap() with offset when PEER_SPAD and CONFIG share BAR - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/a4be4a1308f02bff79a30eea2d04ead5b63685f2
generic

NTB: epf: Avoid pci_iounmap() with offset when PEER_SPAD and CONFIG share BAR - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/9764a786ba98db58f0725913c369e721253aba33
generic

NTB: epf: Avoid pci_iounmap() with offset when PEER_SPAD and CONFIG share BAR - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/81371dbd23601f67f01372817fdbab42c5601e43
generic

NTB: epf: Avoid pci_iounmap() with offset when PEER_SPAD and CONFIG share BAR - kernel/git/stable/linux.git - Linux kernel stable tree

https://git.kernel.org/stable/c/06f6dd2ff2bd07eaf7178a807407ff27e85122b4

Vendor Advisories for CVE-2026-64254(2)

These vendors published their own advisory mentioning this CVE — often with vendor-specific remediation steps + affected product lists not in NVD.

Affected Packages

(4 across 4 ecosystems)
Debian:11(1)
PackageVulnerable rangeFixed inDependents
linux-6.16.1.106-3~deb11u1 ... 6.1.176-1~deb11u1 (21 versions)6.1.177-1~deb11u1—
Debian:12(1)
PackageVulnerable rangeFixed inDependents
linux6.1.106-1 ... 6.1.99-1 (54 versions)6.1.177-1—
Debian:13(1)
PackageVulnerable rangeFixed inDependents
linux6.12.38-1 ... 6.12.95-1~bpo12+1 (29 versions)6.12.95-1—
Debian:14(1)
PackageVulnerable rangeFixed inDependents
linux6.12.100-1 ... 7.1~rc7-1~exp1 (153 versions)7.1.3-1—

Weakness Classification(1)

MITRE Common Weakness Enumeration — the root-cause categories this CVE belongs to.

Data Freshness Timeline

(refreshed 17× in last 7d / 63× in last 30d)

Each row is a source pipeline that fetched or updated this CVE on that date, with what changed. For example, "NVD update" means NVD published or revised its analysis for this CVE; "MITRE cvelistV5" means we ingested or refreshed it from the CNA feed. Most recent first.

  1. 2026-08-26 14:47 UTCEPSS rescore
  2. 2026-08-25 23:53 UTCGHSA enrichment
  3. 2026-08-25 00:31 UTCEG score recompute
  4. 2026-08-25 00:31 UTCGHSA enrichment
  5. 2026-08-24 01:10 UTCEG score recompute
  6. 2026-08-24 01:10 UTCGHSA enrichment
  7. 2026-08-23 01:48 UTCEG score recompute
  8. 2026-08-23 01:48 UTCGHSA enrichment
  9. 2026-08-23 00:19 UTCEPSS rescore
  10. 2026-08-22 02:26 UTCEG score recompute
  11. 2026-08-22 02:26 UTCGHSA enrichment
  12. 2026-08-21 23:49 UTCEPSS rescore
  13. 2026-08-21 02:55 UTCEG score recompute
  14. 2026-08-21 02:55 UTCGHSA enrichment
  15. 2026-08-20 22:55 UTCEPSS rescore
  16. 2026-08-20 03:31 UTCEG score recompute
  17. 2026-08-20 03:31 UTCGHSA enrichment
  18. 2026-08-19 17:04 UTCEPSS rescore
  19. 2026-08-19 04:09 UTCEG score recompute
  20. 2026-08-19 04:09 UTCGHSA enrichment
  21. 2026-08-18 13:48 UTCEPSS rescore
  22. 2026-08-18 04:43 UTCEG score recompute
  23. 2026-08-18 04:43 UTCGHSA enrichment
  24. 2026-08-17 13:47 UTCEPSS rescore
  25. 2026-08-17 05:22 UTCEG score recompute
Show 48 more
  1. 2026-08-17 05:22 UTCGHSA enrichment
  2. 2026-08-16 14:56 UTCEPSS rescore
  3. 2026-08-16 13:25 UTCEG score recompute
  4. 2026-08-16 13:25 UTCGHSA enrichment
  5. 2026-08-15 14:03 UTCEG score recompute
  6. 2026-08-15 14:03 UTCGHSA enrichment
  7. 2026-08-15 01:30 UTCEPSS rescore
  8. 2026-08-14 14:41 UTCEG score recompute
  9. 2026-08-14 14:41 UTCGHSA enrichment
  10. 2026-08-13 22:00 UTCEPSS rescore
  11. 2026-08-13 15:19 UTCEG score recompute
  12. 2026-08-13 15:19 UTCGHSA enrichment
  13. 2026-08-12 15:55 UTCEG score recompute▲ 5.50
  14. 2026-08-12 15:55 UTCGHSA enrichment
  15. 2026-08-12 15:55 UTCNVD updateCVSS v3 → 5.5 · severity → MEDIUM
  16. 2026-08-12 13:51 UTCEPSS rescore
  17. 2026-08-11 00:00 UTCEPSS rescore
  18. 2026-08-10 11:47 UTCGHSA enrichment
  19. 2026-08-08 16:37 UTCEPSS rescore
  20. 2026-08-07 18:39 UTCGHSA enrichment
  21. 2026-08-06 13:47 UTCEPSS rescore
  22. 2026-08-05 19:17 UTCEPSS rescore
  23. 2026-08-05 19:17 UTCEPSS rescore
  24. 2026-08-05 01:32 UTCGHSA enrichment
  25. 2026-08-04 15:10 UTCEPSS rescore
  26. 2026-08-04 10:39 UTCEPSS rescore
  27. 2026-08-03 10:36 UTCEPSS rescore
  28. 2026-08-02 08:24 UTCGHSA enrichment
  29. 2026-08-02 02:27 UTCEPSS rescore
  30. 2026-08-01 04:16 UTCEPSS rescore
  31. 2026-07-30 16:28 UTCEPSS rescore
  32. 2026-07-30 15:16 UTCEG score recompute
  33. 2026-07-30 15:16 UTCGHSA enrichment
  34. 2026-07-30 01:30 UTCEPSS rescore
  35. 2026-07-30 01:30 UTCEPSS rescore
  36. 2026-07-28 20:06 UTCEG score recompute
  37. 2026-07-28 20:06 UTCGHSA enrichment
  38. 2026-07-28 15:37 UTCEPSS rescore
  39. 2026-07-27 14:14 UTCEPSS rescore
  40. 2026-07-26 14:54 UTCEPSS rescore
  41. 2026-07-26 14:54 UTCEPSS rescore
  42. 2026-07-26 02:57 UTCEG score recompute
  43. 2026-07-26 02:56 UTCGHSA enrichment
  44. 2026-07-25 14:18 UTCEPSS rescore
  45. 2026-07-25 14:18 UTCEPSS rescore
  46. 2026-07-24 16:31 UTCNVD update
  47. 2026-07-24 15:42 UTCEG score recompute
  48. 2026-07-24 15:41 UTCMITRE cvelistV5first tracked

Related CVEs(same CWE)

Frequently asked(5)

What is CVE-2026-64254?
CVE-2026-64254 is a medium vulnerability published on July 24, 2026. In the Linux kernel, the following vulnerability has been resolved: NTB: epf: Avoid pciiounmap() with offset when PEERSPAD and CONFIG share BAR When BARPEERSPAD 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…
When was CVE-2026-64254 disclosed?
CVE-2026-64254 was first published in the National Vulnerability Database on July 24, 2026, with the most recent update on August 17, 2026. EchelonGraph re-ingests CVE updates from NVD on a 2-hour cycle, so this page reflects the latest published state.
Is CVE-2026-64254 actively exploited?
CVE-2026-64254 is not currently on CISA's Known Exploited Vulnerabilities catalog. FIRST EPSS estimates a 0% probability of exploitation in the next 30 days, which ranks it in the top 98.4% of all scored CVEs.
What is the CVSS score of CVE-2026-64254?
CVE-2026-64254 has a CVSS v3 base score of 5.5 (NVD).
How do I remediate CVE-2026-64254?
Patch to the fixed version published by the affected vendor. Where vendor advisories exist for CVE-2026-64254, EchelonGraph cross-links them in the Vendor Advisories panel below — those typically contain the canonical remediation steps, fixed version numbers, and any vendor-specific mitigations.

Dependency Blast Radius

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