ata: ahci: fail probe if BAR too small for claimed ports
Key facts
- Attack vector
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- Privileges required
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- User interaction
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- Attack complexity
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- Impact type
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- Confidentiality · integrity · availability
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- Fix status
- Partial Red Hat: 7 without a fix
No CVSS vector from any source. Fix status from CNA and Red Hat.
Summary
In the Linux kernel, the following vulnerability has been resolved: ata: ahci: fail probe if BAR too small for claimed ports When an AHCI controller is disabled in BIOS, its HOST_CAP register may contain a bogus value, e.g. 0xFFFFFFFF. Since CAP.NP (Number of Ports) is a zeroes based 5-bit register field, a value of 0x1f means 32 ports. If CAP.NP claims more ports than can physically fit within the mapped BAR region, accessing port registers beyond the BAR boundary causes a kernel panic. Add validation in ahci_init_one() to check that the BAR size is sufficient for the number of ports claimed in CAP.NP. The check calculates the required MMIO size as: required_size = 0x100 (global registers) + max_ports * 0x80 If required_size exceeds the actual BAR size, the probe fails with -ENODEV, preventing the panic and providing a clear error message. [cassel: commit log]
Why it matters now
SSVC decision points
Not available: CISA has not published SSVC decision points for this record.
Affected products
Remediation
- Fix · CNA Linux (Linux) Fixed in 5.10.271, 5.15.222, 6.1.189, 6.6.158, 6.12.111, 6.18.53, 7.2
Vendor assessments
Red Hat
Red Hat rating: Low. Red Hat's page for this CVE →
| Product | Status | Plan or fix |
|---|---|---|
| Red Hat Enterprise Linux 10 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 6 | Affected | No fix planned: Out of support scope |
| Red Hat Enterprise Linux 7 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 8 | Affected | No fix yet: Fix deferred |
| Red Hat Enterprise Linux 9 | Affected | No fix yet: Fix deferred |
| Red Hat OpenShift Container Platform 4 | Affected | No fix yet: Fix deferred |
| Red Hat OpenShift Container Platform 5 | Affected | No fix yet: Fix deferred |
Timeline
- 2026-10-02 Threatist record created from CVE-2026-97441
- 2026-10-03 Alias added: GHSA-gq9q-jj7r-2h85
- 2026-10-03 Fix available: Linux/[email protected], Linux/[email protected], Linux/Linux@533a08ea11217100cec7a0ed903cb9b9c892d6f1 +5 · CNA
- 2026-10-03 4 new references · CNA
- 2026-11-07 Affected versions changed · Red Hat
References
Other 7
- https://git.kernel.org/stable/c/533a08ea11217100cec7a0ed903cb9b9c892d6f1
- https://git.kernel.org/stable/c/c717b20100ef8cd06b5237af70ea2cb692e058ce
- https://git.kernel.org/stable/c/ff0ab535f8febbd32afa5832f8d2d9b06a8d5060
- https://git.kernel.org/stable/c/6d29b91164424256a759ddabc8f2de1ae09bd3f1
- https://git.kernel.org/stable/c/df262c828b616450eb351349e91c63447551bd01
- https://git.kernel.org/stable/c/f2e291043c37a896d7f9797e25a356dceb030177
- https://git.kernel.org/stable/c/c4086c6e1af757e1ff26fa2d2926b3ec0195de79
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Sources
- CVE-2026-97441 · CVE Program
- CVE-2026-97441 · NVD
- FIRST EPSS
- GHSA-gq9q-jj7r-2h85 · GitHub Advisory Database · CC BY 4.0
- CVE-2026-97441 · Red Hat security data · CC BY 4.0
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