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CVE-2026-90383: misc: sgi-gru: remove interrupt-context page-table walks

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-17 · updated 2026-10-30

Description

In the Linux kernel, the following vulnerability has been resolved: misc: sgi-gru: remove interrupt-context page-table walks The GRU TLB miss handler walks a process's page tables without holding page-table locks or a reference to the mapped page. It also uses a kernel page-table accessor on user page tables and supports only PMD-level large mappings on x86-64. Remove the direct walker. Send interrupt faults directly to user polling mode so the existing call-OS fallback retries them in process context. Remove the mmap-lock failure statistic that can no longer be incremented.

Affected products

• Linux: 2.6.27 — fixed in 7.3

How to fix

Upgrade to a fixed version: Linux 7.3. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/0ca505b973aa1a5e3fcca7bd04774e794ff5e662
• https://git.kernel.org/stable/c/5a540ced720b4397306337cab34af1af4b30827c
• https://git.kernel.org/stable/c/6248eb1833ff0adfdbbadd5f846c2f22e02a01b0
• https://git.kernel.org/stable/c/877423f595b60f8fe7c18b64a5d283d9e1732a13
• https://git.kernel.org/stable/c/928a8e9f523df845fc496bcb9811013b67aabec5
• https://git.kernel.org/stable/c/ef81e4a1628ecfb9cfc442de10883f383faf17a1

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