What’s Vulnerable › Vulnerabilities

CVE-2026-46284: mm/hugetlb: fix early boot crash on parameters without '=' separator

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-06-08 · updated 2026-07-23
• Weakness: CWE-476

Description

In the Linux kernel, the following vulnerability has been resolved: mm/hugetlb: fix early boot crash on parameters without '=' separator If hugepages, hugepagesz, or default_hugepagesz are specified on the kernel command line without the '=' separator, early parameter parsing passes NULL to hugetlb_add_param(), which dereferences it in strlen() and can crash the system during early boot. Reject NULL values in hugetlb_add_param() and return -EINVAL instead.

Affected products

• Linux kernel: from 6.15 before 6.18.27; from 6.19 before 7.0.4 — fixed in 6.18.27, 7.0.4

How to fix

Upgrade to a fixed version: Linux kernel 6.18.27, 7.0.4. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/2774bcf714739cc6bb86f8812167bb9fbda70f6a
• https://git.kernel.org/stable/c/357c6d084b6137ae640209c5bfd01180f985c015
• https://git.kernel.org/stable/c/c45b354911d01565156e38d7f6bc07edb51fc34c

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