VulnerabilityPublished 24 Sep 2026Updated 21 Oct 2026

CVE-2026-93230: Linux kernel · mm/hugetlb: initialize gigantic bootmem hugepage struct pages earlier

Affects Linux kernelSource CVE Database V5

Not known to be exploited · fixed in b1b7c045e808c761b1cc8c19b3040fadedda3fef : update Linux kernel when convenient.

Data as of 27 Oct 2026, 05:11 UTC

Severity

Medium

Rated Medium by Threat Radar's AI analysis · CVSS not yet scored by NVD

EPSS: 0.1% chance of exploitation in 30 days – higher than 6% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in b1b7c045e808c761b1cc8c19b3040fadedda3fef, 09505232eced5f1c42902d8f28740f070c3fc6dc, 29968bc7aefb3cf1e72aa7c5f52697a6b0527094 +1

Exploitation evidence

Disclosed: evidence found.
CVE published 24 Sep 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade Linux kernel to b1b7c045e808c761b1cc8c19b3040fadedda3fef, 09505232eced5f1c42902d8f28740f070c3fc6dc, 29968bc7aefb3cf1e72aa7c5f52697a6b0527094 or 326de479ab5942fb4a4aa4f20c716045434fcd6b.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ fde1c4ecf91640e5a95ec36b71ec2e8ec379ce40, < b1b7c045e808c761b1cc8c19b3040fadedda3fef	Fixed in b1b7c045e808c761b1cc8c19b3040fadedda3fef
LinuxLinux	Affected ≥ fde1c4ecf91640e5a95ec36b71ec2e8ec379ce40, < 09505232eced5f1c42902d8f28740f070c3fc6dc	Fixed in 09505232eced5f1c42902d8f28740f070c3fc6dc
LinuxLinux	Affected ≥ fde1c4ecf91640e5a95ec36b71ec2e8ec379ce40, < 29968bc7aefb3cf1e72aa7c5f52697a6b0527094	Fixed in 29968bc7aefb3cf1e72aa7c5f52697a6b0527094
LinuxLinux	Affected ≥ fde1c4ecf91640e5a95ec36b71ec2e8ec379ce40, < 326de479ab5942fb4a4aa4f20c716045434fcd6b	Fixed in 326de479ab5942fb4a4aa4f20c716045434fcd6b
LinuxLinux	Affected =6.7	Fixed in–

AI-suggested

This vulnerability has been fixed in the Linux kernel. The fix initializes gigantic bootmem HugeTLB struct pages earlier in the boot process (in page_alloc_init_late()) to ensure valid struct page state before zone contiguity evaluation. Users should update to a Linux kernel version that includes the fix identified by the commits b1b7c045e808c761b1cc8c19b3040fadedda3fef, 09505232eced5f1c42902d8f28740f070c3fc6dc, 29968bc7aefb3cf1e72aa7c5f52697a6b0527094, or 326de479ab5942fb4a4aa4f20c716045434fcd6b. No additional mitigation steps are indicated.

Description

CVE-2026-93230 is a Linux kernel vulnerability involving the initialization timing of gigantic bootmem HugeTLB struct pages. The issue arises because these pages were initialized later than other memory structures, causing the page allocator to potentially observe uninitialized struct pages during early boot. This could lead to incorrect zone contiguity computation and may trigger early boot panics if additional poisoned-page checks are enabled. The flaw has been fixed by initializing these struct pages earlier in the boot process, ensuring valid page state before zone contiguity evaluation.

Impact

Incorrect initialization timing of HugeTLB struct pages can cause the kernel to compute wrong zone contiguity states during early boot, potentially leading to early boot panics if poisoned-page checks are enabled. This affects system stability during boot but does not indicate direct exploitation or data compromise. No known exploits in the wild have been reported.

Summary

The vulnerability in the Linux kernel concerns the initialization order of gigantic bootmem HugeTLB struct pages. Previously, these pages were initialized in hugetlb_init(), which runs after page_alloc_init_late(). Since page_alloc_init_late() inspects pageblocks to determine zone contiguity, it could encounter uninitialized struct pages if a bootmem HugeTLB region is marked noinit. This leads to incorrect zone contiguity state calculations and may cause early boot panics when poisoned-page checks like PF_POISONED_CHECK() are present. The fix moves the initialization of these struct pages to page_alloc_init_late(), ensuring proper initialization before zone contiguity is evaluated and preventing these issues.

References

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 26 Oct 2026, 20:10 UTC

Technical details

References

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