CVE-2026-43286

Local hugeTLB allocation denial via leaked accounting

Published May 8, 2026 · Updated May 8, 2026

Resource exhaustion in affected Linux kernel builds allows local users to make configured hugetlb subpools reject future page allocations. When hugetlb_acct_memory() cannot obtain globally requested pages, the failure path subtracts only reserved pages and leaves spool->used_hpages elevated. Repeated failed requests exhaust the configured subpool maximum; the failure affects hugeTLB availability without crashing the kernel or consuming pages.

CVSS severity5.5
Medium
EPSS probability0.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Resource exhaustion in affected Linux kernel builds allows local users to make configured hugetlb subpools reject future page allocations. When hugetlb_acct_memory() cannot obtain globally requested pages, the failure path subtracts only reserved pages and leaves spool->used_hpages elevated. Repeated failed requests exhaust the configured subpool maximum; the failure affects hugeTLB availability without crashing the kernel or consuming pages.

The record

CVE
CVE-2026-43286
Published
May 8, 2026
Updated
May 8, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-401, T1499.001
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 8, 2026CVE publishedPublication date reported by the CVE source.
  2. May 8, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=6.15
  2. Affected versionversion=a833a693a490ecff8ba377654c6d4d333718b6b1 <1d3f9bb4c8af70304d19c22e30f5d16a2d589bb5
  3. Affected versionversion=a833a693a490ecff8ba377654c6d4d333718b6b1 <5eac1322a7b14b8cd05ec896618278b90fba7f39
  4. Affected versionversion=a833a693a490ecff8ba377654c6d4d333718b6b1 <f055897c975d079a90af873c791ab58cf0f6f2a5
  5. Affected versionversion=adb5c2e55524e3a96b02c3904b0bb6d5a5404d21

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=6.15; version=a833a693a490ecff8ba377654c6d4d333718b6b1 <1d3f9bb4c8af70304d19c22e30f5d16a2d589bb5; version=a833a693a490ecff8ba377654c6d4d333718b6b1 <5eac1322a7b14b8cd05ec896618278b90fba7f39; version=a833a693a490ecff8ba377654c6d4d333718b6b1 <f055897c975d079a90af873c791ab58cf0f6f2a5; version=adb5c2e55524e3a96b02c3904b0bb6d5a5404d21

Published CVSS scores

5.5NISTCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-401Missing Release of Memory after Effective Lifetime
T1499.001OS Exhaustion Flood

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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