CVE-2026-74518

Host crash via stale hugetlb cache list

Published Aug 15, 2026 · Updated Aug 15, 2026

Race condition in the Linux kernel 5.10 and later allows local users to crash the host through concurrent shared hugetlbfs mappings. In mm/hugetlb.c, allocate_file_region_entries() uses list_splice() without reinitializing its stack-local source head, so a retry adds through a stale pointer and corrupts the reservation cache. Triggering the retry requires concurrent region operations on one shared resv_map; debug builds panic immediately, while other builds retain a kernel-stack pointer that later becomes a use-after-free.

CVSS severity7.8
High
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Race condition in the Linux kernel 5.10 and later allows local users to crash the host through concurrent shared hugetlbfs mappings. In mm/hugetlb.c, allocate_file_region_entries() uses list_splice() without reinitializing its stack-local source head, so a retry adds through a stale pointer and corrupts the reservation cache. Triggering the retry requires concurrent region operations on one shared resv_map; debug builds panic immediately, while other builds retain a kernel-stack pointer that later becomes a use-after-free.

The record

CVE
CVE-2026-74518
Published
Aug 15, 2026
Updated
Aug 15, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-367, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 15, 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=5.10
  2. Affected versionversion=d3ec7b6e09e512ba902b86bcca2c512fb06d492f <126a70bf1a08ddc9d79c471ebdaa2b08cfbab8df
  3. Affected versionversion=d3ec7b6e09e512ba902b86bcca2c512fb06d492f <587a0accc2b4fccc5cf7baf0fe34e50efde51f9c
  4. Affected versionversion=d3ec7b6e09e512ba902b86bcca2c512fb06d492f <62e1c2741a4d923d9854efd5927a6212aad7a187
  5. Affected versionversion=d3ec7b6e09e512ba902b86bcca2c512fb06d492f <ac1bb7fd45088d0db57a22ce7729f258ebd63cf5
  6. Affected versionversion=d3ec7b6e09e512ba902b86bcca2c512fb06d492f <dd9623f58ec702a07b2d67179d6fcea79c52231a

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.10; version=d3ec7b6e09e512ba902b86bcca2c512fb06d492f <126a70bf1a08ddc9d79c471ebdaa2b08cfbab8df; version=d3ec7b6e09e512ba902b86bcca2c512fb06d492f <587a0accc2b4fccc5cf7baf0fe34e50efde51f9c; version=d3ec7b6e09e512ba902b86bcca2c512fb06d492f <62e1c2741a4d923d9854efd5927a6212aad7a187; version=d3ec7b6e09e512ba902b86bcca2c512fb06d492f <ac1bb7fd45088d0db57a22ce7729f258ebd63cf5; version=d3ec7b6e09e512ba902b86bcca2c512fb06d492f <dd9623f58ec702a07b2d67179d6fcea79c52231a

Published CVSS scores

7.8Red HatCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8CanonicalCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-367Time-of-check Time-of-use (TOCTOU) Race Condition
T1499.004Application or System Exploitation

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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