CVE-2026-80893

Local hugetlb swap-entry corruption via wrong bit clear

Published Sep 4, 2026 · Updated Sep 4, 2026

Memory corruption in the Linux kernel allows local users to corrupt a child process's hugetlb swap entry during fork(). copy_hugetlb_page_range() uses huge_pte_clear_uffd_wp(), which clears a present-PTE bit position inside the nonpresent swap payload, advancing an encoded PFN by two pages on x86-64. A plain fork() must coincide with an in-flight hugetlb migration entry or a poisoned huge page; the skew is usually latent but can propagate when the corrupted offset is re-encoded.

CVSS severityUnavailable
Unscored
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory corruption in the Linux kernel allows local users to corrupt a child process's hugetlb swap entry during fork(). copy_hugetlb_page_range() uses huge_pte_clear_uffd_wp(), which clears a present-PTE bit position inside the nonpresent swap payload, advancing an encoded PFN by two pages on x86-64. A plain fork() must coincide with an in-flight hugetlb migration entry or a poisoned huge page; the skew is usually latent but can propagate when the corrupted offset is re-encoded.

The record

CVE
CVE-2026-80893
Published
Sep 4, 2026
Updated
Sep 4, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Sep 4, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 4, 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=5.19
  2. Affected versionversion=bc70fbf269fdff410b0b6d75c3770b9f59117b90 <2b9a07002c2f296aa6a9c591213933d3492e3089
  3. Affected versionversion=bc70fbf269fdff410b0b6d75c3770b9f59117b90 <2fa11c60c9c06bafc19cf4d9efdaa36a38079e87
  4. Affected versionversion=bc70fbf269fdff410b0b6d75c3770b9f59117b90 <69cb5825d9988c7944bc9f1dc08cb233655405a7
  5. Affected versionversion=bc70fbf269fdff410b0b6d75c3770b9f59117b90 <83abe2fd5b3aeb3123b5408a5a91709c5538fb23
  6. Affected versionversion=bc70fbf269fdff410b0b6d75c3770b9f59117b90 <8b0de7005b148738d79d6c45594d566489948a68
  7. Affected versionversion=bc70fbf269fdff410b0b6d75c3770b9f59117b90 <f1b1311c0352873137768bac5a126e491271a747

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.19; version=bc70fbf269fdff410b0b6d75c3770b9f59117b90 <2b9a07002c2f296aa6a9c591213933d3492e3089; version=bc70fbf269fdff410b0b6d75c3770b9f59117b90 <2fa11c60c9c06bafc19cf4d9efdaa36a38079e87; version=bc70fbf269fdff410b0b6d75c3770b9f59117b90 <69cb5825d9988c7944bc9f1dc08cb233655405a7; version=bc70fbf269fdff410b0b6d75c3770b9f59117b90 <83abe2fd5b3aeb3123b5408a5a91709c5538fb23; version=bc70fbf269fdff410b0b6d75c3770b9f59117b90 <8b0de7005b148738d79d6c45594d566489948a68; version=bc70fbf269fdff410b0b6d75c3770b9f59117b90 <f1b1311c0352873137768bac5a126e491271a747

Published CVSS scores

No CVSS assessment is available in this record.

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 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

No sourced classifications are available.

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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