CVE-2026-72043

Local data corruption via lost dirty-page state

Published Aug 15, 2026 · Updated Aug 15, 2026

Dirty-page tracking failure in Linux on LoongArch allows local users to corrupt data during copy-on-write page reclamation. With hardware page-table walking enabled, pte_wrprotect() and pmd_wrprotect() clear _PAGE_DIRTY without first preserving it in _PAGE_MODIFIED, so reclaim treats a modified page as clean. The sequence requires a local account, LoongArch hardware PTW, a private anonymous mapping, MADV_FREE followed by a write and fork or clone, and memory pressure; affected pages can be freed without writeback.

CVSS severity7.1
High
EPSS probability0.16%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Dirty-page tracking failure in Linux on LoongArch allows local users to corrupt data during copy-on-write page reclamation. With hardware page-table walking enabled, pte_wrprotect() and pmd_wrprotect() clear _PAGE_DIRTY without first preserving it in _PAGE_MODIFIED, so reclaim treats a modified page as clean. The sequence requires a local account, LoongArch hardware PTW, a private anonymous mapping, MADV_FREE followed by a write and fork or clone, and memory pressure; affected pages can be freed without writeback.

The record

CVE
CVE-2026-72043
Published
Aug 15, 2026
Updated
Aug 15, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-911, T1485
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=09cfefb7fa70c3af011b0db0a513fd80b2f18abc <018e9828eb523c638fa3d9bdf0fd4956b74555b2
  2. Affected versionversion=09cfefb7fa70c3af011b0db0a513fd80b2f18abc <39bb21a4bff0d70058bf752d7b5aa2e2ccc864a9
  3. Affected versionversion=09cfefb7fa70c3af011b0db0a513fd80b2f18abc <76f88650763a35cbf1384c65d66d096fa31cc58d
  4. Affected versionversion=09cfefb7fa70c3af011b0db0a513fd80b2f18abc <a65f49b6f7ece756394f8f0e85570020e7fd0e35
  5. Affected versionversion=09cfefb7fa70c3af011b0db0a513fd80b2f18abc <e483da960892c41fa7f0cf0d2fc2410d65a483d6
  6. Affected versionversion=09cfefb7fa70c3af011b0db0a513fd80b2f18abc <e8a916579e427af32f2de8213dfa23c5df6e6664
  7. Affected versionversion=5.19

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=09cfefb7fa70c3af011b0db0a513fd80b2f18abc <018e9828eb523c638fa3d9bdf0fd4956b74555b2; version=09cfefb7fa70c3af011b0db0a513fd80b2f18abc <39bb21a4bff0d70058bf752d7b5aa2e2ccc864a9; version=09cfefb7fa70c3af011b0db0a513fd80b2f18abc <76f88650763a35cbf1384c65d66d096fa31cc58d; version=09cfefb7fa70c3af011b0db0a513fd80b2f18abc <a65f49b6f7ece756394f8f0e85570020e7fd0e35; version=09cfefb7fa70c3af011b0db0a513fd80b2f18abc <e483da960892c41fa7f0cf0d2fc2410d65a483d6; version=09cfefb7fa70c3af011b0db0a513fd80b2f18abc <e8a916579e427af32f2de8213dfa23c5df6e6664; version=5.19

Published CVSS scores

7.1Linux Kernel CNACVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:N
4.4SUSECVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L
4.8SUSECVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N
5.5Red HatCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
3.3Amazon LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:N

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-911Improper Update of Reference Count
T1485Data Destruction

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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