CVE-2026-72340

Hardware rule corruption via cross-instance race

Published Aug 15, 2026 · Updated Aug 15, 2026

Incorrect synchronization in the Linux Microchip VCAP API allows local users to corrupt hardware rules via concurrent debugfs and tc access. Per-instance locks fail to serialize IS0 and IS2 accesses to the shared Super VCAP cache, letting a debugfs read replace a writer's cached data before commit. Reachability requires sparx5 or lan969x hardware, a full debugfs rule dump, and a concurrent privileged tc-flower write; the documented result is dump and hardware-entry corruption.

CVSS severity3.0
Low
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Incorrect synchronization in the Linux Microchip VCAP API allows local users to corrupt hardware rules via concurrent debugfs and tc access. Per-instance locks fail to serialize IS0 and IS2 accesses to the shared Super VCAP cache, letting a debugfs read replace a writer's cached data before commit. Reachability requires sparx5 or lan969x hardware, a full debugfs rule dump, and a concurrent privileged tc-flower write; the documented result is dump and hardware-entry corruption.

The record

CVE
CVE-2026-72340
Published
Aug 15, 2026
Updated
Aug 15, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-821
Attack vector
local
Privileges
admin

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=6.2
  2. Affected versionversion=71c9de995260222e739020104d477af4775a6d26 <1e71a40d101547380590db582213c1f1dce1f041
  3. Affected versionversion=71c9de995260222e739020104d477af4775a6d26 <49806bef9572a2e012610517bc14ed0a4db0d1fc
  4. Affected versionversion=71c9de995260222e739020104d477af4775a6d26 <786456d0a244bbd405dfc60e4de51f8b348b9cb1
  5. Affected versionversion=71c9de995260222e739020104d477af4775a6d26 <952928564cc5fdb06f92d7e25c6cd2e1d816362b
  6. Affected versionversion=71c9de995260222e739020104d477af4775a6d26 <d7a8d500d7e42837bd8dce40cb52c97c6e8706a9

What conditions does exploitation require?

Attack vectorlocal
Required privilegesadmin

What is affected?

The Linux Kernel Organization · Linuxversion=6.2; version=71c9de995260222e739020104d477af4775a6d26 <1e71a40d101547380590db582213c1f1dce1f041; version=71c9de995260222e739020104d477af4775a6d26 <49806bef9572a2e012610517bc14ed0a4db0d1fc; version=71c9de995260222e739020104d477af4775a6d26 <786456d0a244bbd405dfc60e4de51f8b348b9cb1; version=71c9de995260222e739020104d477af4775a6d26 <952928564cc5fdb06f92d7e25c6cd2e1d816362b; version=71c9de995260222e739020104d477af4775a6d26 <d7a8d500d7e42837bd8dce40cb52c97c6e8706a9

Published CVSS scores

3.0Amazon LinuxCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:L

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
Privilegesadmin
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-821Incorrect Synchronization

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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