CVE-2026-64352

Local console flooding via invalid RCU checks

Published Jul 25, 2026 · Updated Jul 25, 2026

Incorrect synchronization in Linux Kernel allows local users to flood debug-kernel consoles through sleepable BPF LPM-trie access. trie_lookup_elem() checks only classic or BH RCU state, while trie_update_elem() and trie_delete_elem() use plain rcu_dereference() despite sleepable programs holding only Tasks Trace RCU. The effect requires a debug kernel and a sleepable BPF LSM hook that touches an LPM trie; it produces repeated lockdep warnings but no use-after-free.

CVSS severity5.5
Medium
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

Incorrect synchronization in Linux Kernel allows local users to flood debug-kernel consoles through sleepable BPF LPM-trie access. trie_lookup_elem() checks only classic or BH RCU state, while trie_update_elem() and trie_delete_elem() use plain rcu_dereference() despite sleepable programs holding only Tasks Trace RCU. The effect requires a debug kernel and a sleepable BPF LSM hook that touches an LPM trie; it produces repeated lockdep warnings but no use-after-free.

The record

CVE
CVE-2026-64352
Published
Jul 25, 2026
Updated
Jul 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-821, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 25, 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=5.14
  2. Affected versionversion=694cea395fded425008e93cd90cfdf7a451674af <2f884d371fafea137afea504d49ee4a7c8d7985b
  3. Affected versionversion=694cea395fded425008e93cd90cfdf7a451674af <304ca50582f0c047370f85e13caec456f78c9fcc
  4. Affected versionversion=694cea395fded425008e93cd90cfdf7a451674af <57454944737f3ad9a8703aecbbb79713b513a94b
  5. Affected versionversion=694cea395fded425008e93cd90cfdf7a451674af <9bfdf4b81b0e56d47bc6c46c34a46638be716695
  6. Affected versionversion=694cea395fded425008e93cd90cfdf7a451674af <bd6ad9a6b30498d845413e863fb95c6fab3babe3
  7. Affected versionversion=694cea395fded425008e93cd90cfdf7a451674af <ec662a8b2cde01e76b37ccd4b992d0342299e69c
  8. Affected versionversion=694cea395fded425008e93cd90cfdf7a451674af <f0967d4f1ba4323a3cb7dc8fdba74dd3a8caaf04

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=5.14; version=694cea395fded425008e93cd90cfdf7a451674af <2f884d371fafea137afea504d49ee4a7c8d7985b; version=694cea395fded425008e93cd90cfdf7a451674af <304ca50582f0c047370f85e13caec456f78c9fcc; version=694cea395fded425008e93cd90cfdf7a451674af <57454944737f3ad9a8703aecbbb79713b513a94b; version=694cea395fded425008e93cd90cfdf7a451674af <9bfdf4b81b0e56d47bc6c46c34a46638be716695; version=694cea395fded425008e93cd90cfdf7a451674af <bd6ad9a6b30498d845413e863fb95c6fab3babe3; version=694cea395fded425008e93cd90cfdf7a451674af <ec662a8b2cde01e76b37ccd4b992d0342299e69c; version=694cea395fded425008e93cd90cfdf7a451674af <f0967d4f1ba4323a3cb7dc8fdba74dd3a8caaf04

Published CVSS scores

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:N/A:L

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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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-821Incorrect Synchronization
T1499Endpoint Denial of Service

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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