CVE-2026-80835

Non-random output via unsynchronized RNG interfaces

Published Sep 4, 2026 · Updated Sep 4, 2026

Race condition in affected Linux kernel qcom-rng releases allows attackers to obtain repeated or non-random hardware RNG output. qcom_rng_generate() synchronizes with itself but not with qcom_hwrng_read(), allowing both paths to access the same device registers concurrently. Exposure requires Qualcomm RNG hardware and simultaneous use of crypto_rng and hwrng; the AF_ALG rng consumer is reportedly unused in practice.

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

Race condition in affected Linux kernel qcom-rng releases allows attackers to obtain repeated or non-random hardware RNG output. qcom_rng_generate() synchronizes with itself but not with qcom_hwrng_read(), allowing both paths to access the same device registers concurrently. Exposure requires Qualcomm RNG hardware and simultaneous use of crypto_rng and hwrng; the AF_ALG rng consumer is reportedly unused in practice.

The record

CVE
CVE-2026-80835
Published
Sep 4, 2026
Updated
Sep 4, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-362
Attack vector
local
Privileges
Unavailable

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=6.7
  2. Affected versionversion=f29cd5bb64c258f29b4c49452532481f50eb43ca <14d9ee8286460a7b82f3b8610b5c7ebf4550b06b
  3. Affected versionversion=f29cd5bb64c258f29b4c49452532481f50eb43ca <2ecdf5c9910e20f73639bc322f0518a3439d17c0
  4. Affected versionversion=f29cd5bb64c258f29b4c49452532481f50eb43ca <669d940351eda316b82e24986e2e0e057653ce7d
  5. Affected versionversion=f29cd5bb64c258f29b4c49452532481f50eb43ca <843e2bdaf8deb8bc341203094dfe582e38ea4af2
  6. Affected versionversion=f29cd5bb64c258f29b4c49452532481f50eb43ca <bb474dcd9d0224264a27a60891f00872b879835f

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=6.7; version=f29cd5bb64c258f29b4c49452532481f50eb43ca <14d9ee8286460a7b82f3b8610b5c7ebf4550b06b; version=f29cd5bb64c258f29b4c49452532481f50eb43ca <2ecdf5c9910e20f73639bc322f0518a3439d17c0; version=f29cd5bb64c258f29b4c49452532481f50eb43ca <669d940351eda316b82e24986e2e0e057653ce7d; version=f29cd5bb64c258f29b4c49452532481f50eb43ca <843e2bdaf8deb8bc341203094dfe582e38ea4af2; version=f29cd5bb64c258f29b4c49452532481f50eb43ca <bb474dcd9d0224264a27a60891f00872b879835f

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.

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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
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-362Concurrent Execution using Shared Resource with Improper Synchronization ('Race Condition')

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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