CVE-2026-80949

Kernel memory leak via SDIO read errors

Published Sep 11, 2026 · Updated Sep 11, 2026

Memory leakage in affected Linux kernels allows attackers to retain kernel memory through failed brcmfmac SDIO control reads. The brcmf_sdio_read_control function allocates buf but returns from some error paths without calling vfree on that allocation. Reachability requires the brcmfmac SDIO control path and a read failure; published material establishes retained memory but not attacker control or a crash.

CVSS severityUnavailable
Unscored
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

Memory leakage in affected Linux kernels allows attackers to retain kernel memory through failed brcmfmac SDIO control reads. The brcmf_sdio_read_control function allocates buf but returns from some error paths without calling vfree on that allocation. Reachability requires the brcmfmac SDIO control path and a read failure; published material establishes retained memory but not attacker control or a crash.

The record

CVE
CVE-2026-80949
Published
Sep 11, 2026
Updated
Sep 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Sep 11, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 11, 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=3.8
  2. Affected versionversion=dd43a01c5cdb811adeb09e6a2d2788f8aa0d0969 <0d10db8e94fcb23a799789aaa696b4d8f937e207
  3. Affected versionversion=dd43a01c5cdb811adeb09e6a2d2788f8aa0d0969 <261d7c7610b4b2f476382c88a2d1ae0cc5e07add
  4. Affected versionversion=dd43a01c5cdb811adeb09e6a2d2788f8aa0d0969 <ba04715ee672c336272be3ceb43bda9ffc33eb75
  5. Affected versionversion=dd43a01c5cdb811adeb09e6a2d2788f8aa0d0969 <fdb880a7d575efe8b5c7b5b819b96d9251a3937f

What conditions does exploitation require?

Attack vectorUnavailable in this record.
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=3.8; version=dd43a01c5cdb811adeb09e6a2d2788f8aa0d0969 <0d10db8e94fcb23a799789aaa696b4d8f937e207; version=dd43a01c5cdb811adeb09e6a2d2788f8aa0d0969 <261d7c7610b4b2f476382c88a2d1ae0cc5e07add; version=dd43a01c5cdb811adeb09e6a2d2788f8aa0d0969 <ba04715ee672c336272be3ceb43bda9ffc33eb75; version=dd43a01c5cdb811adeb09e6a2d2788f8aa0d0969 <fdb880a7d575efe8b5c7b5b819b96d9251a3937f

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)
VectorUnavailable
PrivilegesUnavailable
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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