CVE-2026-99100

Out-of-bounds reads via unchecked firmware record lengths

Published Oct 28, 2026 · Updated Oct 28, 2026

Out-of-bounds reads in Linux p54 allow attackers to trigger reads past firmware records via malformed firmware images. The p54_parse_firmware function reads component ID and version fields without validating record lengths and accepts descriptor values that underflow the RX offset or leave an empty RX range. Triggering requires malformed firmware to reach the driver during firmware loading; the sources do not establish attacker-visible disclosure or a specific crash outcome.

CVSS severityUnavailable
Unscored
EPSS probability0.17%
Next 30 days · Nov 1, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds reads in Linux p54 allow attackers to trigger reads past firmware records via malformed firmware images. The p54_parse_firmware function reads component ID and version fields without validating record lengths and accepts descriptor values that underflow the RX offset or leave an empty RX range. Triggering requires malformed firmware to reach the driver during firmware loading; the sources do not establish attacker-visible disclosure or a specific crash outcome.

The record

CVE
CVE-2026-99100
Published
Oct 28, 2026
Updated
Oct 28, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Oct 28, 2026CVE publishedPublication date reported by the CVE source.
  2. Oct 28, 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=0 <6.18.59
  2. Affected versionversion=0 <7.2.13
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <8c4f962f368d5e17481f3c2c5a43028953e137a5
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <db7b86bd97b380ece8fa39cfdd7502a9fd35e56f
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <f641066b0ddcd1b0cf007c0d04f9c966f6e888ae

What conditions does exploitation require?

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

What is affected?

The Linux Kernel Organization · Linuxversion=0 <6.18.59; version=0 <7.2.13; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <8c4f962f368d5e17481f3c2c5a43028953e137a5; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <db7b86bd97b380ece8fa39cfdd7502a9fd35e56f; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <f641066b0ddcd1b0cf007c0d04f9c966f6e888ae

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.

Activity data is delayed. The latest report is Sep 28, 2026.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 22, 2026Sep 28, 2026
Latest reporting daySep 28, 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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