CVE-2026-93067

Memory corruption via unchecked AUX read length

Published Sep 17, 2026 · Updated Sep 17, 2026

Buffer overflow in the tc358767 driver in Linux 5.4 allows attackers to corrupt kernel memory via an oversized AUX byte count. tc_aux_transfer() substitutes the controller's AUX_BYTES count for the bounded request length, causing tc_aux_read_data() to overrun its 16-byte stack buffer and the caller buffer. Triggering requires an excessive controller-reported count on affected hardware; upstream describes defensive hardening and does not establish attacker control or a working exploit.

CVSS severity6.1
Medium
EPSS probability0.18%
Next 30 days · Oct 19, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Buffer overflow in the tc358767 driver in Linux 5.4 allows attackers to corrupt kernel memory via an oversized AUX byte count. tc_aux_transfer() substitutes the controller's AUX_BYTES count for the bounded request length, causing tc_aux_read_data() to overrun its 16-byte stack buffer and the caller buffer. Triggering requires an excessive controller-reported count on affected hardware; upstream describes defensive hardening and does not establish attacker control or a working exploit.

The record

CVE
CVE-2026-93067
Published
Sep 17, 2026
Updated
Sep 17, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Sep 17, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 17, 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=12dfe7c4d9c53442efcb4113cff505f60d654906 <33c0b072e31dee98a754d9bd01800359dfeb9e8f
  2. Affected versionversion=12dfe7c4d9c53442efcb4113cff505f60d654906 <424b762cc26d512e3e7421e57e41b4b55be2400b
  3. Affected versionversion=12dfe7c4d9c53442efcb4113cff505f60d654906 <57c567e0e8aa76f6e3e8f39d7f40c20bc37e76af
  4. Affected versionversion=12dfe7c4d9c53442efcb4113cff505f60d654906 <982caa744fce79d18f2920382aaeb0da821a6e73
  5. Affected versionversion=12dfe7c4d9c53442efcb4113cff505f60d654906 <9ff718df547372d70ca20ad8e66a3fb1300936b2
  6. Affected versionversion=12dfe7c4d9c53442efcb4113cff505f60d654906 <dd6274706bec30d005bff0587a4262d01dc2775a
  7. Affected versionversion=12dfe7c4d9c53442efcb4113cff505f60d654906 <ebf00c51c9ac9188e2806a2b842418805ee879be
  8. Affected versionversion=12dfe7c4d9c53442efcb4113cff505f60d654906 <ec6444a00c49e6c2b5e9a507272a28126677f9ee
  9. Affected versionversion=5.4

What conditions does exploitation require?

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

What is affected?

The Linux Kernel Organization · Linuxversion=12dfe7c4d9c53442efcb4113cff505f60d654906 <33c0b072e31dee98a754d9bd01800359dfeb9e8f; version=12dfe7c4d9c53442efcb4113cff505f60d654906 <424b762cc26d512e3e7421e57e41b4b55be2400b; version=12dfe7c4d9c53442efcb4113cff505f60d654906 <57c567e0e8aa76f6e3e8f39d7f40c20bc37e76af; version=12dfe7c4d9c53442efcb4113cff505f60d654906 <982caa744fce79d18f2920382aaeb0da821a6e73; version=12dfe7c4d9c53442efcb4113cff505f60d654906 <9ff718df547372d70ca20ad8e66a3fb1300936b2; version=12dfe7c4d9c53442efcb4113cff505f60d654906 <dd6274706bec30d005bff0587a4262d01dc2775a; version=12dfe7c4d9c53442efcb4113cff505f60d654906 <ebf00c51c9ac9188e2806a2b842418805ee879be; version=12dfe7c4d9c53442efcb4113cff505f60d654906 <ec6444a00c49e6c2b5e9a507272a28126677f9ee; version=5.4

Published CVSS scores

6.5Tenable NessusCVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H/E:U/RL:U/RC:C
6.4Tenable CVE databaseAV:N/AC:L/Au:N/C:P/I:N/A:P
7.1Tenable CVE databaseCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
6.1Amazon LinuxCVSS:3.1/AV:P/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H
7.1Tenable NessusCVSS:3.0/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
5.6Tenable NessusAV:L/AC:L/Au:N/C:P/I:N/A:C

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.

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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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