CVE-2023-35788

Local privilege escalation via Geneve option overflow

Published Jun 16, 2023 · Updated May 5, 2025

An out-of-bounds write in the Linux kernel before 6.3.7 allows local users to escalate privileges through crafted Geneve options. At 252 accumulated bytes, fl_set_geneve_opt makes opt->length overlap key->enc_opts.len; parsing a third option resets the length and lets memcpy write beyond enc_opts.data. Low-privileged local access is required, and successful memory corruption can also crash the system.

CVSS severity7.8
High
EPSS probability0.53%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

An out-of-bounds write in the Linux kernel before 6.3.7 allows local users to escalate privileges through crafted Geneve options. At 252 accumulated bytes, fl_set_geneve_opt makes opt->length overlap key->enc_opts.len; parsing a third option resets the length and lets memcpy write beyond enc_opts.data. Low-privileged local access is required, and successful memory corruption can also crash the system.

The record

CVE
CVE-2023-35788
Published
Jun 16, 2023
Updated
May 5, 2025
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-787, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 16, 2023CVE publishedPublication date reported by the CVE source.
  2. May 5, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

7.8CISA-ADPCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.4SUSECVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:H/A:H
7.8NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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.

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

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-787Out-of-bounds Write
T1068Exploitation for Privilege Escalation

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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