VulnerabilityPublished 24 Apr 2026Updated 25 Aug 2026

CVE-2026-5367: Fast Datapath for Red Hat Enterprise Linux 10 · Improper Handling of Length Parameter Inconsistency

Affects Fast Datapath for Red Hat Enterprise Linux 10Source CVE Database V5

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Not known to be exploited · CVSS 8.6 High.

Data as of 30 Oct 2026, 11:52 UTC

CVSS 3.1 base score

8.6High

How severe the flaw is on the 0–10 CVSS scale.

EPSS: 0.8% chance of exploitation in 30 days – higher than 58% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:N/A:N

Attack Vector: Network
Attack Complexity: Low
Privileges Required: None
User Interaction: None
Scope: Changed
Confidentiality: High
Integrity: None
Availability: None

Bold values are the worst case: easiest to exploit or largest impact.

Attack Vector: Network: The vulnerable component is bound to the network stack and the set of possible attackers extends beyond the other options listed, up to and including the entire Internet. Such a vulnerability is often termed 'remotely exploitable' and can be thought of as an attack being exploitable at the protocol level one or more network hops away (e.g., across one or more routers).
Attack Complexity: Low: Specialized access conditions or extenuating circumstances do not exist. An attacker can expect repeatable success against the vulnerable component.
Privileges Required: None: The attacker is unauthorized prior to attack, and therefore does not require any access to settings or files to carry out an attack.
User Interaction: None: The vulnerable system can be exploited without any interaction from any user.
Scope: Changed: An exploited vulnerability can affect resources beyond the security scope managed by the security authority of the vulnerable component. In this case, the vulnerable component and the impacted component are different and managed by different security authorities.
Confidentiality: High: There is total loss of confidentiality, resulting in all resources within the impacted component being divulged to the attacker. Alternatively, access to only some restricted information is obtained, but the disclosed information presents a direct, serious impact.
Integrity: None: There is no loss of integrity within the impacted component.
Availability: None: There is no impact to availability within the impacted component.

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 24 Apr 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 30 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Affected software

Product	Affected	Fixed in
Red HatFast Datapath for Red Hat Enterprise Linux 10	Affected–	Fixed in–
Red HatFast Datapath for Red Hat Enterprise Linux 10	Affected–	Fixed in–
Red HatFast Datapath for Red Hat Enterprise Linux 8	Affected–	Fixed in–
Red HatFast Datapath for Red Hat Enterprise Linux 8	Affected–	Fixed in–
Red HatFast Datapath for Red Hat Enterprise Linux 9	Affected–	Fixed in–
Red HatFast Datapath for Red Hat Enterprise Linux 9	Affected–	Fixed in–

AI-suggested

Red Hat has released official security updates for ovn-2021 and ovn23.06 packages that address CVE-2026-5367. Users of Red Hat Enterprise Linux Fast Datapath 8 should apply these updates promptly. Detailed update instructions are available at https://access.redhat.com/articles/11258. Since this is an official fix, applying the vendor-provided patches fully mitigates the vulnerability. No additional mitigation steps are required beyond applying the security update.

Description

A flaw was found in OVN (Open Virtual Network). A remote attacker, by sending crafted DHCPv6 (Dynamic Host Configuration Protocol for IPv6) SOLICIT packets with an inflated Client ID length, could cause the ovn-controller to read beyond the bounds of a packet. This out-of-bounds read can lead to the disclosure of sensitive information stored in heap memory, which is then returned to the attacker's virtual machine port.

Impact

Successful exploitation of this vulnerability allows a remote attacker to cause the ovn-controller to read beyond packet boundaries, leading to disclosure of sensitive heap memory contents. This information disclosure can compromise confidentiality of data handled by the affected system. There is no impact on integrity or availability reported. The vulnerability can be exploited remotely without authentication or user interaction.

Summary

CVE-2026-5367 is an information disclosure vulnerability in OVN (Open Virtual Network) within Red Hat Enterprise Linux Fast Datapath 8. The issue arises from improper handling of length parameter inconsistencies in DHCPv6 SOLICIT packets, where an attacker can send packets with an inflated Client ID length. This causes the ovn-controller to read beyond the intended packet bounds, resulting in a heap over-read and disclosure of sensitive information to the attacker's virtual machine port. The vulnerability is tracked as CWE-130 (Improper Handling of Length Parameter). Red Hat has issued security advisories RHSA-2026:11694 and RHSA-2026:11695 providing updated ovn packages that fix this issue. The updates are available for multiple architectures including x86_64, ppc64le, s390x, and aarch64. The CVSS v3.1 base score is 8.6, indicating high severity with network attack vector, low attack complexity, no privileges required, no user interaction, and high confidentiality impact.

CWE-130Improper Handling of Length Parameter Inconsistency (opens in a new tab)
Base weakness
The product parses a formatted message or structure, but it does not handle or incorrectly handles a length field that is inconsistent with the actual length of the associated data.
Implementation
When processing structured incoming data containing a size field followed by raw data, ensure that you identify and resolve any inconsistencies between the size field and the actual size of the data.
Implementation
Do not let the user control the size of the buffer.
Implementation
Validate that the length of the user-supplied data is consistent with the buffer size.
OWASP Cheat Sheets
XML Security (opens in a new tab)
Mass Assignment (opens in a new tab)
OWASP ASVS 4.0.3
V13.3.1 (opens in a new tab)
V5.1.4 (opens in a new tab)
V5.1.3 (opens in a new tab)
Attack patterns
Buffer Overflow via Parameter Expansion (opens in a new tab)
From MITRE CWE, MITRE CAPEC and OWASP (Top 10, OpenCRE).

References

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 15 Jul 2026, 09:32 UTC

WeaknessesCWE-130

Technical details

References

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