VulnerabilityPublished 24 Sep 2026Updated 21 Oct 2026

CVE-2026-93228: Linux kernel · svcrdma: Reject Write/Reply chunks with segcount 0

Affects Linux kernelSource CVE Database V5

Not known to be exploited · CVSS 9.1 Critical · fixed in fe533ae1bed2ef2b3d54ee7ab410da1874ed3d4f : patch Linux kernel as a priority.

Data as of 26 Oct 2026, 20:10 UTC

CVSS 3.1 base score

9.1Critical

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

EPSS: 0.4% chance of exploitation in 30 days – higher than 40% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in fe533ae1bed2ef2b3d54ee7ab410da1874ed3d4f, a798714b58041e88716db3bf8fb03ae13eecd54a, 9808eb7656666acc7291bae9ab6b987bd16e47e0 +2

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

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

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: Unchanged: An exploited vulnerability can only affect resources managed by the same security authority. In this case, the vulnerable component and the impacted component are either the same, or both are managed by the same security authority.
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: High: There is total loss of availability, resulting in the attacker being able to fully deny access to resources in the impacted component; this loss is either sustained (while the attacker continues to deliver the attack) or persistent (the condition persists even after the attack has completed). Alternatively, the attacker has the ability to deny some availability, but the loss of availability presents a direct, serious consequence to the impacted component (e.g., the attacker cannot disrupt existing connections, but can prevent new connections; the attacker can repeatedly exploit a vulnerability that, in each instance of a successful attack, leaks a only small amount of memory, but after repeated exploitation causes a service to become completely unavailable).

Definitions: FIRST CVSS v3.1 specification.

Exploitation evidence

Disclosed: evidence found.
CVE published 24 Sep 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: 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 26 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.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, 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

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 78147ca8b4a9b6cf0e597ddd6bf17959e08376c2, < fe533ae1bed2ef2b3d54ee7ab410da1874ed3d4f	Fixed in fe533ae1bed2ef2b3d54ee7ab410da1874ed3d4f
LinuxLinux	Affected ≥ 78147ca8b4a9b6cf0e597ddd6bf17959e08376c2, < a798714b58041e88716db3bf8fb03ae13eecd54a	Fixed in a798714b58041e88716db3bf8fb03ae13eecd54a
LinuxLinux	Affected ≥ 78147ca8b4a9b6cf0e597ddd6bf17959e08376c2, < 9808eb7656666acc7291bae9ab6b987bd16e47e0	Fixed in 9808eb7656666acc7291bae9ab6b987bd16e47e0
LinuxLinux	Affected ≥ 78147ca8b4a9b6cf0e597ddd6bf17959e08376c2, < 45dbdb2637b7fc5f1355b588780d2a7fb0516805	Fixed in 45dbdb2637b7fc5f1355b588780d2a7fb0516805
LinuxLinux	Affected ≥ 78147ca8b4a9b6cf0e597ddd6bf17959e08376c2, < 28c5a3a572f6cf81ac304459cfd515480995d62a	Fixed in 28c5a3a572f6cf81ac304459cfd515480995d62a
LinuxLinux	Affected =5.11	Fixed in–

AI-suggested

A fix is available and has been applied in the Linux kernel commits identified by the fixedVersions hashes. Users should update to a Linux kernel version that includes these fixes to mitigate the vulnerability. No additional mitigation is required as the patch rejects malformed zero-segment chunks and ensures only fully populated chunks are processed.

Description

CVE-2026-93228 is a critical vulnerability in the Linux kernel's svcrdma module where Write or Reply chunks with a segcount of zero were improperly accepted. This flaw allowed malformed chunks with zero segments to be linked into parsed chunk lists, potentially leading to denial of service. The issue was addressed by rejecting such zero-segment chunks at the decode boundary and reordering code to ensure only fully-populated chunks are processed. Legitimate clients are not affected as RFC 8166 does not define Write/Reply chunks with zero segments.

Impact

This vulnerability can lead to malformed zero-segment chunks being processed by the svcrdma kernel module, potentially causing denial of service or memory corruption due to incomplete chunk handling. The CVSS score of 9.1 indicates a critical severity with network attack vector, low attack complexity, no privileges required, no user interaction, and high confidentiality and availability impact. Legitimate clients are not affected as the protocol does not define zero-segment chunks.

References

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 26 Oct 2026, 20:10 UTC

Technical details

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