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CVE-2026-31662

7.5 · HIGH

In the Linux kernel, the following vulnerability has been resolved: tipc: fix bc_ackers underflow on duplicate GRP_ACK_MSG The GRP_ACK_MSG handler in tipc_group_proto_rcv() currently decrements b…

Published Apr 24, 2026CWE-191EPSS 0.39%

Overview

CVE-2026-31662 is a high-severity vulnerability. It was published on April 24, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

Technical description

In the Linux kernel, the following vulnerability has been resolved:

tipc: fix bc_ackers underflow on duplicate GRP_ACK_MSG

The GRP_ACK_MSG handler in tipc_group_proto_rcv() currently decrements

bc_ackers on every inbound group ACK, even when the same member has

already acknowledged the current broadcast round.

Because bc_ackers is a u16, a duplicate ACK received after the last

legitimate ACK wraps the counter to 65535. Once wrapped,

tipc_group_bc_cong() keeps reporting congestion and later group

broadcasts on the affected socket stay blocked until the group is

recreated.

Fix this by ignoring duplicate or stale ACKs before touching bc_acked or

bc_ackers. This makes repeated GRP_ACK_MSG handling idempotent and

prevents the underflow path.

Remediation

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

References

Refgit.kernel.org/stable/c/1b6f13f626665cac67ba5a012765427680518711Refgit.kernel.org/stable/c/36ec4fdd6250dcd5e73eb09ea92ed92e9cc28412Refgit.kernel.org/stable/c/3bcf7aca63f0bcd679ae28e9b99823c608e59ce3Refgit.kernel.org/stable/c/48a5fe38772b6f039522469ee6131a67838221a8Refgit.kernel.org/stable/c/575faea557f1a184a5f09661bd47ebd3ef3769f8Refgit.kernel.org/stable/c/a2ea1ef0167d7a84730638d05c20ccdc421b14b6Refgit.kernel.org/stable/c/a7db57ccca21f5801609065473c89a38229ecb92Refgit.kernel.org/stable/c/e0bb732eaf77f9ac2f2638bdac9e39b81e0a9682

How CyberStrike helps

Frequently asked questions

What is CVE-2026-31662?

CVE-2026-31662 is a high-severity vulnerability. It was published on April 24, 2026 and has a CVSS 3.1 base score of 7.5 (HIGH).

How severe is CVE-2026-31662?

This vulnerability has a CVSS 3.1 base score of 7.5, rated HIGH. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-31662?

Check the references section for vendor advisories, patches, and mitigation guidance. If immediate patching is not possible, review the CVSS vector to understand the attack surface and apply compensating controls such as network segmentation or access restrictions.

How can CyberStrike help with CVE-2026-31662?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-31662 is actually reachable in your own applications and APIs, then verifies each finding before reporting it. That tells you if the weakness is a real, exploitable risk in your environment or a false positive you can safely deprioritize.

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