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CVE-2026-52993

9.8 · CRITICAL

In the Linux kernel, the following vulnerability has been resolved: tipc: fix double-free in tipc_buf_append() tipc_msg_validate() can potentially reallocate the skb it is validating, freeing the…

Published Jun 24, 2026CWE-415EPSS 0.40%

Overview

CVE-2026-52993 is a critical-severity vulnerability. It was published on June 24, 2026 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. 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 double-free in tipc_buf_append()

tipc_msg_validate() can potentially reallocate the skb it is validating,

freeing the old one. In tipc_buf_append(), it was being called with a

pointer to a local variable which was a copy of the caller's skb

pointer.

If the skb was reallocated and validation subsequently failed, the error

handling path would free the original skb pointer, which had already

been freed, leading to double-free.

Fix this by checking if head now points to a newly allocated reassembled

skb. If it does, reassign *headbuf for later freeing operations.

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/0274f24485fc38032d4093e463dc3ff5c7a667c9Refgit.kernel.org/stable/c/1d5e589055880fae229e229e1929e087dbe08cf3Refgit.kernel.org/stable/c/29940fff14110ca48c5ccc168d121665b51bb778Refgit.kernel.org/stable/c/4d104882bc815d4ec666ace9155f5f52715879a6Refgit.kernel.org/stable/c/4ee4deadaae7cb2e3d53af0fc889cf92a73413c0Refgit.kernel.org/stable/c/a438975a6dcdbd70865978c021650d1485586f0bRefgit.kernel.org/stable/c/d293ca716e7d5dffdaecaf6b9b2f857a33dc3d3aRefgit.kernel.org/stable/c/d3556656c6daebf8def751c7e71d11dd0a180d24Refaccess.redhat.com/errata/RHSA-2026:45115Refaccess.redhat.com/errata/RHSA-2026:45116

How CyberStrike helps

Frequently asked questions

What is CVE-2026-52993?

CVE-2026-52993 is a critical-severity vulnerability. It was published on June 24, 2026 and has a CVSS 3.1 base score of 9.8 (CRITICAL).

How severe is CVE-2026-52993?

This vulnerability has a CVSS 3.1 base score of 9.8, rated CRITICAL. It can be exploited remotely over the network. No authentication or special privileges are required for exploitation.

How do I fix or remediate CVE-2026-52993?

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-2026-52993?

CyberStrike is an open-source, AI-augmented pentesting engine. Rather than flag a version number, it tests whether an issue like CVE-2026-52993 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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