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PatchSiren cyber security CVE debrief

CVE-2026-74282 Linux CVE debrief

A vulnerability in the Linux kernel's TIPC (Transparent Inter-Process Communication) module could allow an unauthenticated attacker to cause a denial-of-service condition on the affected system. The vulnerability is caused by an underflow condition when processing CONN_ACK messages, which can lead to a denial-of-service condition. Linux kernel developers, system administrators, and security teams should assess exposure and prioritize patch application and system updates. The vulnerability has a high impact on the system's availability and can be exploited by sending a specially crafted CONN_ACK message.

Vendor
Linux
Product
Unknown
CVSS
HIGH 7.5
CISA KEV
Not listed in stored evidence
Original CVE published
2026-08-15
Original CVE updated
2026-10-16
Advisory published
2026-08-15
Advisory updated
2026-10-16

Who should care

Linux kernel developers, system administrators, and security teams responsible for maintaining and securing Linux-based systems should assess exposure and prioritize patch application and system updates. The vulnerability has a high impact on the system's availability and can be exploited by sending a specially crafted CONN_ACK message, potentially causing a denial-of-service condition.

Why it matters

This vulnerability in the Linux kernel's TIPC module could allow an unauthenticated attacker to cause a denial-of-service condition on affected systems. Linux kernel developers, system administrators, and security teams should assess exposure and prioritize patch application and system updates.

  • Denial-of-service condition on affected systems
  • Potential for system crashes or instability
  • Need for patch application and system updates

Technical summary

The Linux kernel's TIPC module is vulnerable to an underflow condition when processing CONN_ACK messages. An attacker could exploit this vulnerability by sending a specially crafted CONN_ACK message, potentially causing a denial-of-service condition. The vulnerability has a high impact on the system's availability and can be mitigated by applying patches provided by the Linux kernel maintainers. The vulnerability affects Linux kernel developers, system administrators, and security teams responsible for maintaining and securing Linux-based systems.

Defensive priority

High

Recommended defensive actions

  • Review and apply the patches provided by the Linux kernel maintainers
  • Verify the system's TIPC configuration and ensure it is properly secured
  • Monitor system logs for potential exploitation attempts
  • Check relevant monitoring, detection, and logs for exposed assets that need extra review
  • Track exceptions, retest remediated assets, and close the item only after evidence is documented
  • Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
  • Plan vendor-supported updates or mitigations through normal change control where exposure is confirmed

Evidence notes

The CVE record and source item provide details about the vulnerability, including its description, affected versions, and references to source code changes. The Linux kernel's TIPC module is vulnerable to an underflow condition when processing CONN_ACK messages. The vulnerability can be exploited by sending a specially crafted CONN_ACK message, potentially causing a denial-of-service condition. The CVE record was published on 2026-08-15T05:57:52.048Z and has not been modified since then.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-74282 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-74282

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-74282 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-74282

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

  • tipc: prevent snt_unacked underflow on CONN_ACK

    Unverified legacy reference

    URL: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/74xxx/CVE-2026-74282.json

    cve_program_cvelist_v5

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/3388145d258cf2c4c98278e3987296007d30672e

    Supplemental source

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/67e55b054bf8025658dc0e255057f2a6236416bd

    Supplemental source

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/96f91b8ae1a489b3eca137e7acf42cf985fb8939

    Supplemental source

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/47ed873e4ceda34098bd46d8e96b4bb13cad3a04

    Supplemental source

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/b44bebdd32c9ff66ee2aebfc317ced44bedd9335

    Supplemental source

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/3cfa3d8e0dc167850edeb5bf5a07757db83fd54e

    Supplemental source

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/1e2c956745777e6ffdee7f30da5935741c03ee1e

    Supplemental source

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.