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PatchSiren cyber security CVE debrief

CVE-2026-98819 Linux CVE debrief

The Linux kernel's Bluetooth btintel component has a vulnerability in DDC record length validation. This issue can cause problems with Intel_Write_DDC. The vulnerability was reported by Claude Mythos and has been resolved in the Linux kernel. Affected Linux system administrators and developers should assess exposure and apply patches to prevent potential issues with DDC record length validation. The vulnerability allows for potential issues with DDC record handling, which can be mitigated by proper validation and patching.

Vendor
Linux
Product
Unknown
CVSS
Unknown
CISA KEV
Not listed in stored evidence
Original CVE published
2026-10-18
Original CVE updated
2026-10-21
Advisory published
2026-10-18
Advisory updated
2026-10-21

Who should care

Linux system administrators and developers using Bluetooth btintel should assess exposure and apply patches to prevent potential issues with DDC record length validation. They should review Linux kernel versions for exposure, validate DDC record lengths in Bluetooth btintel, and apply patches from Linux kernel stable branches. Security teams and vulnerability management teams should also review the vulnerability and assess exposure.

Why it matters

Linux kernel vulnerability in Bluetooth btintel DDC record length validation requires assessment and patching to prevent potential issues.

  • Validate DDC record lengths to prevent potential issues with Intel_Write_DDC
  • Assess Linux kernel versions for exposure and apply patches
  • Review Bluetooth btintel configuration for proper DDC record handling

Technical summary

The Linux kernel's Bluetooth btintel component does not properly validate DDC record lengths, which can lead to issues with Intel_Write_DDC. This vulnerability was reported by Claude Mythos and has been resolved in the Linux kernel. The vulnerability allows for potential issues with DDC record handling, which can be mitigated by proper validation and patching. Affected Linux system administrators and developers should assess exposure and apply patches to prevent potential issues with DDC record length validation. The vulnerability has been resolved in the Linux kernel.

Defensive priority

Assess Linux Bluetooth btintel DDC record length validation

Recommended defensive actions

  • Review Linux kernel versions for exposure
  • Validate DDC record lengths in Bluetooth btintel
  • Apply patches from Linux kernel stable branches
  • Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up
  • Review compensating controls for exposed systems while remediation is scheduled and verified
  • 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

Evidence notes

The Linux kernel has a vulnerability in Bluetooth btintel where DDC record lengths are not properly validated. This issue can cause problems with Intel_Write_DDC. Claude Mythos reported this issue. The vulnerability has been resolved in the Linux kernel. Linux system administrators and developers should assess exposure and apply patches. Evidence is limited to supplied source corpus and CVE record details.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-98819 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-98819

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

  • CVE-2026-98819 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-98819

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

Supplemental references

  • Bluetooth: btintel: validate DDC record lengths

    Unverified legacy reference

    URL: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/98xxx/CVE-2026-98819.json

    cve_program_cvelist_v5

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/7df748aa9f9ecab514e5989ed89c9ba35b6e5574

    Supplemental source

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/069031f569f1681f17e863f48c221a6091b47850

    Supplemental source

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/b0fce76873a5e6a6820354409b26693ac5f8b251

    Supplemental source

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/f3617369fbb30a4d2e54841ab8e92ca4fa211e56

    Supplemental source

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/c9c15d4d8956df8c564f7c210e4dc5b9b820d97a

    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.