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PatchSiren cyber security CVE debrief

CVE-2026-64116 Linux CVE debrief

A vulnerability has been resolved in the Linux kernel, specifically in the ipv6_hop_ioam() function. The function accesses __in6_dev_get(skb->dev)->cnf.ioam6_enabled without validating the returned idev pointer, which can lead to a NULL pointer dereference during interface teardown. This vulnerability affects users of the Linux kernel who should be aware and take necessary precautions. The vulnerability has been assigned a CVE record, and users should review the official advisory for affected scope, severity, and vendor guidance.

Vendor
Linux
Product
Unknown
CVSS
Unknown
CISA KEV
Not listed in stored evidence
Original CVE published
2026-07-19
Original CVE updated
2026-07-19
Advisory published
2026-07-19
Advisory updated
2026-07-19

Who should care

Users of the Linux kernel, specifically those who manage and maintain Linux-based systems, should be aware of this vulnerability and take necessary precautions. This includes reviewing the official advisory, applying patches, and implementing additional defensive measures to prevent similar issues.

Technical summary

The ipv6_hop_ioam() function in the Linux kernel does not validate the idev pointer returned by __in6_dev_get(skb->dev) before accessing its members. This can cause a NULL pointer dereference when the interface is being torn down. A check has been added to mitigate this issue. The vulnerability has been resolved, and users should apply the patch to add a NULL check for idev in ipv6_hop_ioam(). This affects Linux kernel users who should review the official advisory for affected scope, severity, and vendor guidance, and take necessary precautions, including applying patches and implementing defensive measures to prevent similar issues.

Defensive priority

Medium

Recommended defensive actions

  • Apply the patch to add a NULL check for idev in ipv6_hop_ioam()
  • Monitor for updates from the Linux kernel maintainers
  • Consider implementing additional defensive measures to prevent similar issues
  • 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
  • Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The CVE record was published on 2026-07-19T16:17:53.103Z and has not been modified since then. The NVD entry is currently Received. There is limited information available about the vulnerability, and defenders should verify the affected scope and severity with the Linux kernel maintainers. The vulnerability was resolved in the Linux kernel, specifically in the ipv6_hop_ioam() function.

Official resources

AI-assisted PatchSiren debrief based on the supplied source corpus. The CVE record was published on 2026-07-19T16:17:53.103Z and has not been modified since then.