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CVE-2026-46298 Linux CVE debrief

A vulnerability in the Linux kernel's pseries/papr-hvpipe has been identified, which could lead to a deadlock when an interrupt fires on the same CPU while executing the ->ioctl handler or ->release handler. This is due to a race condition that can occur when the interrupt handler is executed concurrently with the handlers. To address this issue, a patch has been applied to take spin_lock_irq{save|restore} versions of the lock, preventing the deadlock.

Vendor
Linux
Product
Unknown
CVSS
MEDIUM 4.7
CISA KEV
Not listed in stored evidence
Original CVE published
2026-06-08
Original CVE updated
2026-07-23
Advisory published
2026-06-08
Advisory updated
2026-07-23

Who should care

Linux kernel users and administrators, particularly those using the pseries/papr-hvpipe, should be aware of this vulnerability and apply the necessary patches to prevent potential deadlocks.

Technical summary

The Linux kernel's pseries/papr-hvpipe is vulnerable to a race condition that can lead to a deadlock. The vulnerability is caused by the ->ioctl handler and ->release handler not properly handling interrupts on the same CPU. To fix this issue, the patch takes spin_lock_irq{save|restore} versions of the lock.

Defensive priority

medium

Recommended defensive actions

  • Apply the patch that takes spin_lock_irq{save|restore} versions of the lock to prevent the deadlock.
  • Review and update Linux kernel configurations to ensure the pseries/papr-hvpipe is properly secured.

Evidence notes

The CVE record and NVD detail provide information on the vulnerability, and source references are available for further review.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-46298 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-46298

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

  • CVE-2026-46298 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-46298

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

Supplemental references

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/342c966f81cfc3cb6c297e80b37a9f3a5d637d2c

    416baaa9-dc9f-4396-8d5f-8c081fb06d67

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/7a4f0846ee6cc8cf44ae0046ed42e3259d1dd45b

    416baaa9-dc9f-4396-8d5f-8c081fb06d67

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.