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Advisory severityHigh7.0Vendor: MediumRed Hat Linux

High [CVE-2026-64015] fix missed RCU read section on lookup

This high-severity Red Hat Linux advisory covers CVE-2026-64015 affecting Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9.

Aggregated and source-linked by VulniPulse. Data sources, validation and limitations.

CVE-2026-64015 Source published Source updated

VulniPulse record published Record updated

CVE-2026-64015
Affected products & platforms
Red Hat LinuxLinux Kernel
Open source advisory

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Summary

In the Linux kernel, the following vulnerability has been resolved: security/keys: fix missed RCU read section on lookup Nicholas Carlini reports that the keyring code calls assoc_array_find() in find_key_to_update() without holding the RCU read lock, while the assoc_array_gc() code really is designed around removing the node from the tree and then freeing it after an RCU grace-period.

The regular key handling doesn't see this because holding the keyring semaphore hides any lifetime issues, but the persistent key handling uses a different model. Instead of extending the keyring locking, just do the simple RCU locking that the assoc_array was designed for.

The `assoc_array_find()` function, used for looking up keys, was called without holding the necessary Read-Copy-Update (RCU) read lock. This oversight allows for a memory corruption vulnerability, particularly affecting persistent key handling, as the system's garbage collection mechanism can free memory while it is still in use.

This could lead to a denial of service. Red Hat severity: Moderate — CVSS 7 (CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H).

Weakness: CWE-825. Affected Red Hat products: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9; Red Hat Enterprise Linux 6; Red Hat Enterprise Linux 7.

Will not fix / out of support: Red Hat Enterprise Linux 6.

Affected versions

No affected-version range was extracted from the source record. The vendor advisory is authoritative. Check it before change work.

Official advisory · high-confidence parse· fetched 7 days ago·verify at source

Fixed versions
  • kernel-0:6.12.0-211.53.1.el10_2
  • kernel-rt-0:4.18.0-553.162.1.rt7.503.el8_10
  • kernel-0:4.18.0-553.162.1.el8_10
  • kernel-0:5.14.0-687.48.1.el9_8
  • RHSA-2026:65334
  • RHSA-2026:66324
  • RHSA-2026:66325
  • RHSA-2026:67470

Official advisory · high-confidence parse· fetched 7 days ago·verify at source

Mitigation

Upgrade to a fixed release: kernel-0:6.12.0-211.53.1.el10_2, kernel-rt-0:4.18.0-553.162.1.rt7.503.el8_10, kernel-0:4.18.0-553.162.1.el8_10, kernel-0:5.14.0-687.48.1.el9_8, RHSA-2026:65334, RHSA-2026:66324. That is the remediation for this advisory.

The vendor advisory may list interim mitigations or workarounds not captured here. Review it before change work.

Official advisory · high-confidence parse· fetched 7 days ago·verify at source

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