Medium [CVE-2026-82677] Denial of Service via double free in Module Timer subsystem
This medium-severity Red Hat Linux advisory covers CVE-2026-82677 affecting Red Hat Hardened Images, Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 9.
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Summary
A vulnerability was determined in valkey-io valkey 9.1.0. Impacted is the function moduleTimerHandler of the file src/module.c of the component Module Timer Subsystem.
This manipulation causes double free. The attack can be initiated remotely.
The exploit has been publicly disclosed and may be utilized. Patch name: b349fe2821e3998534b1454c1b64a478daf8c6b7.
To fix this issue, it is recommended to deploy a patch. This flaw could lead to a denial of service.
Execution remains confined within the process runtime environment, mitigated by default SELinux policies and container isolation preventing host-level escalation. Red Hat severity: Moderate — CVSS 4.9 (CVSS:3.1/AV:N/AC:L/PR:H/UI:N/S:U/C:N/I:N/A:H).
Weakness: CWE-1341. Affected Red Hat products: Red Hat Hardened Images; Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 9.
Red Hat fixing advisory: RHSA-2026:61884.
Affected products named by the advisory: Red Hat package: valkey.
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 14 days ago·verify at source
- valkey-main-9.0.6-0.1.hum1
- RHSA-2026:61884
Official advisory · high-confidence parse· fetched 14 days ago·verify at source
Mitigation checklist
- Restrict access to high-privilege administrative users capable of executing module timer operations, or isolate the Valkey service using network firewalls and RBAC controls until fixed packages are installed.
Official advisory · high-confidence parse· fetched 14 days ago·verify at source
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