In the Linux kernel, the following vulnerability has been resolved: drivers/base/memory: fix memory block reference leak in poison accounting… (CVE-2026-64182)
A memory block reference leak vulnerability in the Linux kernel's drivers/base/memory subsystem has been fixed. The issue involved functions memblk_nr_poison_inc() and memblk_nr_poison_sub() leaking device references by not dropping them after lookup. This could lead to resource exhaustion affecting system availability.
AI Analysis
Technical Summary
The vulnerability in the Linux kernel occurs in the drivers/base/memory code where memblk_nr_poison_inc() and memblk_nr_poison_sub() functions call find_memory_block_by_id() to acquire a reference to a memory block device. However, these functions fail to release the acquired reference after updating the nr_hwpoison counter, causing a memory block device reference leak. This leak can accumulate over time, potentially leading to resource exhaustion and impacting system stability.
Potential Impact
The vulnerability does not affect confidentiality or integrity but can cause availability issues due to leaking device references, which may lead to resource exhaustion in the kernel memory management subsystem. This could degrade system performance or cause crashes.
Mitigation Recommendations
A fix for this vulnerability has been implemented in the Linux kernel by ensuring that the device reference acquired during memory block lookup is properly dropped after use. Users should apply the official kernel updates that include this fix. Patch status is not explicitly stated in the provided data; therefore, check the vendor or Linux kernel advisories for the exact fixed versions and update accordingly.
In the Linux kernel, the following vulnerability has been resolved: drivers/base/memory: fix memory block reference leak in poison accounting… (CVE-2026-64182)
Description
A memory block reference leak vulnerability in the Linux kernel's drivers/base/memory subsystem has been fixed. The issue involved functions memblk_nr_poison_inc() and memblk_nr_poison_sub() leaking device references by not dropping them after lookup. This could lead to resource exhaustion affecting system availability.
CVSS v3.1
Score 5.5medium
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The vulnerability in the Linux kernel occurs in the drivers/base/memory code where memblk_nr_poison_inc() and memblk_nr_poison_sub() functions call find_memory_block_by_id() to acquire a reference to a memory block device. However, these functions fail to release the acquired reference after updating the nr_hwpoison counter, causing a memory block device reference leak. This leak can accumulate over time, potentially leading to resource exhaustion and impacting system stability.
Potential Impact
The vulnerability does not affect confidentiality or integrity but can cause availability issues due to leaking device references, which may lead to resource exhaustion in the kernel memory management subsystem. This could degrade system performance or cause crashes.
Mitigation Recommendations
A fix for this vulnerability has been implemented in the Linux kernel by ensuring that the device reference acquired during memory block lookup is properly dropped after use. Users should apply the official kernel updates that include this fix. Patch status is not explicitly stated in the provided data; therefore, check the vendor or Linux kernel advisories for the exact fixed versions and update accordingly.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-pmqf-jjx9-qv6f
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-64182"]
- Ecosystems
- []
- Database Specific Severity
- null
- Cvss Version
- null
Threat ID: 6a5d27a72a4a8d5989129dd3
Added to database: 07/19/2026, 19:38:15 UTC
Last enriched: 08/12/2026, 19:37:22 UTC
Last updated: 08/27/2026, 10:52:10 UTC
Views: 46
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