CVE-2026-53064: dm cache: fix null-deref with concurrent writes in passthrough mode
dm cache: fix null-deref with concurrent writes in passthrough mode
Affected Software
Remediation
Recommended actions to resolve this vulnerability, in priority order.
- Upgrade
Upgrade to a fixed release to a version that resolves this vulnerability.
Fixed in 6.6.143.1-1 - Upgrade
Upgrade
Linux kernelto a version that resolves this vulnerability.Fixed in 6.19.0-rc7 #3 PREEMPTPatch dm cache: fix null-deref with concurrent writes in passthrough mode - Configuration
When running dm-cache in passthrough mode, ensure the kernel fix is applied to prevent the NULL-ptr-deref in dm_cell_unlock_v2 that can be triggered by concurrent writes during cache invalidation.
Device Mapper cache (dm-cache) passthrough mode = enabled
Event History
Frequently Asked Questions
What is the severity of CVE-2026-53064?
CVE-2026-53064 has a risk rating of 21, indicating a significant security threat.
How do I fix CVE-2026-53064?
To fix CVE-2026-53064, update to the patched version of the Linux kernel that addresses this vulnerability.
What types of systems are affected by CVE-2026-53064?
CVE-2026-53064 affects systems using the Linux kernel, specifically those utilizing the dm cache in passthrough mode.
What is the impact of CVE-2026-53064 on system security?
CVE-2026-53064 poses a risk of null pointer dereference which could lead to system instability or crashes during concurrent write operations.
When was CVE-2026-53064 published?
CVE-2026-53064 was published on June 24, 2026.