Answer in brief
CVE-2026-64244 records a Medium severity (CVSS 5.5) vulnerability in drivers/base/memory: set mem->altmap after successful device registration. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 5.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=1a8c64e110435e44e71bcd50a75663174b575f22 <802e113cf120df7208e4c7e604950a85e87120a8 || >=1a8c64e110435e44e71bcd50a75663174b575f22 <22dc0d042f02ce82aa61422ea5f232628bfd9e9c || >=1a8c64e110435e44e71bcd50a75663174b575f22 <6c25bf4e44a2b6a14332f952bba0974521f5b72d || >=1a8c64e110435e44e71bcd50a75663174b575f22 <bc3dd82a0ffd488bb902f4c69c3d28fd4088d973 || >=1a8c64e110435e44e71bcd50a75663174b575f22 <059ac6252a63edf1cea79bf30bd860a8c264b62c || >=1a8c64e110435e44e71bcd50a75663174b575f22 <a2b8d7827f48ee54a686cb80e4a1d0ff954ec42a | 802e113cf120df7208e4c7e604950a85e87120a8, 22dc0d042f02ce82aa61422ea5f232628bfd9e9c, 6c25bf4e44a2b6a14332f952bba0974521f5b72d, bc3dd82a0ffd488bb902f4c69c3d28fd4088d973, 059ac6252a63edf1cea79bf30bd860a8c264b62c, a2b8d7827f48ee54a686cb80e4a1d0ff954ec42a |
| Linux/Linuxgeneric | 6.6 | Not reported |
Published upstream
Jul 24, 2026
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Aug 17, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 17, 2026
In the Linux kernel, the following vulnerability has been resolved: drivers/base/memory: set mem->altmap after successful device registration If __add_memory_block() fails at xa_store() (under memory pressure for example), device_unregister() is called, which eventually triggers memory_block_release() with mem->altmap still set, causing a WARN_ON(mem->altmap). This was triggered by modifying virtio-mem driver. Fix this by delaying the assignment of mem->altmap until after __add_memory_block() has succeeded.
Quoted source text, attributed separately from HOL analysis.