PT-2026-64359 · Linux · Linux

CVE-2026-64244 · Published 2026-07-24 · Updated 2026-07-24

NVD

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.

Related Identifiers

CVE-2026-64244

Affected Products

Linux

References · 7

• https://nvd.nist.gov/vuln/detail/CVE-2026-64244 · Security Note
• https://git.kernel.org/stable/c/a2b8d7827f48ee54a686cb80e4a1d0ff954ec42a · Note
• https://git.kernel.org/stable/c/bc3dd82a0ffd488bb902f4c69c3d28fd4088d973 · Note
• https://git.kernel.org/stable/c/059ac6252a63edf1cea79bf30bd860a8c264b62c · Note
• https://git.kernel.org/stable/c/22dc0d042f02ce82aa61422ea5f232628bfd9e9c · Note
• https://git.kernel.org/stable/c/6c25bf4e44a2b6a14332f952bba0974521f5b72d · Note
• https://git.kernel.org/stable/c/802e113cf120df7208e4c7e604950a85e87120a8 · Note