CVE-2026-97617

Summary

In the Linux kernel, the following vulnerability has been resolved:

ring-buffer: Check resize_disabled before publishing the new subbuf order

ring_buffer_subbuf_order_set() stores the new order and only then walks the CPUs, returning -EBUSY if any of them has resizing disabled. A user mapped buffer has resizing disabled, and __rb_map_vma() reads buffer->subbuf_order without buffer->mutex, so an mmap of an already mapped CPU racing the failing order change sizes the mapping with the new order and inserts pages past the sub-buffer into the VMA.

Check the CPUs before storing the new order.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux117c39200d9d760cbd5944bb89efb7b9c51965aa < f2099644e1b2a2c0805c5240d63ab0522d9d0174affected
LinuxLinux117c39200d9d760cbd5944bb89efb7b9c51965aa < 9fd4ea952e6ac12a63c3fe89f08ad02771aa2c06affected
LinuxLinux117c39200d9d760cbd5944bb89efb7b9c51965aa < 32bf47db9237c5b8b6f6aaa5356bb4c79d241f76affected
LinuxLinux117c39200d9d760cbd5944bb89efb7b9c51965aa < d860c67c051685abb0460b593b193f0f45f4fa92affected
LinuxLinux6.10affected
LinuxLinux0 < 6.10unaffected
LinuxLinux6.12.111 <= 6.12.*unaffected
LinuxLinux6.18.53 <= 6.18.*unaffected
LinuxLinux7.2.7 <= 7.2.*unaffected
LinuxLinux7.3-rc3 <= *unaffected

Weaknesses

References