Riskcovery

CVE-2026-97617

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

State
Published
Severity
Not scored
Published
Sep 25, 2026
Updated
Oct 19, 2026
Reserved
Sep 24, 2026

Read the record on cve.org

Description

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.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

ProductVersions
LinuxLinux
  • 117c39200d9d760cbd5944bb89efb7b9c51965aa to before f2099644e1b2a2c0805c5240d63ab0522d9d0174Affected
  • 117c39200d9d760cbd5944bb89efb7b9c51965aa to before 9fd4ea952e6ac12a63c3fe89f08ad02771aa2c06Affected
  • 117c39200d9d760cbd5944bb89efb7b9c51965aa to before 32bf47db9237c5b8b6f6aaa5356bb4c79d241f76Affected
  • 117c39200d9d760cbd5944bb89efb7b9c51965aa to before d860c67c051685abb0460b593b193f0f45f4fa92Affected
LinuxLinux
  • 6.10Affected
  • before 6.10Not affected
  • 6.12.111 through 6.12.*Not affected
  • 6.18.53 through 6.18.*Not affected
  • 7.2.7 through 7.2.*Not affected
  • 7.3 and laterNot affected

References

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