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.
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Amazon_linux_2023 | — | Upgrade kernel6.12-debuginfo-common-x86_64Upgrade kernel6.12-tools-develUpgrade perf6.12-debuginfoUpgrade kernel-livepatch-6.12.111-136.204Upgrade bpftool6.12-debuginfoUpgrade kernel6.12-toolsUpgrade kernel6.12-develUpgrade kernel6.12-tools-debuginfoUpgrade python3-perf6.12-debuginfoUpgrade python3-perf6.12Upgrade kernel6.12-debuginfoUpgrade kernel6.12-debuginfo-common-aarch64Upgrade bpftool6.12Upgrade kernel6.12-headersUpgrade kernel6.12-modules-extraUpgrade perf6.12Upgrade kernel6.12Upgrade kernel6.12-modules-extra-common | Oct 13, 2026 | Sep 25, 2026 |
| Debian | — | Upgrade linux-6.12Upgrade linux | Sep 30, 2026 | Sep 25, 2026 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | Oct 13, 2026 | Sep 25, 2026 |
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