Availability degradation via uninitialized folio split state
Published Sep 3, 2026 · Updated Sep 3, 2026
Improper initialization in Linux kernel 6.15 through 7.1.8 allows local users to degrade availability during memory reclaim. During __folio_split(), mm/huge_memory.c leaves xa_state.xa_lru unset, so xas_try_split() creates a charged page-cache xa_node absent from the mapping's shadow_nodes list. Later list_lru reclaim reaches the inconsistent node and triggers VM_WARN_ON; panic_on_warn converts that warning into a kernel panic when enabled.
Summary
What happened
Improper initialization in Linux kernel 6.15 through 7.1.8 allows local users to degrade availability during memory reclaim. During __folio_split(), mm/huge_memory.c leaves xa_state.xa_lru unset, so xas_try_split() creates a charged page-cache xa_node absent from the mapping's shadow_nodes list. Later list_lru reclaim reaches the inconsistent node and triggers VM_WARN_ON; panic_on_warn converts that warning into a kernel panic when enabled.
The record
- CVE
- CVE-2026-80729
- Published
- Sep 3, 2026
- Updated
- Sep 3, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux
- Classifications
- CWE-665, T1499
- Attack vector
- local
- Privileges
- authenticated
Timeline
How it unfolded
- Sep 3, 2026CVE publishedPublication date reported by the CVE source.
- Sep 3, 2026Record updatedLatest update available in the CVE record.
Exploitability
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Is a vulnerable build present?
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- Affected versionversion=58729c04cf1092b87aeef0bf0998c9e2e4771133 <aca1f2d5de17e138bc6c4859126b77e516b82541
- Affected versionversion=58729c04cf1092b87aeef0bf0998c9e2e4771133 <d858f7c9fc514f1d9d3be7d00b2dd4e2f2383b55
- Affected versionversion=6.15
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Published CVSS scores
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Attacks
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Technologies
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Your stack
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