AZL-103538
See a problem?- Import Source
- https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-103538.json
- JSON Data
- https://api.osv.dev/v1/vulns/AZL-103538
- Upstream
- Published
- 2026-09-24T16:17:16Z
- Modified
- 2026-09-27T05:34:32Z
- Summary
- CVE-2026-93216 affecting package kernel 6.6.157.1-1
- Details
-
In the Linux kernel, the following vulnerability has been resolved:
mm/page_owner: use memcg_data snapshot to avoid TOCTOU in print_page_owner_memcg()
print_page_owner_memcg() reads page->memcg_data via READ_ONCE() at the start to guard against tail pages and NULL data. However, it later re-reads page->memcg_data locklessly in two places:
1: page_memcg_check(page)
2: PageMemcgKmem(page) (via folio_memcg_kmem(), which includes VM_BUG_ON assertions for tail pages and MEMCG_DATA_OBJEXTS)
If the page is concurrently freed and reallocated as a THP tail page or slab page between these calls, the VM_BUG_ON assertions can trigger on CONFIG_DEBUG_VM=y builds, crashing the kernel.
Fix both TOCTOU issues by using the memcg_data snapshot throughout.
- References