CVE-2026-93216
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.
Affected versions
Linux kernel versions
5.18
and later are affected. Fixed in
7.2.4,
7.3-rc1
and their respective stable series.
References
2 totalFrequently asked questions
-
What is CVE-2026-93216?
CVE-2026-93216 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 5.18 onward and has been patched in 7.2.4 and 7.3-rc1. CVE-2026-93216 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
-
Is there a patch available for CVE-2026-93216?
Yes. CVE-2026-93216 has been patched. Fixed versions include 7.2.4 and 7.3-rc1. If you are running Linux kernel 5.18 or later up to the fix versions, apply the relevant patch for your kernel branch.
-
Is CVE-2026-93216 actively exploited?
No. CVE-2026-93216 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.