CVE-2026-93216: Linux

Описание

Оригинално описание

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.

Засегнати продукти

• Linux Linux: fcf8935832b86d3437f00e732c6d0d4d2819d6a9 преди e7c1923c5f30a6953f0540e3171d882ec17b05d3; fcf8935832b86d3437f00e732c6d0d4d2819d6a9 преди a4c940ab3f794f221a338c9431ad1ce0d73a2bea; fcf8935832b86d3437f00e732c6d0d4d2819d6a9 преди 46761406e14381dc35f498c247a87565b87ea2ef; fcf8935832b86d3437f00e732c6d0d4d2819d6a9 преди 90f095b816e25c6a9e4446d299bac5007fdcb3df
• Linux Linux: 5.18; преди 5.18; 6.6.160 до 6.6.*; 6.12.114 до 6.12.*; 7.2.4 до 7.2.*; 7.3 до *

История

Други уязвимости в Linux Linux

• 8.1CVE-2026-99270
• 7.8CVE-2026-99269
• CVE-2026-99268
• CVE-2026-99266
• CVE-2026-99267

Първоизточници

• https://www.cve.org/CVERecord?id=CVE-2026-93216
• https://nvd.nist.gov/vuln/detail/CVE-2026-93216
• https://git.kernel.org/stable/c/e7c1923c5f30a6953f0540e3171d882ec17b05d3
• https://git.kernel.org/stable/c/a4c940ab3f794f221a338c9431ad1ce0d73a2bea
• https://git.kernel.org/stable/c/46761406e14381dc35f498c247a87565b87ea2ef
• https://git.kernel.org/stable/c/90f095b816e25c6a9e4446d299bac5007fdcb3df