Medium [CVE-2026-74632] fix huge_zero_pfn race
This medium-severity Red Hat Linux advisory covers CVE-2026-74632 affecting Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9.
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Summary
A flaw was found in the Linux kernel's memory management (mm/huge_memory). A race condition can occur between a memory shrinker and a concurrent page fault when handling huge zero pages.
This race can lead to the `huge_zero_pfn` being incorrectly set, causing the huge zero page to be misidentified as an ordinary Transparent Huge Page (THP) folio. Consequently, the huge zero page may be incorrectly split or otherwise mishandled, potentially leading to system instability or unexpected memory behavior.
Red Hat severity: Moderate — CVSS 5.5 (CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H). Weakness: CWE-367.
Affected Red Hat products: Red Hat Enterprise Linux 10; Red Hat Enterprise Linux 8; Red Hat Enterprise Linux 9. Red Hat does not currently list a fixing RHSA for this CVE.
Affected products named by the advisory: Red Hat package: kernel-rt.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative — check it before change work.
Official advisory · medium-confidence parse· fetched 1 hour ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists — confirm against the vendor advisory.
Official advisory · medium-confidence parse· fetched 1 hour ago·verify at source
Mitigation
The source record does not include mitigation steps. That is not a statement that no fix exists — read the vendor advisory below for the authoritative guidance.
Official advisory · medium-confidence parse· fetched 1 hour ago·verify at source
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