CVE-2022-48991 Vulnerability Details

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CVE-2022-48991 Metadata Quick Info

CVE Published: 21/10/2024 | CVE Updated: 04/11/2024 | CVE Year: 2022
Source: Linux | Vendor: Linux | Product: Linux
Status : PUBLISHED

CVE-2022-48991 Description

In the Linux kernel, the following vulnerability has been resolved: mm/khugepaged: invoke MMU notifiers in shmem/file collapse paths Any codepath that zaps page table entries must invoke MMU notifiers to ensure that secondary MMUs (like KVM) don\'t keep accessing pages which aren\'t mapped anymore. Secondary MMUs don\'t hold their own references to pages that are mirrored over, so failing to notify them can lead to page use-after-free. I\'m marking this as addressing an issue introduced in commit f3f0e1d2150b ("khugepaged: add support of collapse for tmpfs/shmem pages"), but most of the security impact of this only came in commit 27e1f8273113 ("khugepaged: enable collapse pmd for pte-mapped THP"), which actually omitted flushes for the removal of present PTEs, not just for the removal of empty page tables.

Metrics

CVSS Version: 3.1 | Base Score: n/a
Vector: n/a

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Weakness Enumeration (CWE)

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Source: Linux

Common Attack Pattern Enumeration and Classification (CAPEC)

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Source: NVD (National Vulnerability Database).