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A vulnerability in the Linux kernel related to the hugetlbfs subsystem was resolved by reverting a problematic patch that mishandled lock allocation during mmap_prepare. The issue could cause a lock leak if allocation failed after mmap_prepare was called. This vulnerability affects various Linux kernel versions prior to specific 7.0.0-xx releases. The vulnerability has a CVSS score of 5.5 with an impact on availability. A patch is available and included in updated Linux kernel packages for Ubuntu 26.04 LTS and related variants.

The vulnerability (CVE-2026-46318) in the Linux kernel's hugetlbfs subsystem was introduced by a patch that updated hugetlbfs to use mmap_prepare. This patch incorrectly handled the allocation of the hugetlb VMA lock during mmap_prepare, potentially causing a lock leak if allocation failed after mmap_prepare was called. The fix involved reverting the problematic patch to allow a proper rework of the implementation. The vulnerability affects multiple Linux kernel versions prior to 7.0.0-28.28 and related builds. The issue does not risk merge conflicts causing similar problems due to VMA_DONTEXPAND_BIT being set for hugetlb mappings. The vulnerability has a CVSS 3.1 score of 5.5 (AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H), indicating a local attacker with low privileges could cause an availability impact. The vendor advisory confirms a patch is available and recommends updating to fixed package versions.

Detailed information about UBUNTU-CVE-2026-46318 affecting null linux-hwe-edge. Get real-time updates, technical details, and mitigation strategies.

UBUNTU-CVE-2026-46318 - Live Threat Intelligence - Threat Radar | OffSeq.com

Linux hwe edge: In the Linux kernel, the following vulnerability has been resolved: Revert "mm/hugetlbfs: update hugetlbfs to use mmap_prepare" This reverts commit… (CVE-2026-46318)

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