hugetlbfs: release subpool on fill_super failure

Summary

In the Linux kernel, the following vulnerability has been resolved: hugetlbfs: release subpool on fill_super failure hugetlbfs_fill_super() allocates a hugepage subpool when size or min_size mount options are specified. hugepage_new_subpool() may also reserve huge pages for min_size. If root dentry creation fails after the subpool is created, the failure path frees the subpool with kfree(). This bypasses hugepage_put_subpool() and can leave min_size reservations charged. Use hugepage_put_subpool() on the failure path, matching the normal put_super path.

Timeline

1. Sep 17, 2026, 4:08 PM UTCCVE published
2. Oct 19, 2026, 9:01 AM UTCRecord last updated

Affected versions

• Linux Linux

  From 7ca02d0ae586fe7df59632966a64f3f1a756ef05 · fixed in f2d6cea221d777fab3ba18f805ba4c17c90e0b8b; From 7ca02d0ae586fe7df59632966a64f3f1a756ef05 · fixed in 91c4f3a87862fd86594d5945512decbfa0b1d13d; From 7ca02d0ae586fe7df59632966a64f3f1a756ef05 · fixed in 04f0354a4abf6793aa5b3f32e2b019ab206f344d; From 7ca02d0ae586fe7df59632966a64f3f1a756ef05 · fixed in 5b7fc7a1ce2a5f2cd8ed80a883157c7108074e0b; From 7ca02d0ae586fe7df59632966a64f3f1a756ef05 · fixed in 1d8be4ee81e73fcc52e58f47842d9a2277cfeaaa; From 7ca02d0ae586fe7df59632966a64f3f1a756ef05 · fixed in dfe848cadfde4179a0691da34f4bed36ff7185b5; From 7ca02d0ae586fe7df59632966a64f3f1a756ef05 · fixed in dc2bd517ac0bce4ec7498644bd16b6db502df8e2; From 7ca02d0ae586fe7df59632966a64f3f1a756ef05 · fixed in 308ab73e97c87bd0e142b11758faab7f88d82854

• Linux Linux

  4.1

• KernelLinux

  From 4.1.0 · fixed in 5.10.270; From 5.11.0 · fixed in 5.15.221; From 5.16.0 · fixed in 6.1.188; From 6.2.0 · fixed in 6.6.157; From 6.7.0 · fixed in 6.12.110; From 6.13.0 · fixed in 6.18.52; From 6.19.0 · fixed in 7.2.6

References 8