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In the Linux kernel, the following vulnerability has been resolved: mm/hugetlb: fix hugetlb cgroup rsvd charge/uncharge mismatch In… (CVE-2026-72213)

0
Unknown
Published: 08/15/2026 (08/15/2026, 06:32:16 UTC)
Source: GCVE Database

Description

In the Linux kernel, the following vulnerability has been resolved: mm/hugetlb: fix hugetlb cgroup rsvd charge/uncharge mismatch In alloc_hugetlb_folio(), a single h_cg pointer is used for both the rsvd and non-rsvd hugetlb cgroup charges. When map_chg is set, hugetlb_cgroup_charge_cgroup_rsvd() stores the charged cgroup in h_cg, but the immediately following hugetlb_cgroup_charge_cgroup() overwrites h_cg with the non-rsvd cgroup pointer. As a result, hugetlb_cgroup_commit_charge_rsvd() stores the wrong (non-rsvd) cgroup pointer into the folio's rsvd slot. When the folio is later freed, free_huge_folio() unconditionally calls both hugetlb_cgroup_uncharge_folio() and hugetlb_cgroup_uncharge_folio_rsvd(). The rsvd uncharge reads back the wrong cgroup from the folio and decrements a counter that was never charged for that cgroup, causing a page_counter underflow: page_counter underflow: -512 nr_pages=512 WARNING: mm/page_counter.c:61 at page_counter_cancel Fix this by introducing a separate h_cg_rsvd pointer exclusively for the rsvd charge path, keeping the rsvd and non-rsvd charges fully independent through their charge, commit, and error uncharge paths.

Technical Details

Gcve Source
db.gcve.eu
Osv Id
GHSA-cqhp-gwhx-vmwp
Osv Schema Version
1.4.0
Aliases
["CVE-2026-72213"]
Ecosystems
[]
Database Specific Severity
null
Cvss Version
null

Threat ID: 6a808b74bf8831d5394fe3e5

Added to database: 08/15/2026, 15:53:24 UTC

Last updated: 08/15/2026, 15:54:49 UTC

Views: 1

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