OSV - Open Source Vulnerabilities

CVE-2025-37958

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Source
https://cve.org/CVERecord?id=CVE-2025-37958
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2025-37958.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2025-37958
Downstream
Related
Published
2025-05-20T16:01:51Z
Modified
2026-08-12T03:30:23Z
Summary
mm/huge_memory: fix dereferencing invalid pmd migration entry
Details

In the Linux kernel, the following vulnerability has been resolved:

mm/huge_memory: fix dereferencing invalid pmd migration entry

When migrating a THP, concurrent access to the PMD migration entry during a deferred split scan can lead to an invalid address access, as illustrated below. To prevent this invalid access, it is necessary to check the PMD migration entry and return early. In this context, there is no need to use pmd_to_swp_entry and pfn_swap_entry_to_page to verify the equality of the target folio. Since the PMD migration entry is locked, it cannot be served as the target.

Mailing list discussion and explanation from Hugh Dickins: "An anon_vma lookup points to a location which may contain the folio of interest, but might instead contain another folio: and weeding out those other folios is precisely what the "folio != pmd_folio((*pmd)" check (and the "risk of replacing the wrong folio" comment a few lines above it) is for."

BUG: unable to handle page fault for address: ffffea60001db008 CPU: 0 UID: 0 PID: 2199114 Comm: tee Not tainted 6.14.0+ #4 NONE Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-debian-1.16.3-2 04/01/2014 RIP: 0010:split_huge_pmd_locked+0x3b5/0x2b60 Call Trace: try_to_migrate_one+0x28c/0x3730 rmap_walk_anon+0x4f6/0x770 unmap_folio+0x196/0x1f0 split_huge_page_to_list_to_order+0x9f6/0x1560 deferred_split_scan+0xac5/0x12a0 shrinker_debugfs_scan_write+0x376/0x470 full_proxy_write+0x15c/0x220 vfs_write+0x2fc/0xcb0 ksys_write+0x146/0x250 do_syscall_64+0x6a/0x120 entry_SYSCALL_64_after_hwframe+0x76/0x7e

The bug is found by syzkaller on an internal kernel, then confirmed on upstream.

Database specific 
{
    "cna_assigner":  "Linux",
    "osv_generated_from":  "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/37xxx/CVE-2025-37958.json"
}
References

Affected packages

Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

Affected ranges

Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
84c3fc4e9c563d8fb91cfdf5948da48fe1af34d3
Fixed
753f142f7ff7d2223a47105b61e1efd91587d711
Fixed
9468afbda3fbfcec21ac8132364dff3dab945faf
Fixed
ef5706bed97e240b4abf4233ceb03da7336bc775
Fixed
22f6368768340260e862f35151d2e1c55cb1dc75
Fixed
3977946f61cdba87b6b5aaf7d7094e96089583a5
Fixed
6166c3cf405441f7147b322980144feb3cefc617
Fixed
fbab262b0c8226c697af1851a424896ed47dedcc
Fixed
be6e843fc51a584672dfd9c4a6a24c8cb81d5fb7

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2025-37958.json"

Linux / Kernel

Package

Name
Kernel

Affected ranges

Type
ECOSYSTEM
Events
Introduced
4.14.0
Fixed
5.4.295
Type
ECOSYSTEM
Events
Introduced
5.5.0
Fixed
5.10.239
Type
ECOSYSTEM
Events
Introduced
5.11.0
Fixed
5.15.186
Type
ECOSYSTEM
Events
Introduced
5.16.0
Fixed
6.1.142
Type
ECOSYSTEM
Events
Introduced
6.2.0
Fixed
6.6.95
Type
ECOSYSTEM
Events
Introduced
6.7.0
Fixed
6.12.29
Type
ECOSYSTEM
Events
Introduced
6.13.0
Fixed
6.14.7

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2025-37958.json"