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CVE-2025-37958— mm/huge_memory: fix dereferencing invalid pmd migration entry

EPSS 0.12% · P30

Affected Version Matrix 18

VendorProductVersion RangeStatus
LinuxLinux84c3fc4e9c563d8fb91cfdf5948da48fe1af34d3< 753f142f7ff7d2223a47105b61e1efd91587d711affected
84c3fc4e9c563d8fb91cfdf5948da48fe1af34d3< 9468afbda3fbfcec21ac8132364dff3dab945fafaffected
84c3fc4e9c563d8fb91cfdf5948da48fe1af34d3< ef5706bed97e240b4abf4233ceb03da7336bc775affected
84c3fc4e9c563d8fb91cfdf5948da48fe1af34d3< 22f6368768340260e862f35151d2e1c55cb1dc75affected
84c3fc4e9c563d8fb91cfdf5948da48fe1af34d3< 3977946f61cdba87b6b5aaf7d7094e96089583a5affected
84c3fc4e9c563d8fb91cfdf5948da48fe1af34d3< 6166c3cf405441f7147b322980144feb3cefc617affected
84c3fc4e9c563d8fb91cfdf5948da48fe1af34d3< fbab262b0c8226c697af1851a424896ed47dedccaffected
84c3fc4e9c563d8fb91cfdf5948da48fe1af34d3< be6e843fc51a584672dfd9c4a6a24c8cb81d5fb7affected
… +10 more rows
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I. Basic Information for CVE-2025-37958

Vulnerability Information
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Vulnerability Title
mm/huge_memory: fix dereferencing invalid pmd migration entry
Source: NVD (National Vulnerability Database)
Vulnerability Description
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: <TASK> 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.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于未正确检查PMD迁移条目，可能导致无效地址访问。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
LinuxLinux 84c3fc4e9c563d8fb91cfdf5948da48fe1af34d3 ~ 753f142f7ff7d2223a47105b61e1efd91587d711 -
LinuxLinux 4.14 -

II. Public POCs for CVE-2025-37958

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III. Intelligence Information for CVE-2025-37958

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Same Patch Batch · Linux · 2025-05-20 · 95 CVEs total

CVE-2025-379249.8 CRITICALksmbd: fix use-after-free in kerberos authentication
CVE-2025-37957KVM: SVM: Forcibly leave SMM mode on SHUTDOWN interception
CVE-2025-37955virtio-net: free xsk_buffs on error in virtnet_xsk_pool_enable()
CVE-2025-37952ksmbd: Fix UAF in __close_file_table_ids
CVE-2025-37948arm64: bpf: Add BHB mitigation to the epilogue for cBPF programs
CVE-2025-37947ksmbd: prevent out-of-bounds stream writes by validating *pos
CVE-2025-37946s390/pci: Fix duplicate pci_dev_put() in disable_slot() when PF has child VFs
CVE-2025-37945net: phy: allow MDIO bus PM ops to start/stop state machine for phylink-controlled PHY
CVE-2025-37944wifi: ath12k: Fix invalid entry fetch in ath12k_dp_mon_srng_process
CVE-2025-37949xenbus: Use kref to track req lifetime
CVE-2025-37956ksmbd: prevent rename with empty string
CVE-2025-37954smb: client: Avoid race in open_cached_dir with lease breaks
CVE-2025-37960memblock: Accept allocated memory before use in memblock_double_array()
CVE-2025-37959bpf: Scrub packet on bpf_redirect_peer
CVE-2025-37961ipvs: fix uninit-value for saddr in do_output_route4
CVE-2025-37963arm64: bpf: Only mitigate cBPF programs loaded by unprivileged users
CVE-2025-37962ksmbd: fix memory leak in parse_lease_state()
CVE-2025-37964x86/mm: Eliminate window where TLB flushes may be inadvertently skipped
CVE-2025-37965drm/amd/display: Fix invalid context error in dml helper
CVE-2025-37967usb: typec: ucsi: displayport: Fix deadlock

Showing top 20 of 95 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

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Same vendor: Linux

V. Comments for CVE-2025-37958

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