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CVE-2025-37996— KVM: arm64: Fix uninitialized memcache pointer in user_mem_abort()

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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user_mem_abort中的memcache指针未初始化。

CVSS 8.8 · High EPSS 0.16% · P5

Affected Version Matrix 6

VendorProduct Version RangeStatus
Linux Linux fce886a6020734d6253c2c5a3bc285e385cc5496< a26d50f8a4a5049e956984797b5d0dedea4bbb18 affected
fce886a6020734d6253c2c5a3bc285e385cc5496< 157dbc4a321f5bb6f8b6c724d12ba720a90f1a7c affected
6.14 affected
< 6.14 unaffected
6.14.7≤ 6.14.* unaffected
6.15≤ * unaffected
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I. Basic Information for CVE-2025-37996

Vulnerability Information
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Vulnerability Title
KVM: arm64: Fix uninitialized memcache pointer in user_mem_abort()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: KVM: arm64: Fix uninitialized memcache pointer in user_mem_abort() Commit fce886a60207 ("KVM: arm64: Plumb the pKVM MMU in KVM") made the initialization of the local memcache variable in user_mem_abort() conditional, leaving a codepath where it is used uninitialized via kvm_pgtable_stage2_map(). This can fail on any path that requires a stage-2 allocation without transition via a permission fault or dirty logging. Fix this by making sure that memcache is always valid.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:C/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
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user_mem_abort中的memcache指针未初始化。
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

Vendor Product Affected Versions CPE Subscribe
Linux Linux fce886a6020734d6253c2c5a3bc285e385cc5496 ~ a26d50f8a4a5049e956984797b5d0dedea4bbb18 -
Linux Linux 6.14 -

II. Public POCs for CVE-2025-37996

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III. Intelligence Information for CVE-2025-37996

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Same Patch Batch · Linux · 2025-05-29 · 7 CVEs total

CVE-2025-37998 7.8 HIGH openvswitch: Fix unsafe attribute parsing in output_userspace()
CVE-2025-37997 7.8 HIGH netfilter: ipset: fix region locking in hash types
CVE-2025-37999 fs/erofs/fileio: call erofs_onlinefolio_split() after bio_add_folio()
CVE-2025-37995 module: ensure that kobject_put() is safe for module type kobjects
CVE-2025-37994 usb: typec: ucsi: displayport: Fix NULL pointer access
CVE-2025-37993 can: m_can: m_can_class_allocate_dev(): initialize spin lock on device probe

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-37996

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