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CVE-2025-38257— s390/pkey: Prevent overflow in size calculation for memdup_user()

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s390 pkey驱动中memdup_user计算溢出，可能导致内存分配错误。

CVSS 7.3 · High EPSS 0.18% · P7

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 14

VendorProduct Version RangeStatus
Linux Linux f2bbc96e7cfad3891b7bf9bd3e566b9b7ab4553d< ad1bdd24a02d5a8d119af8e4cd50933780a6d29f affected
f2bbc96e7cfad3891b7bf9bd3e566b9b7ab4553d< faa1ab4a23c42e34dc000ef4977b751d94d5148c affected
f2bbc96e7cfad3891b7bf9bd3e566b9b7ab4553d< 88f3869649edbc4a13f6c2877091f81cd5a50f05 affected
f2bbc96e7cfad3891b7bf9bd3e566b9b7ab4553d< f855b119e62b004a5044ed565f2a2b368c4d3f16 affected
f2bbc96e7cfad3891b7bf9bd3e566b9b7ab4553d< 73483ca7e07a5e39bdf612eec9d3d293e8bef649 affected
f2bbc96e7cfad3891b7bf9bd3e566b9b7ab4553d< 7360ee47599af91a1d5f4e74d635d9408a54e489 affected
5.4 affected
< 5.4 unaffected
… +6 more rows
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I. Basic Information for CVE-2025-38257

Vulnerability Information
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Vulnerability Title
s390/pkey: Prevent overflow in size calculation for memdup_user()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: s390/pkey: Prevent overflow in size calculation for memdup_user() Number of apqn target list entries contained in 'nr_apqns' variable is determined by userspace via an ioctl call so the result of the product in calculation of size passed to memdup_user() may overflow. In this case the actual size of the allocated area and the value describing it won't be in sync leading to various types of unpredictable behaviour later. Use a proper memdup_array_user() helper which returns an error if an overflow is detected. Note that it is different from when nr_apqns is initially zero - that case is considered valid and should be handled in subsequent pkey_handler implementations. Found by Linux Verification Center (linuxtesting.org).
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:L/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s390 pkey驱动中memdup_user计算溢出，可能导致内存分配错误。
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 f2bbc96e7cfad3891b7bf9bd3e566b9b7ab4553d ~ ad1bdd24a02d5a8d119af8e4cd50933780a6d29f -
Linux Linux 5.4 -

II. Public POCs for CVE-2025-38257

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III. Intelligence Information for CVE-2025-38257

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Same Patch Batch · Linux · 2025-07-09 · 26 CVEs total

CVE-2025-38264 9.8 CRITICAL nvme-tcp: sanitize request list handling
CVE-2025-38246 9.8 CRITICAL bnxt: properly flush XDP redirect lists
CVE-2025-38253 8.8 HIGH HID: wacom: fix crash in wacom_aes_battery_handler()
CVE-2025-38238 8.8 HIGH scsi: fnic: Fix crash in fnic_wq_cmpl_handler when FDMI times out
CVE-2025-38252 7.8 HIGH cxl/ras: Fix CPER handler device confusion
CVE-2025-38261 7.8 HIGH riscv: save the SR_SUM status over switches
CVE-2025-38262 7.8 HIGH tty: serial: uartlite: register uart driver in init
CVE-2025-38250 7.8 HIGH Bluetooth: hci_core: Fix use-after-free in vhci_flush()
CVE-2025-38242 7.8 HIGH mm: userfaultfd: fix race of userfaultfd_move and swap cache
CVE-2025-38248 7.8 HIGH bridge: mcast: Fix use-after-free during router port configuration
CVE-2025-38244 7.5 HIGH smb: client: fix potential deadlock when reconnecting channels
CVE-2025-38239 7.3 HIGH scsi: megaraid_sas: Fix invalid node index
CVE-2025-38255 lib/group_cpus: fix NULL pointer dereference from group_cpus_evenly()
CVE-2025-38263 bcache: fix NULL pointer in cache_set_flush()
CVE-2025-38241 mm/shmem, swap: fix softlockup with mTHP swapin
CVE-2025-38260 btrfs: handle csum tree error with rescue=ibadroots correctly
CVE-2025-38259 ASoC: codecs: wcd9335: Fix missing free of regulator supplies
CVE-2025-38258 mm/damon/sysfs-schemes: free old damon_sysfs_scheme_filter->memcg_path on write
CVE-2025-38256 io_uring/rsrc: fix folio unpinning
CVE-2025-38254 drm/amd/display: Add sanity checks for drm_edid_raw()

Showing top 20 of 26 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-38257

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