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CVE-2026-64559— s390/pkey: Check length in PKEY_VERIFYPROTK ioctl

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基金会开源的一款操作系统内核。 Linux kernel 6.12版本存在安全漏洞，该漏洞源于未检查PKEY_VERIFYPROTK ioctl中用户空间提供的缓冲区长度，可能导致缓冲区溢出。

CVSS 7.8 · High EPSS 0.12% · P2

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 10

VendorProduct Version RangeStatus
Linux Linux 8fcc231ce3bea12b78bb94b280cdc03cff342435< 0a9e34ccbe772b8f321388cdbdf4f22b94e513e7 affected
8fcc231ce3bea12b78bb94b280cdc03cff342435< 693bf91d4db134f9b1c2840c8e287eee3d993bac affected
8fcc231ce3bea12b78bb94b280cdc03cff342435< 7e7e03848c918aa0acad5ffd75d929e3afec1554 affected
8fcc231ce3bea12b78bb94b280cdc03cff342435< b3d4ab2d7df9426f7f1d3671d7e2108f2ca6e970 affected
6.12 affected
< 6.12 unaffected
6.12.97≤ 6.12.* unaffected
6.18.40≤ 6.18.* unaffected
… +2 more rows
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I. Basic Information for CVE-2026-64559

Vulnerability Information
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Vulnerability Title
s390/pkey: Check length in PKEY_VERIFYPROTK ioctl
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: s390/pkey: Check length in PKEY_VERIFYPROTK ioctl Explicitly check the buffer length request structure provided by user-space and fail, if it exceeds the buffer size.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/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基金会开源的一款操作系统内核。 Linux kernel 6.12版本存在安全漏洞，该漏洞源于未检查PKEY_VERIFYPROTK ioctl中用户空间提供的缓冲区长度，可能导致缓冲区溢出。
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 8fcc231ce3bea12b78bb94b280cdc03cff342435 ~ 0a9e34ccbe772b8f321388cdbdf4f22b94e513e7 -
Linux Linux 6.12 -

II. Public POCs for CVE-2026-64559

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III. Intelligence Information for CVE-2026-64559

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Patches & Fixes for CVE-2026-64559 (2)

Same Patch Batch · Linux · 2026-07-29 · 5 CVEs total

CVE-2026-64557 8.8 HIGH Bluetooth: L2CAP: Fix use-after-free in l2cap_sock_new_connection_cb()
CVE-2026-64556 7.8 HIGH perf/core: Detach event groups during remove_on_exec
CVE-2026-64558 7.8 HIGH s390/pkey: Check length in pkey_pckmo handler implementation
CVE-2026-64560 7.8 HIGH posix-cpu-timers: Prevent UAF caused by non-leader exec() race

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-64559

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