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CVE-2026-64558— s390/pkey: Check length in pkey_pckmo handler implementation

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pkey_pckmo handler实现中未检查目标缓冲区长度，可能导致生成的输出数据超出目标缓冲区。

CVSS 7.8 · High EPSS 0.18% · P6

Possible ATT&CK Techniques 1 AI

T1211 · Exploitation for Stealth

Affected Version Matrix 10

VendorProduct Version RangeStatus
Linux Linux 8fcc231ce3bea12b78bb94b280cdc03cff342435< 02028a24e26d85262ab9c8fc4344e1f3503007fc affected
8fcc231ce3bea12b78bb94b280cdc03cff342435< 433e5e70cdc1edf382d28d08a885b22e2b98b7da affected
8fcc231ce3bea12b78bb94b280cdc03cff342435< 614aa0491c7a190556c2345dddee0b6f5ed90989 affected
8fcc231ce3bea12b78bb94b280cdc03cff342435< 1ac287e2af9a9112fe271427ef45eceb26bce8b4 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-2026-64558

Vulnerability Information
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Vulnerability Title
s390/pkey: Check length in pkey_pckmo handler implementation
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: s390/pkey: Check length in pkey_pckmo handler implementation Explicitly check the length of the target buffer in the pkey_pckmo implementation of the key_to_protkey() handler function. The handler function fails, if the generated output data exceeds the length of the provided target buffer.
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pkey_pckmo handler实现中未检查目标缓冲区长度，可能导致生成的输出数据超出目标缓冲区。
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 ~ 02028a24e26d85262ab9c8fc4344e1f3503007fc -
Linux Linux 6.12 -

II. Public POCs for CVE-2026-64558

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III. Intelligence Information for CVE-2026-64558

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Patches & Fixes for CVE-2026-64558 (4)

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-2026-64559 7.8 HIGH s390/pkey: Check length in PKEY_VERIFYPROTK ioctl
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-2026-64558

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