CVE-2026-64559— s390/pkey: Check length in PKEY_VERIFYPROTK ioctl
Possible ATT&CK Techniques 1AI
T1068 · Exploitation for Privilege EscalationAffected Version Matrix 10
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| 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
II. Public POCs for CVE-2026-64559
| # | POC Description | Source Link | Shenlong Link |
|---|
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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-2026-64560 | 7.8 HIGH | posix-cpu-timers: Prevent UAF caused by non-leader exec() race |
| CVE-2026-64558 | 7.8 HIGH | s390/pkey: Check length in pkey_pckmo handler implementation |
| CVE-2026-64556 | 7.8 HIGH | perf/core: Detach event groups during remove_on_exec |
IV. Related Vulnerabilities
Same product: Linux
- CVE-2022-4994
KVM: x86: wean fast IN from emulator_pio_in - CVE-2026-64560
posix-cpu-timers: Prevent UAF caused by non-leader exec() ra - CVE-2026-64558
s390/pkey: Check length in pkey_pckmo handler implementation - CVE-2026-64556
perf/core: Detach event groups during remove_on_exec - CVE-2026-64557
Bluetooth: L2CAP: Fix use-after-free in l2cap_sock_new_conne
Same vendor: Linux
- CVE-2022-4994
KVM: x86: wean fast IN from emulator_pio_in - CVE-2026-64560
posix-cpu-timers: Prevent UAF caused by non-leader exec() ra - CVE-2026-64558
s390/pkey: Check length in pkey_pckmo handler implementation - CVE-2026-64556
perf/core: Detach event groups during remove_on_exec - CVE-2026-64557
Bluetooth: L2CAP: Fix use-after-free in l2cap_sock_new_conne
V. Comments for CVE-2026-64559
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