High 7.8Published Jul 29, 2026

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

Updated under an hour ago (Oct 27, 2026, 3:50 AM ET)

Does this affect you?

It affects Linux. Add what you run to find out whether that includes you.

No exploitation reported and no EPSS estimate yet.

Do this next

Start free and add your stack

Free account, 1 product

Every CVE for Linux

Exploited in the last 30 days

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.

CVSS: 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): CWE-122
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Received
Record last updated: Oct 19, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 8fcc231ce3bea12b78bb94b280cdc03cff342435 before 02028a24e26d85262ab9c8fc4344e1f3503007fc; from 8fcc231ce3bea12b78bb94b280cdc03cff342435 before 433e5e70cdc1edf382d28d08a885b22e2b98b7da; from 8fcc231ce3bea12b78bb94b280cdc03cff342435 before 614aa0491c7a190556c2345dddee0b6f5ed90989; 8fcc231ce3bea12b78bb94b280cdc03cff342435 builds before 1ac287e2af9a9112fe271427ef45eceb26bce8b4	CNA record

References

References

https://git.kernel.org/stable/c/02028a24e26d85262ab9c8fc4344e1f3503007fc
https://git.kernel.org/stable/c/433e5e70cdc1edf382d28d08a885b22e2b98b7da
https://git.kernel.org/stable/c/614aa0491c7a190556c2345dddee0b6f5ed90989
https://git.kernel.org/stable/c/1ac287e2af9a9112fe271427ef45eceb26bce8b4

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.