SECUFOCUSNOW
Home›CVE index›CVE-2026-64559
Review reviewHigh

CVE-2026-64559

Linux

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.

CVSS
7.8
EPSS
-
- percentile
CISA KEV
Not listed
Published
2026.07.30
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability-
Technical severityCVSS 7.8

Vulnerability overview

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.

Affected product and versions

Product
Linux
Affected versions
>= 8fcc231ce3bea12b78bb94b280cdc03cff342435 < 0a9e34ccbe772b8f321388cdbdf4f22b94e513e7, >= 8fcc231ce3bea12b78bb94b280cdc03cff342435 < 693bf91d4db134f9b1c2840c8e287eee3d993bac, >= 8fcc231ce3bea12b78bb94b280cdc03cff342435 < 7e7e03848c918aa0acad5ffd75d929e3afec1554, >= 8fcc231ce3bea12b78bb94b280cdc03cff342435 < b3d4ab2d7df9426f7f1d3671d7e2108f2ca6e970, >= 6.12
Fixed versions
No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
Not available