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Review reviewHigh

CVE-2026-63824

Linux

In the Linux kernel, the following vulnerability has been resolved: KEYS: fix overflow in keyctl_pkey_params_get_2() The length for the internal output buffer is calculated incorrectly, which can result overflow when a too small buffer is provided. Fix the bug by allocating internal output with the size of the maximum length of the cryptographic primitive instead of caller provided size.

CVSS
7.8
EPSS
-
- percentile
CISA KEV
Not listed
Published
2026.07.19
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: KEYS: fix overflow in keyctl_pkey_params_get_2() The length for the internal output buffer is calculated incorrectly, which can result overflow when a too small buffer is provided. Fix the bug by allocating internal output with the size of the maximum length of the cryptographic primitive instead of caller provided size.

Affected product and versions

Product
Linux
Affected versions
>= 00d60fd3b93219ea854220f0fd264b86398cbc53 < 622ec2dcd59f21623f2a7ab773c80ceb7d555e3a, >= 00d60fd3b93219ea854220f0fd264b86398cbc53 < b1e247338bc71826a2d2def3e0874c34749df69a, >= 00d60fd3b93219ea854220f0fd264b86398cbc53 < 0f3058d7d26f81df9b68a18ddbe164bdc3c5eff3, >= 00d60fd3b93219ea854220f0fd264b86398cbc53 < 5966e4e2ba213ab7ad559166152eb4f1f170dd2c, >= 00d60fd3b93219ea854220f0fd264b86398cbc53 < 5165f1cc727f1322456735df212d8e26ec237a8d, >= 00d60fd3b93219ea854220f0fd264b86398cbc53 < b11c1fa32667692a2c0566e10163758e786e430c, >= 00d60fd3b93219ea854220f0fd264b86398cbc53 < 670fc6a311ed321522b7fff92cf0fc376b4f6e78, >= 00d60fd3b93219ea854220f0fd264b86398cbc53 < cb481e59ea6cae3b7796ac1d7a22b6b24c3f3c0b, >= 4.20
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