CVE-2026-63824

KEYS: fix overflow in keyctl_pkey_params_get_2()

State: Published
Severity: 7.8 High
Published: Jul 19, 2026
Updated: Oct 19, 2026
Reserved: Jul 19, 2026

Description

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.

Scores

CVSS	Score	Vector	Source
3.1	7.8 High	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H	Linux

Weaknesses

CWE-787 Out-of-bounds Write

Affected Products

Product	Versions
LinuxLinux	00d60fd3b93219ea854220f0fd264b86398cbc53 to before 622ec2dcd59f21623f2a7ab773c80ceb7d555e3aAffected 00d60fd3b93219ea854220f0fd264b86398cbc53 to before b1e247338bc71826a2d2def3e0874c34749df69aAffected 00d60fd3b93219ea854220f0fd264b86398cbc53 to before 0f3058d7d26f81df9b68a18ddbe164bdc3c5eff3Affected 00d60fd3b93219ea854220f0fd264b86398cbc53 to before 5966e4e2ba213ab7ad559166152eb4f1f170dd2cAffected 00d60fd3b93219ea854220f0fd264b86398cbc53 to before 5165f1cc727f1322456735df212d8e26ec237a8dAffected 00d60fd3b93219ea854220f0fd264b86398cbc53 to before b11c1fa32667692a2c0566e10163758e786e430cAffected 00d60fd3b93219ea854220f0fd264b86398cbc53 to before 670fc6a311ed321522b7fff92cf0fc376b4f6e78Affected 00d60fd3b93219ea854220f0fd264b86398cbc53 to before cb481e59ea6cae3b7796ac1d7a22b6b24c3f3c0bAffected
LinuxLinux	4.20Affected before 4.20Not affected 5.10.260 through 5.10.Not affected 5.15.211 through 5.15.Not affected 6.1.177 through 6.1.Not affected 6.6.144 through 6.6.Not affected 6.12.95 through 6.12.Not affected 6.18.38 through 6.18.Not affected 7.1.3 through 7.1.*Not affected 7.2 and laterNot affected

Product

Versions

LinuxLinux

00d60fd3b93219ea854220f0fd264b86398cbc53 to before 622ec2dcd59f21623f2a7ab773c80ceb7d555e3aAffected
00d60fd3b93219ea854220f0fd264b86398cbc53 to before b1e247338bc71826a2d2def3e0874c34749df69aAffected
00d60fd3b93219ea854220f0fd264b86398cbc53 to before 0f3058d7d26f81df9b68a18ddbe164bdc3c5eff3Affected
00d60fd3b93219ea854220f0fd264b86398cbc53 to before 5966e4e2ba213ab7ad559166152eb4f1f170dd2cAffected
00d60fd3b93219ea854220f0fd264b86398cbc53 to before 5165f1cc727f1322456735df212d8e26ec237a8dAffected
00d60fd3b93219ea854220f0fd264b86398cbc53 to before b11c1fa32667692a2c0566e10163758e786e430cAffected
00d60fd3b93219ea854220f0fd264b86398cbc53 to before 670fc6a311ed321522b7fff92cf0fc376b4f6e78Affected
00d60fd3b93219ea854220f0fd264b86398cbc53 to before cb481e59ea6cae3b7796ac1d7a22b6b24c3f3c0bAffected

LinuxLinux

4.20Affected
before 4.20Not affected
5.10.260 through 5.10.*Not affected
5.15.211 through 5.15.*Not affected
6.1.177 through 6.1.*Not affected
6.6.144 through 6.6.*Not affected
6.12.95 through 6.12.*Not affected
6.18.38 through 6.18.*Not affected
7.1.3 through 7.1.*Not affected
7.2 and laterNot affected

References

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