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CVE-2026-63824

KEYS: fix overflow in keyctl_pkey_params_get_2()

HIGH
7.8
CVSS Score
Published: July 19, 2026 at 12:02 PM UTC
Updated: October 22, 2026 at 06:22 PM UTC
1 product affected across 1 vendorLinux Kernel

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Severity
HIGH7.8
Exploit prediction
EPSS 0.2%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Linux Kernel· Linux
95%
4.20 ≤ v < 5.10.2605.11 ≤ v < 5.15.2115.16 ≤ v < 6.1.1776.13 ≤ v < 6.18.386.19 ≤ v < 7.1.36.2 ≤ v < 6.6.1446.7 ≤ v < 6.12.950d60fd3b93219ea854220f0fd264b86398cbc534.20
Vendor states this is fixed in 0f3058d7d26f81df9b68a18ddbe164bdc3c5eff3 (fixed)
Vendor states this is fixed in 5165f1cc727f1322456735df212d8e26ec237a8d (fixed)
Vendor states this is fixed in 5966e4e2ba213ab7ad559166152eb4f1f170dd2c (fixed)
Vendor states this is fixed in 622ec2dcd59f21623f2a7ab773c80ceb7d555e3a (fixed)
Vendor states this is fixed in 670fc6a311ed321522b7fff92cf0fc376b4f6e78 (fixed)
Vendor states this is fixed in b11c1fa32667692a2c0566e10163758e786e430c (fixed)
Vendor states this is fixed in b1e247338bc71826a2d2def3e0874c34749df69a (fixed)
Vendor states this is fixed in cb481e59ea6cae3b7796ac1d7a22b6b24c3f3c0b (fixed)
Vendor states this is fixed in 4.20 (unaffected)
Vendor states this is fixed in 5.10.260 (unaffected)
Vendor states this is fixed in 5.15.211 (unaffected)
Vendor states this is fixed in 6.1.177 (unaffected)
Vendor states this is fixed in 6.12.95 (unaffected)
Vendor states this is fixed in 6.18.38 (unaffected)
Vendor states this is fixed in 6.6.144 (unaffected)
Vendor states this is fixed in 7.1.3 (unaffected)
Vendor states this is fixed in 7.2 (unaffected)

References (8)

Patch
Source: cverecord
https://git.kernel.org/stable/c/622ec2dcd59f21623f2a7ab773c80ceb7d555e3a
Patch
Source: cverecord
https://git.kernel.org/stable/c/b1e247338bc71826a2d2def3e0874c34749df69a
Patch
Source: cverecord
https://git.kernel.org/stable/c/0f3058d7d26f81df9b68a18ddbe164bdc3c5eff3
Patch
Source: cverecord
https://git.kernel.org/stable/c/5966e4e2ba213ab7ad559166152eb4f1f170dd2c
Patch
Source: cverecord
https://git.kernel.org/stable/c/5165f1cc727f1322456735df212d8e26ec237a8d
Patch
Source: cverecord
https://git.kernel.org/stable/c/b11c1fa32667692a2c0566e10163758e786e430c
Patch
Source: cverecord
https://git.kernel.org/stable/c/670fc6a311ed321522b7fff92cf0fc376b4f6e78
Patch
Source: cverecord
https://git.kernel.org/stable/c/cb481e59ea6cae3b7796ac1d7a22b6b24c3f3c0b

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.8HIGHLinux
Vector?

Quick Info

StatusANALYZED
CWE
CWE-787

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