7.8
HIGH
CVSS 3.1
CVE-2026-63824
KEYS: fix overflow in keyctl_pkey_params_get_2()
Overview
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.
Details
INFO
Published Date :
July 19, 2026, 12:16 p.m.
Last Modified :
Oct. 22, 2026, 6:22 p.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Scoring
CVSS Scores
The Common Vulnerability Scoring System is a standardized framework
for assessing the severity of vulnerabilities in software and systems.
We collect and displays CVSS scores from various sources for each CVE.
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS | 134c704f-9b21-4f2e-91b3-4a467353bcc0 | |||||
| CVSS 3.1 | HIGH | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
Solution
Fix memory corruption by correctly allocating internal buffers.
- Apply the patch to fix keyctl_pkey_params_get_2() buffer overflow.
- Ensure internal buffer allocation uses maximum primitive length.
- Update the Linux kernel to the latest secure version.
References
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-63824.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-63824 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-63824
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-63824 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-63824 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Oct. 22, 2026
Action Type Old Value New Value Added CPE Configuration OR *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.16 up to (excluding) 6.1.177 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.2 up to (excluding) 6.6.144 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.7 up to (excluding) 6.12.95 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.11 up to (excluding) 5.15.211 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.13 up to (excluding) 6.18.38 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.19 up to (excluding) 7.1.3 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 4.20 up to (excluding) 5.10.260 Added Reference Type kernel.org: https://git.kernel.org/stable/c/0f3058d7d26f81df9b68a18ddbe164bdc3c5eff3 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/5165f1cc727f1322456735df212d8e26ec237a8d Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/5966e4e2ba213ab7ad559166152eb4f1f170dd2c Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/622ec2dcd59f21623f2a7ab773c80ceb7d555e3a Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/670fc6a311ed321522b7fff92cf0fc376b4f6e78 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/b11c1fa32667692a2c0566e10163758e786e430c Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/b1e247338bc71826a2d2def3e0874c34749df69a Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/cb481e59ea6cae3b7796ac1d7a22b6b24c3f3c0b Types: Patch -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Oct. 19, 2026
Action Type Old Value New Value Added CWE CWE-787 -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Oct. 16, 2026
Action Type Old Value New Value Added Reference https://git.kernel.org/stable/c/0f3058d7d26f81df9b68a18ddbe164bdc3c5eff3 Added Reference https://git.kernel.org/stable/c/5165f1cc727f1322456735df212d8e26ec237a8d Added Reference https://git.kernel.org/stable/c/5966e4e2ba213ab7ad559166152eb4f1f170dd2c Added Reference https://git.kernel.org/stable/c/622ec2dcd59f21623f2a7ab773c80ceb7d555e3a Added Reference https://git.kernel.org/stable/c/670fc6a311ed321522b7fff92cf0fc376b4f6e78 Added Reference https://git.kernel.org/stable/c/b11c1fa32667692a2c0566e10163758e786e430c Added Reference https://git.kernel.org/stable/c/b1e247338bc71826a2d2def3e0874c34749df69a Added Reference https://git.kernel.org/stable/c/cb481e59ea6cae3b7796ac1d7a22b6b24c3f3c0b Removed Reference https://git.kernel.org/stable/c/0f3058d7d26f81df9b68a18ddbe164bdc3c5eff3 Removed Reference https://git.kernel.org/stable/c/5165f1cc727f1322456735df212d8e26ec237a8d Removed Reference https://git.kernel.org/stable/c/5966e4e2ba213ab7ad559166152eb4f1f170dd2c Removed Reference https://git.kernel.org/stable/c/622ec2dcd59f21623f2a7ab773c80ceb7d555e3a Removed Reference https://git.kernel.org/stable/c/670fc6a311ed321522b7fff92cf0fc376b4f6e78 Removed Reference https://git.kernel.org/stable/c/b11c1fa32667692a2c0566e10163758e786e430c Removed Reference https://git.kernel.org/stable/c/b1e247338bc71826a2d2def3e0874c34749df69a Removed Reference https://git.kernel.org/stable/c/cb481e59ea6cae3b7796ac1d7a22b6b24c3f3c0b -
CVE Modified by 134c704f-9b21-4f2e-91b3-4a467353bcc0
Oct. 16, 2026
Action Type Old Value New Value Added SSVC {'id': 'CVE-2026-63824', 'role': 'CISA Coordinator', 'options': [{'exploitation': 'none'}, {'automatable': 'no'}, {'technicalImpact': 'total'}], 'version': '2.0.3', 'timestamp': '2026-10-16T15:31:12.388673Z'} -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Aug. 17, 2026
Action Type Old Value New Value Changed Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '00d60fd3b93219ea854220f0fd264b86398cbc53', 'lessThan': '622ec2dcd59f21623f2a7ab773c80ceb7d555e3a', 'versionType': 'git'}, {'status': 'affected', 'version': '00d60fd3b93219ea854220f0fd264b86398cbc53', 'lessThan': 'b1e247338bc71826a2d2def3e0874c34749df69a', 'versionType': 'git'}, {'status': 'affected', 'version': '00d60fd3b93219ea854220f0fd264b86398cbc53', 'lessThan': '0f3058d7d26f81df9b68a18ddbe164bdc3c5eff3', 'versionType': 'git'}, {'status': 'affected', 'version': '00d60fd3b93219ea854220f0fd264b86398cbc53', 'lessThan': '5966e4e2ba213ab7ad559166152eb4f1f170dd2c', 'versionType': 'git'}, {'status': 'affected', 'version': '00d60fd3b93219ea854220f0fd264b86398cbc53', 'lessThan': '5165f1cc727f1322456735df212d8e26ec237a8d', 'versionType': 'git'}, {'status': 'affected', 'version': '00d60fd3b93219ea854220f0fd264b86398cbc53', 'lessThan': 'b11c1fa32667692a2c0566e10163758e786e430c', 'versionType': 'git'}, {'status': 'affected', 'version': '00d60fd3b93219ea854220f0fd264b86398cbc53', 'lessThan': '670fc6a311ed321522b7fff92cf0fc376b4f6e78', 'versionType': 'git'}, {'status': 'affected', 'version': '00d60fd3b93219ea854220f0fd264b86398cbc53', 'lessThan': 'cb481e59ea6cae3b7796ac1d7a22b6b24c3f3c0b', 'versionType': 'git'}], 'programFiles': ['security/keys/keyctl_pkey.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '4.20'}, {'status': 'unaffected', 'version': '0', 'lessThan': '4.20', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '5.10.260', 'versionType': 'semver', 'lessThanOrEqual': '5.10.*'}, {'status': 'unaffected', 'version': '5.15.211', 'versionType': 'semver', 'lessThanOrEqual': '5.15.*'}, {'status': 'unaffected', 'version': '6.1.177', 'versionType': 'semver', 'lessThanOrEqual': '6.1.*'}, {'status': 'unaffected', 'version': '6.6.144', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.95', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.38', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.3', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc1', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['security/keys/keyctl_pkey.c'], 'defaultStatus': 'affected'}] [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '00d60fd3b93219ea854220f0fd264b86398cbc53', 'lessThan': '622ec2dcd59f21623f2a7ab773c80ceb7d555e3a', 'versionType': 'git'}, {'status': 'affected', 'version': '00d60fd3b93219ea854220f0fd264b86398cbc53', 'lessThan': 'b1e247338bc71826a2d2def3e0874c34749df69a', 'versionType': 'git'}, {'status': 'affected', 'version': '00d60fd3b93219ea854220f0fd264b86398cbc53', 'lessThan': '0f3058d7d26f81df9b68a18ddbe164bdc3c5eff3', 'versionType': 'git'}, {'status': 'affected', 'version': '00d60fd3b93219ea854220f0fd264b86398cbc53', 'lessThan': '5966e4e2ba213ab7ad559166152eb4f1f170dd2c', 'versionType': 'git'}, {'status': 'affected', 'version': '00d60fd3b93219ea854220f0fd264b86398cbc53', 'lessThan': '5165f1cc727f1322456735df212d8e26ec237a8d', 'versionType': 'git'}, {'status': 'affected', 'version': '00d60fd3b93219ea854220f0fd264b86398cbc53', 'lessThan': 'b11c1fa32667692a2c0566e10163758e786e430c', 'versionType': 'git'}, {'status': 'affected', 'version': '00d60fd3b93219ea854220f0fd264b86398cbc53', 'lessThan': '670fc6a311ed321522b7fff92cf0fc376b4f6e78', 'versionType': 'git'}, {'status': 'affected', 'version': '00d60fd3b93219ea854220f0fd264b86398cbc53', 'lessThan': 'cb481e59ea6cae3b7796ac1d7a22b6b24c3f3c0b', 'versionType': 'git'}], 'programFiles': ['security/keys/keyctl_pkey.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '4.20'}, {'status': 'unaffected', 'version': '0', 'lessThan': '4.20', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '5.10.260', 'versionType': 'semver', 'lessThanOrEqual': '5.10.*'}, {'status': 'unaffected', 'version': '5.15.211', 'versionType': 'semver', 'lessThanOrEqual': '5.15.*'}, {'status': 'unaffected', 'version': '6.1.177', 'versionType': 'semver', 'lessThanOrEqual': '6.1.*'}, {'status': 'unaffected', 'version': '6.6.144', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.95', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.38', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.3', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['security/keys/keyctl_pkey.c'], 'defaultStatus': 'affected'}] -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jul. 20, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H -
New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jul. 19, 2026
Action Type Old Value New Value Added Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '00d60fd3b93219ea854220f0fd264b86398cbc53', 'lessThan': '622ec2dcd59f21623f2a7ab773c80ceb7d555e3a', 'versionType': 'git'}, {'status': 'affected', 'version': '00d60fd3b93219ea854220f0fd264b86398cbc53', 'lessThan': 'b1e247338bc71826a2d2def3e0874c34749df69a', 'versionType': 'git'}, {'status': 'affected', 'version': '00d60fd3b93219ea854220f0fd264b86398cbc53', 'lessThan': '0f3058d7d26f81df9b68a18ddbe164bdc3c5eff3', 'versionType': 'git'}, {'status': 'affected', 'version': '00d60fd3b93219ea854220f0fd264b86398cbc53', 'lessThan': '5966e4e2ba213ab7ad559166152eb4f1f170dd2c', 'versionType': 'git'}, {'status': 'affected', 'version': '00d60fd3b93219ea854220f0fd264b86398cbc53', 'lessThan': '5165f1cc727f1322456735df212d8e26ec237a8d', 'versionType': 'git'}, {'status': 'affected', 'version': '00d60fd3b93219ea854220f0fd264b86398cbc53', 'lessThan': 'b11c1fa32667692a2c0566e10163758e786e430c', 'versionType': 'git'}, {'status': 'affected', 'version': '00d60fd3b93219ea854220f0fd264b86398cbc53', 'lessThan': '670fc6a311ed321522b7fff92cf0fc376b4f6e78', 'versionType': 'git'}, {'status': 'affected', 'version': '00d60fd3b93219ea854220f0fd264b86398cbc53', 'lessThan': 'cb481e59ea6cae3b7796ac1d7a22b6b24c3f3c0b', 'versionType': 'git'}], 'programFiles': ['security/keys/keyctl_pkey.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '4.20'}, {'status': 'unaffected', 'version': '0', 'lessThan': '4.20', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '5.10.260', 'versionType': 'semver', 'lessThanOrEqual': '5.10.*'}, {'status': 'unaffected', 'version': '5.15.211', 'versionType': 'semver', 'lessThanOrEqual': '5.15.*'}, {'status': 'unaffected', 'version': '6.1.177', 'versionType': 'semver', 'lessThanOrEqual': '6.1.*'}, {'status': 'unaffected', 'version': '6.6.144', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.95', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.38', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.3', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc1', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['security/keys/keyctl_pkey.c'], 'defaultStatus': 'affected'}] Added 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. Added Reference https://git.kernel.org/stable/c/0f3058d7d26f81df9b68a18ddbe164bdc3c5eff3 Added Reference https://git.kernel.org/stable/c/5165f1cc727f1322456735df212d8e26ec237a8d Added Reference https://git.kernel.org/stable/c/5966e4e2ba213ab7ad559166152eb4f1f170dd2c Added Reference https://git.kernel.org/stable/c/622ec2dcd59f21623f2a7ab773c80ceb7d555e3a Added Reference https://git.kernel.org/stable/c/670fc6a311ed321522b7fff92cf0fc376b4f6e78 Added Reference https://git.kernel.org/stable/c/b11c1fa32667692a2c0566e10163758e786e430c Added Reference https://git.kernel.org/stable/c/b1e247338bc71826a2d2def3e0874c34749df69a Added Reference https://git.kernel.org/stable/c/cb481e59ea6cae3b7796ac1d7a22b6b24c3f3c0b
EPSS is a daily estimate of the probability of exploitation activity
being observed over the next 30 days. Following chart shows the EPSS
score history of the vulnerability.