7.8

CVE-2026-63824: KEYS: fix overflow in keyctl_pkey_params_get_2()

Analyzed
AliasesUBUNTU-CVE-2026-63824DEBIAN-CVE-2026-63824
Published 19-07-2026Last modified 19-10-2026

Vulnerability summary

CVE-2026-63824 is a high (CVSS 7.8) Out-of-bounds Write vulnerability in linux. EPSS estimates a 0.17% chance of exploitation in the next 30 days, higher than 6.2% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 7.8, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
7.8/10
010
High · v3.1 (CVE.org)
EPSS score
0.17%
0%100%
Low · +0.04 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 40 · Related 37
MGASA-2026-0312OPENSUSE-SU-2026:11339-1OPENSUSE-SU-2026:21555-1RHSA-2026:63128RHSA-2026:63129SUSE-SU-2026:23066-1

Timeline

  1. 19-07-2026
    PublishedVulnerability first disclosed.
  2. 19-10-2026
    Last modifiedVulnerability information updated.

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.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.17%

Chance of exploitation in the next 30 days

Percentile

6%

Versus all other CVEs

30-day change

Increase +0.04 pp

From 0.13% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu165 products
  • linuxAll versions (No fix recorded) | < 5.15.0-198.208 | < 6.8.0-147.147 | < 7.0.0-31.31
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 5.15.0-1117.124 | < 6.8.0-1067.70 | < 7.0.0-1012.12
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ 00d60fd3b93219ea854220f0fd264b86398cbc53, < 622ec2dcd59f21623f2a7ab773c80ceb7d555e3a | ≥ 00d60fd3b93219ea854220f0fd264b86398cbc53, < b1e247338bc71826a2d2def3e0874c34749df69a | ≥ 00d60fd3b93219ea854220f0fd264b86398cbc53, < 0f3058d7d26f81df9b68a18ddbe164bdc3c5eff3 | ≥ 00d60fd3b93219ea854220f0fd264b86398cbc53, < 5966e4e2ba213ab7ad559166152eb4f1f170dd2c | ≥ 00d60fd3b93219ea854220f0fd264b86398cbc53, < 5165f1cc727f1322456735df212d8e26ec237a8d | ≥ 00d60fd3b93219ea854220f0fd264b86398cbc53, < b11c1fa32667692a2c0566e10163758e786e430c | ≥ 00d60fd3b93219ea854220f0fd264b86398cbc53, < 670fc6a311ed321522b7fff92cf0fc376b4f6e78 | ≥ 00d60fd3b93219ea854220f0fd264b86398cbc53, < cb481e59ea6cae3b7796ac1d7a22b6b24c3f3c0b | 4.20
  • linux_kernel≥ 4.20, < 5.10.260 | ≥ 5.11, < 5.15.211 | ≥ 5.16, < 6.1.177 | ≥ 6.2, < 6.6.144 | ≥ 6.7, < 6.12.95 | ≥ 6.13, < 6.18.38 | ≥ 6.19, < 7.1.3
Debian1 product
  • linux< 6.1.177-1 | < 6.12.95-1 | < 7.1.3-1

3 vendors · 168 products

References

32 links
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