7.8

CVE-2026-64558: linux

CVSS: 7.8v3.1HighReceived
AliasesUBUNTU-CVE-2026-64558DEBIAN-CVE-2026-64558
Published 29-07-2026Last modified 16-10-2026
Open JSON

Vulnerability summary

CVE-2026-64558 is a high (CVSS 7.8) vulnerability in linux. EPSS estimates a 0.12% chance of exploitation in the next 30 days, higher than 1.6% of scored vulnerabilities.

Overall risk
31/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.8/10
010
High · v3.1 (CVE.org)
EPSS score
0.12%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 17 · Related 14
MGASA-2026-0336MGASA-2026-0337OPENSUSE-SU-2026:11476-1OPENSUSE-SU-2026:21910-1RHSA-2026:74174SUSE-SU-2026:23881-1

Timeline

  1. 29-07-2026
    PublishedVulnerability first disclosed.
  2. 16-10-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: s390/pkey: Check length in pkey_pckmo handler implementation Explicitly check the length of the target buffer in the pkey_pckmo implementation of the key_to_protkey() handler function. The handler function fails, if the generated output data exceeds the length of the provided target buffer.

CVSS metrics

5 scores · 4 sources · 2 versions

EPSS trend

Probability

0.12%

Chance of exploitation in the next 30 days

Percentile

2%

Versus all other CVEs

30-day change

0.00 pp

From 0.12% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.12%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Ubuntu119 products
  • linux< 7.0.0-38.38
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-aws< 7.0.0-1014.14
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Debian2 products
  • linux< 6.12.100-1 | < 7.1.5-1
  • linux-6.12< 6.12.100-1~deb12u1
Linux1 product
  • linux≥ 8fcc231ce3bea12b78bb94b280cdc03cff342435, < 02028a24e26d85262ab9c8fc4344e1f3503007fc | ≥ 8fcc231ce3bea12b78bb94b280cdc03cff342435, < 433e5e70cdc1edf382d28d08a885b22e2b98b7da | ≥ 8fcc231ce3bea12b78bb94b280cdc03cff342435, < 614aa0491c7a190556c2345dddee0b6f5ed90989 | ≥ 8fcc231ce3bea12b78bb94b280cdc03cff342435, < 1ac287e2af9a9112fe271427ef45eceb26bce8b4 | 6.12

3 vendors · 122 products

References

14 links
Show all 14 references