8.4

CVE-2026-64520: linux

CVSS: 8.4v3.1HighReceived
AliasesUBUNTU-CVE-2026-64520DEBIAN-CVE-2026-64520
Published 25-07-2026Last modified 05-08-2026
Open JSON

Vulnerability summary

CVE-2026-64520 is a high (CVSS 8.4) vulnerability in linux. EPSS estimates a 0.13% chance of exploitation in the next 30 days, higher than 2.3% of scored vulnerabilities.

Overall risk
34/100
0100
Medium · default modelHow is this calculated?
CVSS score
8.4/10
010
High · v3.1 (CVE.org)
EPSS score
0.13%
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 6 · Related 6
USN-8618-1USN-8622-1USN-8623-1USN-8728-1USN-8728-2USN-8728-3

Timeline

  1. 25-07-2026
    PublishedVulnerability first disclosed.
  2. 05-08-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: firmware: arm_ffa: Bound PARTITION_INFO_GET_REGS copies The register-based PARTITION_INFO_GET path trusted the firmware-provided indices when copying partition descriptors into the caller buffer. Reject inconsistent counts or index progressions so the copy loop cannot write past the allocated array. (fixed cur_idx when exactly one descriptor in the first fragment)

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.13%

Chance of exploitation in the next 30 days

Percentile

2%

Versus all other CVEs

30-day change

0.00 pp

From 0.13% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.13%

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

Ubuntu117 products
  • linux< 7.0.0-28.28
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-aws< 7.0.0-1009.9
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Debian1 product
  • linuxAll versions (No fix recorded) | < 7.0.12-1
Linux1 product
  • linux≥ ba85c644ac8dc37d9b01a3332c2f142cb4d46954, < f39bc7ebe75e2186b417a024a7f7e2fd4cc7eb95 | ≥ ba85c644ac8dc37d9b01a3332c2f142cb4d46954, < 79d95c02ae0a95e6e80e8e92b7ca74ecee02854f | ≥ ba85c644ac8dc37d9b01a3332c2f142cb4d46954, < 3974ea1938406f9bfa7c1f48d4e43533f447bb08 | 6.12

3 vendors · 119 products

References

13 links
Show all 13 references