5.5

CVE-2026-64353: bpf: Keep dynamic inner array lookups nullable

Analyzed
AliasesUBUNTU-CVE-2026-64353DEBIAN-CVE-2026-64353
Published 25-07-2026Last modified 17-08-2026

Vulnerability summary

CVE-2026-64353 is a medium (CVSS 5.5) vulnerability in linux. EPSS estimates a 0.16% chance of exploitation in the next 30 days, higher than 5.2% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 5.5, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
5.5/10
010
Medium · v3.1 (NVD)
EPSS score
0.16%
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 14 · Related 12
MGASA-2026-0336MGASA-2026-0337OPENSUSE-SU-2026:11476-1USN-8726-1USN-8726-2USN-8726-3

Timeline

  1. 25-07-2026
    PublishedVulnerability first disclosed.
  2. 17-08-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: bpf: Keep dynamic inner array lookups nullable An ARRAY_OF_MAPS can use an array created with BPF_F_INNER_MAP as its inner map template. A concrete inner array with a different max_entries value can then replace the template. After a successful outer map lookup, the verifier represents the resulting map pointer using the inner map template. Const-key lookup nullness elision consequently uses the template max_entries even though the runtime helper uses the concrete inner map max_entries. Do not elide lookup result nullness for maps marked with BPF_F_INNER_MAP, because the template max_entries does not prove that the key is in bounds for the concrete runtime map.

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.16%

Chance of exploitation in the next 30 days

Percentile

5%

Versus all other CVEs

30-day change

Increase +0.04 pp

From 0.12% 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

No weakness data has been published for this record.

Affected systems

Version check

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

Ubuntu119 products
  • linux< 7.0.0-31.31
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-aws< 7.0.0-1012.12
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ d2102f2f5d75a84dbab6ff890359f0bd4a18ca22, < 0b92ad64d6e4bde85e6b9888404f9a7a2b65d269 | ≥ d2102f2f5d75a84dbab6ff890359f0bd4a18ca22, < d57db0d975053e01410c54e708a85b6d32ef2ebd | ≥ d2102f2f5d75a84dbab6ff890359f0bd4a18ca22, < 53040a81ae57cdca8af8ac36fe4e661730cf7c6b | 6.14
  • linux_kernel≥ 6.14, < 6.18.40 | ≥ 6.19, < 7.1.4
Debian1 product
  • linux< 7.1.4-1

3 vendors · 122 products

References

18 links
Show all 18 references