CVE-2026-64302 Vulnerability Analysis & Exploit Details

CVE-2026-64302
Vulnerability Scoring

5.5
/10
Significant Risk

Security assessments indicate that CVE-2026-64302 presents a notable risk, potentially requiring prompt mitigation.

Attack Complexity Details

  • Attack Complexity: Low
    Exploits can be performed without significant complexity or special conditions.
  • Attack Vector: Local
    Vulnerability requires local system access.
  • Privileges Required: Low
    Some privileges are necessary to exploit the vulnerability.
  • Scope: Unchanged
    Exploit remains within the originally vulnerable component.
  • User Interaction: None
    No user interaction is necessary for exploitation.

CVE-2026-64302 Details

Status: Analyzed

Last updated: 🕓 03 Sep 2026, 16:11 UTC
Originally published on: 🕙 25 Jul 2026, 10:17 UTC

Time between publication and last update: 40 days

CVSS Release: version 3

CVSS3 Source

nvd@nist.gov

CVSS3 Type

Primary

CVSS3 Vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVE-2026-64302 Vulnerability Summary

CVE-2026-64302: In the Linux kernel, the following vulnerability has been resolved: x86/mm: Fix freeing of PMD-sized vmemmap pages Commit bf9e4e30f353 ("x86/mm: use pagetable_free()"), switched from freeing non-boot page tables through __free_pages() to pagetable_free(). However, the function is also called to free vmemmap pages. Given that vmemmap pages are not page tables, already the page_ptdesc(page) is wrong. But worse, pagetable_free() calls: __free_pages(page, compound_order(page)); Since vmemmap pages are not compound pages (see vmemmap_alloc_block()) -- except for HVO, which doesn't apply here -- only first page of a PMD-sized vmemmap page is freed, leaking the other ones. Fix it by properly decoupling pagetable and vmemmap freeing. free_pagetable() no longer has to mess with SECTION_INFO, as only the vmemmap is marked like that in register_page_bootmem_memmap(). The indentation in remove_pmd_table() is messed up. Fix that while touching it. Bootmem info handling will soon be fixed up. For now, handle it similar to free_pagetable(), just avoiding the ifdef. [ dhansen: changelog munging. More imperative voice ]

Assessing the Risk of CVE-2026-64302

Access Complexity Graph

The exploitability of CVE-2026-64302 depends on two key factors: attack complexity (the level of effort required to execute an exploit) and privileges required (the access level an attacker needs).

Exploitability Analysis for CVE-2026-64302

CVE-2026-64302 presents an accessible attack vector with minimal effort required. Restricting access controls and implementing security updates are critical to reducing exploitation risks.

Understanding AC and PR

A lower complexity and fewer privilege requirements make exploitation easier. Security teams should evaluate these aspects to determine the urgency of mitigation strategies, such as patch management and access control policies.

Attack Complexity (AC) measures the difficulty in executing an exploit. A high AC means that specific conditions must be met, making an attack more challenging, while a low AC means the vulnerability can be exploited with minimal effort.

Privileges Required (PR) determine the level of system access necessary for an attack. Vulnerabilities requiring no privileges are more accessible to attackers, whereas high privilege requirements limit exploitation to authorized users with elevated access.

CVSS Score Breakdown Chart

Above is the CVSS Sub-score Breakdown for CVE-2026-64302, illustrating how Base, Impact, and Exploitability factors combine to form the overall severity rating. A higher sub-score typically indicates a more severe or easier-to-exploit vulnerability.

CIA Impact Analysis

Below is the Impact Analysis for CVE-2026-64302, showing how Confidentiality, Integrity, and Availability might be affected if the vulnerability is exploited. Higher values usually signal greater potential damage.

  • Confidentiality: None
    CVE-2026-64302 has no significant impact on data confidentiality.
  • Integrity: None
    CVE-2026-64302 poses no threat to data integrity.
  • Availability: High
    CVE-2026-64302 can disrupt system operations, potentially causing complete denial of service (DoS).

CVE-2026-64302 References

External References

CWE Common Weakness Enumeration

NVD-CWE-noinfo

Vulnerable Configurations

  • cpe:2.3:o:linux:linux_kernel:6.18.7:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.18.7:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.18.8:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.18.8:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.18.9:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.18.9:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.18.10:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.18.10:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.18.11:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.18.11:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.18.13:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.18.13:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.18.14:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.18.14:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.18.16:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.18.16:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.18.17:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.18.17:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.18.18:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.18.18:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.18.19:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.18.19:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.18.20:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.18.20:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.18.21:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.18.21:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.18.22:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.18.22:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.18.23:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.18.23:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.18.24:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.18.24:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.18.25:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.18.25:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.18.26:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.18.26:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.18.27:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.18.27:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.18.28:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.18.28:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.18.29:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.18.29:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.18.30:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.18.30:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.18.31:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.18.31:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.18.32:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.18.32:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.18.33:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.18.33:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.18.34:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.18.34:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.18.35:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.18.35:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.18.36:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.18.36:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.18.37:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.18.37:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.18.38:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.18.38:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.19:-:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.19:-:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.19.1:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.19.1:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.19.3:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.19.3:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.19.4:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.19.4:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.19.6:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.19.6:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.19.7:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.19.7:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.19.8:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.19.8:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.19.9:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.19.9:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.19.10:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.19.10:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.19.11:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.19.11:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.19.12:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.19.12:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.19.13:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.19.13:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.19.14:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.19.14:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.19:rc1:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.19:rc1:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.19:rc2:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.19:rc2:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.19:rc3:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.19:rc3:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.19:rc4:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.19:rc4:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.19:rc5:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.19:rc5:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.19:rc6:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.19:rc6:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.19:rc7:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.19:rc7:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:6.19:rc8:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:6.19:rc8:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:7.0:-:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:7.0:-:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:7.0.1:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:7.0.1:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:7.0.2:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:7.0.2:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:7.0.3:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:7.0.3:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:7.0.4:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:7.0.4:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:7.0.5:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:7.0.5:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:7.0.6:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:7.0.6:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:7.0.7:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:7.0.7:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:7.0.8:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:7.0.8:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:7.0.9:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:7.0.9:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:7.0.10:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:7.0.10:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:7.0.11:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:7.0.11:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:7.0.12:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:7.0.12:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:7.0.13:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:7.0.13:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:7.0.14:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:7.0.14:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:7.0:rc5:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:7.0:rc5:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:7.0:rc6:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:7.0:rc6:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:7.0:rc7:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:7.0:rc7:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:7.1:-:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:7.1:-:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:7.1.1:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:7.1.1:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:7.1.2:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:7.1.2:*:*:*:*:*:*:*
  • cpe:2.3:o:linux:linux_kernel:7.1.3:*:*:*:*:*:*:*
    cpe:2.3:o:linux:linux_kernel:7.1.3:*:*:*:*:*:*:*

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