CVE-2026-64514
Vulnerability Scoring
Analysis In Progress
CVE-2026-64514 Vulnerability Analysis & Exploit Details
CVE-2026-64514
Attack Complexity Details
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Attack Complexity:
Attack Complexity Analysis In Progress
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Attack Vector:
Attack Vector Under Analysis
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Privileges Required:
None
No authentication is required for exploitation.
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Scope:
Impact is confined to the initially vulnerable component.
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User Interaction:
None
No user interaction is necessary for exploitation.
CVE-2026-64514 Details
Status: Received on 25 Jul 2026, 10:17 UTC
Published on: 25 Jul 2026, 10:17 UTC
CVSS Release:
CVE-2026-64514 Vulnerability Summary
CVE-2026-64514: In the Linux kernel, the following vulnerability has been resolved: userfaultfd: gate must_wait writability check on pte_present() userfaultfd_must_wait() and userfaultfd_huge_must_wait() read the PTE without taking the page table lock and then apply pte_write() / huge_pte_write() to it. Those accessors decode bits from the present encoding only; on a swap or migration entry they read the offset bits that happen to share the same position and return an undefined result. The intent of the check is "is this fault still WP-blocked?". A non-marker swap entry means the page is in transit -- the userfault context the original fault delivered against is no longer the same, and the swap-in or migration completion path will re-deliver a fresh fault if userspace still needs to handle it. Worst case under the current code the garbage write bit says "wait", and the thread stays asleep until a UFFDIO_WAKE that may never arrive. Gate the writability check on pte_present() so the lockless re-check only inspects present-PTE bits when the entry is actually present. The non-present, non-marker case returns "don't wait" and lets the fault path retry.
Assessing the Risk of CVE-2026-64514
Access Complexity Graph
The exploitability of CVE-2026-64514 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-2026-64514
No exploitability data is available for CVE-2026-64514.
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-2026-64514, 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-2026-64514, showing how Confidentiality, Integrity, and Availability might be affected if the vulnerability is exploited. Higher values usually signal greater potential damage.
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Confidentiality:
None
CVE-2026-64514 does not compromise confidentiality.
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Integrity:
None
CVE-2026-64514 does not impact data integrity.
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Availability:
None
CVE-2026-64514 does not affect system availability.
CVE-2026-64514 References
External References
- https://git.kernel.org/stable/c/29e6f952c5fb7dc1d6b90fe5b7f36063d44ddae0
- https://git.kernel.org/stable/c/5f4dbdb0a87596214076b20b94f2b71b522170b3
- https://git.kernel.org/stable/c/60d696a037eeeedfb57756dfe7ec08a1587c8631
- https://git.kernel.org/stable/c/710183888174639a15fcec16cd1af766b8480bb7
- https://git.kernel.org/stable/c/8e80af52db652fbc41320eee45a4f73bc029faf2
- https://git.kernel.org/stable/c/a5700a4c1c9099ac2ac73fe8a09cf059972e0d2f
- https://git.kernel.org/stable/c/a6e9a4939e359599701b1da351e84f72e021443a
- https://git.kernel.org/stable/c/d4026417e8184d13850a0bad4d96ceb6ed9f7152
CWE Common Weakness Enumeration
Unknown
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