CVE-2026-31786
Vulnerability Scoring
Analysis In Progress
CVE-2026-31786 Vulnerability Analysis & Exploit Details
CVE-2026-31786
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-2026-31786 Details
Status: Received on 30 Apr 2026, 11:16 UTC
Published on: 30 Apr 2026, 11:16 UTC
CVSS Release:
CVE-2026-31786 Vulnerability Summary
CVE-2026-31786: In the Linux kernel, the following vulnerability has been resolved: Buffer overflow in drivers/xen/sys-hypervisor.c The build id returned by HYPERVISOR_xen_version(XENVER_build_id) is neither NUL terminated nor a string. The first causes a buffer overflow as sprintf in buildid_show will read and copy till it finds a NUL. 00000000 f4 91 51 f4 dd 38 9e 9d 65 47 52 eb 10 71 db 50 |..Q..8..eGR..q.P| 00000010 b9 a8 01 42 6f 2e 32 |...Bo.2| 00000017 So use a memcpy instead of sprintf to have the correct value: 00000000 f4 91 51 f4 dd 00 9e 9d 65 47 52 eb 10 71 db 50 |..Q.....eGR..q.P| 00000010 b9 a8 01 42 |...B| 00000014 (the above have a hack to embed a zero inside and check it's returned correctly). This is XSA-485 / CVE-2026-31786
Assessing the Risk of CVE-2026-31786
Access Complexity Graph
The exploitability of CVE-2026-31786 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-2026-31786
No exploitability data is available for CVE-2026-31786.
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-2026-31786, 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-2026-31786, 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-2026-31786 does not compromise confidentiality.
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Integrity:
None
CVE-2026-31786 does not impact data integrity.
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Availability:
None
CVE-2026-31786 does not affect system availability.
CVE-2026-31786 References
External References
- https://git.kernel.org/stable/c/4b4defd2fce3f966c25adabf46644a85558f1169
- https://git.kernel.org/stable/c/52cecff98bda2c51eed1c6ce9d21c5d6268fb19d
- https://git.kernel.org/stable/c/5c5ff7c7bd15bb536f44b10b3fb5b8408f344d0a
- https://git.kernel.org/stable/c/8288d031a01dbacfde3fc643f7be3d23504de64d
- https://git.kernel.org/stable/c/d5f59216650c51e5e3fcb7517c825bc8047f60ef
- https://git.kernel.org/stable/c/e3af585e1728c917682b6a3de9a69b41fb9194d4
- https://git.kernel.org/stable/c/f458ba102da97fafca106327086fc95f3fc764cb
- http://www.openwall.com/lists/oss-security/2026/04/28/12
- http://xenbits.xen.org/xsa/advisory-485.html
CWE Common Weakness Enumeration
Unknown
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