CVE-2022-49990
Vulnerability Scoring
Analysis In Progress
CVE-2022-49990 Vulnerability Analysis & Exploit Details
CVE-2022-49990
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-2022-49990 Details
Status: Awaiting Analysis
Published on: 18 Jun 2025, 11:15 UTC
CVSS Release:
CVE-2022-49990 Vulnerability Summary
CVE-2022-49990: In the Linux kernel, the following vulnerability has been resolved: s390: fix double free of GS and RI CBs on fork() failure The pointers for guarded storage and runtime instrumentation control blocks are stored in the thread_struct of the associated task. These pointers are initially copied on fork() via arch_dup_task_struct() and then cleared via copy_thread() before fork() returns. If fork() happens to fail after the initial task dup and before copy_thread(), the newly allocated task and associated thread_struct memory are freed via free_task() -> arch_release_task_struct(). This results in a double free of the guarded storage and runtime info structs because the fields in the failed task still refer to memory associated with the source task. This problem can manifest as a BUG_ON() in set_freepointer() (with CONFIG_SLAB_FREELIST_HARDENED enabled) or KASAN splat (if enabled) when running trinity syscall fuzz tests on s390x. To avoid this problem, clear the associated pointer fields in arch_dup_task_struct() immediately after the new task is copied. Note that the RI flag is still cleared in copy_thread() because it resides in thread stack memory and that is where stack info is copied.
Assessing the Risk of CVE-2022-49990
Access Complexity Graph
The exploitability of CVE-2022-49990 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-2022-49990
No exploitability data is available for CVE-2022-49990.
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-2022-49990, 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-2022-49990, 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-2022-49990 does not compromise confidentiality.
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Integrity:
None
CVE-2022-49990 does not impact data integrity.
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Availability:
None
CVE-2022-49990 does not affect system availability.
CVE-2022-49990 References
External References
- https://git.kernel.org/stable/c/13cccafe0edcd03bf1c841de8ab8a1c8e34f77d9
- https://git.kernel.org/stable/c/25a95303b9e513cd2978aacc385d06e6fec23d07
- https://git.kernel.org/stable/c/297ae7e87a87a001dd3dfeac1cb26a42fd929708
- https://git.kernel.org/stable/c/8195e065abf3df84eb0ad2987e76a40f21d1791c
- https://git.kernel.org/stable/c/cacd522e6652fbc2dc0cc6ae11c4e30782fef14b
- https://git.kernel.org/stable/c/fbdc482d43eda40a70de4b0155843d5472f6de62
CWE Common Weakness Enumeration
Unknown
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