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Vulnerability DatabaseCVE-2022-49651
CVE-2022-49651:
Linux Kernel vulnerability analysis and mitigation
Overview
CVE-2022-49651 affects the Linux kernel's SRCU (Sleepable Read-Copy Update) subsystem. The vulnerability was discovered in the cleanupsrcustruct() function, which had insufficient checks for grace periods, potentially leading to use-after-free conditions (Kernel Commit).
Technical details
The cleanupsrcustruct() function only checked for grace periods in progress but failed to verify grace periods that had not yet started but could begin at any time. This oversight could result in a use-after-free vulnerability when the SRCU structure was being cleaned up (Kernel Commit).
Impact
The vulnerability could lead to use-after-free conditions in the kernel's SRCU subsystem, potentially resulting in system instability or privilege escalation (Kernel Commit).
Mitigation and workarounds
The issue was fixed by adding additional checks in cleanupsrcustruct() to verify grace periods that are needed but not yet started. The fix involves comparing rcuseqcurrent with srcugpseq_needed to ensure proper synchronization (Kernel Commit).
Additional resources
Source: This report was generated using AI
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