Memory Allocation Vulnerability in Linux Kernel Affecting Multiple Distributions
CVE-2025-38517
What is CVE-2025-38517?
The Linux kernel exhibits a vulnerability within the memory allocation system due to improper semaphore locking in the alloc_tag_top_users function. This vulnerability arises when alloc_tag_cttype is either unallocated or initialized incorrectly, leading to a crash on memory allocation failure. If the alloc_tag_cttype is null or represents an error state, an attempt to acquire a non-existent semaphore occurs, causing a general protection fault. The vulnerability is easier to trigger under specific conditions, especially when memory profiling is disabled during boot, making it critical for system stability.

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Affected Version(s)
Linux 1438d349d16b78d88f9e978a4a5496f078c8191b
Linux 1438d349d16b78d88f9e978a4a5496f078c8191b < 22bf79c0c2301b6e15a688220284b147774d277e
Linux 1438d349d16b78d88f9e978a4a5496f078c8191b < 99af22cd34688cc0d535a1919e0bea4cbc6c1ea1