EUVD-2026-18643
GHSA-rc42-xqq7-h58r
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3Description
In the Linux kernel, the following vulnerability has been resolved: btrfs: free pages on error in btrfs_uring_read_extent() In this function the 'pages' object is never freed in the hopes that it is picked up by btrfs_uring_read_finished() whenever that executes in the future. But that's just the happy path. Along the way previous allocations might have gone wrong, or we might not get -EIOCBQUEUED from btrfs_encoded_read_regular_fill_pages(). In all these cases, we go to a cleanup section that frees all memory allocated by this function without assuming any deferred execution, and this also needs to happen for the 'pages' allocation.
Analysis
Linux kernel btrfs subsystem fails to free allocated pages in btrfs_uring_read_extent() when error conditions occur before asynchronous I/O completion, leading to memory leaks. The vulnerability affects all Linux kernel versions with the vulnerable btrfs implementation; while tagged as Information Disclosure, the primary impact is denial of service through memory exhaustion rather than data exposure. …
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