CVE-2024-48875 btrfs: don't take dev_replace rwsem on task already holding it

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This article is one source in a clustered incident — the cluster page carries the summary, timeline and every other outlet covering it.

Multiple CVEs Identified in btrfs File System Five Common Vulnerabilities and Exposures (CVEs) affecting the btrfs file system were published, addressing various issues including use-after-free vulnerabilities and improper cleanup processes. The vulnerabilities could potentially impact systems utilizing the btrfs file system, necessitating immediate attention from system administrators and developers to mitigate risks associated with these flaws. 15 sources 48