CVE-2026-53303

In the Linux kernel, the following vulnerability has been resolved:

f2fs: protect extensionlist reading with sblock in f2fssbishow()

In f2fssbishow(), the extensionlist, extensioncount and hotextcount are read without holding sbi->sblock. If a concurrent sysfs store modifies the extension list via f2fsupdateextensionlist(), the show path may read inconsistent count and array contents, potentially leading to out-of-bounds access or displaying stale data.

Fix this by holding sb_lock around the entire extension list read and format operation.