Linux Kernel CVE-2025-68168

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

jfs: fix uninitialized waitqueue in transaction manager

The transaction manager initialization in txInit() was not properly initializing TxBlock[0].waitor waitqueue, causing a crash when txEnd(0) is called on read-only filesystems.

When a filesystem is mounted read-only, txBegin() returns tid=0 to indicate no transaction. However, txEnd(0) still gets called and tries to access TxBlock[0].waitor via tid_to_tblock(0), but this waitqueue was never initialized because the initialization loop started at index 1 instead of 0.

This causes a 'non-static key' lockdep warning and system crash: INFO: trying to register non-static key in txEnd

Fix by ensuring all transaction blocks including TxBlock[0] have their waitqueues properly initialized during txInit().

The Linux kernel's JFS filesystem driver (fs/jfs transaction manager, txInit/txEnd) is affected. No CPE strings or explicit version ranges were provided in the input, and the source records CWE as N/A; the fix is distributed as eight stable-tree commits at git.kernel.org (038861414ab3, 2a9575a37218, 300b072df726, 8cae9cf23e0b, a2aa97cde985, cbf2f527ae4c, d2dd7ca05a11, d6af7fce2e16), indicating backports across multiple maintained stable branches rather than a single release. Exact vulnerable-to-fixed version boundaries are not stated in the data and should be confirmed against the corresponding kernel.org stable changelogs.