CVE-2025-21874

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> dm-integrity: Avoid divide by zero in table status in Inline mode<br /> <br /> In Inline mode, the journal is unused, and journal_sectors is zero.<br /> <br /> Calculating the journal watermark requires dividing by journal_sectors,<br /> which should be done only if the journal is configured.<br /> <br /> Otherwise, a simple table query (dmsetup table) can cause OOPS.<br /> <br /> This bug did not show on some systems, perhaps only due to<br /> compiler optimization.<br /> <br /> On my 32-bit testing machine, this reliably crashes with the following:<br /> <br /> : Oops: divide error: 0000 [#1] PREEMPT SMP<br /> : CPU: 0 UID: 0 PID: 2450 Comm: dmsetup Not tainted 6.14.0-rc2+ #959<br /> : EIP: dm_integrity_status+0x2f8/0xab0 [dm_integrity]<br /> ...