CVE-2026-23265

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

f2fs: fix to do sanity check on node footer in {read,write}endio

-----------[ cut here ]------------ kernel BUG at fs/f2fs/data.c:358! Call Trace: <IRQ> blkupdaterequest+0x5eb/0xe70 block/blk-mq.c:987 blkmqendrequest+0x3e/0x70 block/blk-mq.c:1149 blkcompletereqs block/blk-mq.c:1224 [inline] blkdonesoftirq+0x107/0x160 block/blk-mq.c:1229 handlesoftirqs+0x283/0x870 kernel/softirq.c:579 __dosoftirq kernel/softirq.c:613 [inline] invokesoftirq kernel/softirq.c:453 [inline] _irqexitrcu+0xca/0x1f0 kernel/softirq.c:680 irqexitrcu+0x9/0x30 kernel/softirq.c:696 instrsysvecapictimerinterrupt arch/x86/kernel/apic/apic.c:1050 [inline] sysvecapictimerinterrupt+0xa6/0xc0 arch/x86/kernel/apic/apic.c:1050 </IRQ>

In f2fswriteend_io(), it detects there is inconsistency in between node page index (nid) and footer.nid of node page.

If footer of node page is corrupted in fuzzed image, then we load corrupted node page w/ async method, e.g. f2fsranodepages() or f2fsranodepage(), in where we won't do sanity check on node footer, once node page becomes dirty, we will encounter this bug after node page writeback.