CVE-2026-89552

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

params: fix charp corruption on allocation failure

param set charp() stores charp parameters in allocated memory after slab is available, and releases the previous value when the parameter is updated.

The previous value is released before the replacement allocation succeeds. If kmalloc parameter() fails, the setter returns -ENOMEM with the parameter left as NULL.

Failing zswap's compressor update before zswap is initialized can later trigger:

BUG: kernel NULL pointer dereference, address: 0000000000000000 RIP: 0010:strcmp+0x10/0x30 Call Trace: zswap setup+0x3b1/0x490 zswap enabled param set+0x5b/0xa0 param attr store+0x93/0xe0 module attr store+0x1c/0x30 kernfs fop write iter+0x116/0x1f0

Allocate and copy the replacement first, then replace the parameter value only after allocation succeeds.