UBUNTU-CVE-2026-89552: Null Pointer Dereference

In the Linux kernel, the following vulnerability has been resolved: params: fix charp corruption on allocation failure paramsetcharp() 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 kmallocparameter() 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: zswapsetup+0x3b1/0x490 zswapenabledparamset+0x5b/0xa0 paramattrstore+0x93/0xe0 moduleattrstore+0x1c/0x30 kernfsfopwriteiter+0x116/0x1f0 Allocate and copy the replacement first, then replace the parameter value only after allocation succeeds.