CVE-2026-31467

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> erofs: add GFP_NOIO in the bio completion if needed<br /> <br /> The bio completion path in the process context (e.g. dm-verity)<br /> will directly call into decompression rather than trigger another<br /> workqueue context for minimal scheduling latencies, which can<br /> then call vm_map_ram() with GFP_KERNEL.<br /> <br /> Due to insufficient memory, vm_map_ram() may generate memory<br /> swapping I/O, which can cause submit_bio_wait to deadlock<br /> in some scenarios.<br /> <br /> Trimmed down the call stack, as follows:<br /> <br /> f2fs_submit_read_io<br /> submit_bio //bio_list is initialized.<br /> mmc_blk_mq_recovery<br /> z_erofs_endio<br /> vm_map_ram<br /> __pte_alloc_kernel<br /> __alloc_pages_direct_reclaim<br /> shrink_folio_list<br /> __swap_writepage<br /> submit_bio_wait //bio_list is non-NULL, hang!!!<br /> <br /> Use memalloc_noio_{save,restore}() to wrap up this path.