CVE-2026-31467

Description

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

PUBLISHED Reserved 2026-03-09 | Published 2026-04-22 | Updated 2026-04-27 | Assigner Linux

Product status

References

git.kernel.org/...c/d6565ea662e17d45a577184b0011bd69de22dc2b

git.kernel.org/...c/d9d8360cb66e3b599d89d2526e7da8b530ebf2ff

git.kernel.org/...c/5c8ecdcfbfb0b0c6a82a4ebadc1ddea61609b902

git.kernel.org/...c/378949f46e897204384f3f5f91e42e93e3f87568

git.kernel.org/...c/da40464064599eefe78749f75cd2bba371044c04

git.kernel.org/...c/e83e20b82859f0588e9a52a6fa9fea704a2061cf

git.kernel.org/...c/c23df30915f83e7257c8625b690a1cece94142a0

cve.org (CVE-2026-31467)

nvd.nist.gov (CVE-2026-31467)

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