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Vulnerability record · CVE-2026-31467 · published 22 April 2026

CVE-2026-31467: Linux kernel vulnerability

Linux · Linux Kernel

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.

7.5 CVSS 3.1 High EPSS 0.54% · top 56.8% CWE-667 · CWE-667
7.5CVSS 3.1 base score
0.54%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
7References
17 Jun 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://git.kernel.org/stable/c/378949f46e897204384f3f5f91e42e93e3f87568 Patch
https://git.kernel.org/stable/c/5c8ecdcfbfb0b0c6a82a4ebadc1ddea61609b902 Patch
https://git.kernel.org/stable/c/c23df30915f83e7257c8625b690a1cece94142a0 Patch
https://git.kernel.org/stable/c/d6565ea662e17d45a577184b0011bd69de22dc2b Patch
https://git.kernel.org/stable/c/d9d8360cb66e3b599d89d2526e7da8b530ebf2ff Patch
https://git.kernel.org/stable/c/da40464064599eefe78749f75cd2bba371044c04 Patch
https://git.kernel.org/stable/c/e83e20b82859f0588e9a52a6fa9fea704a2061cf Patch

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Source: NIST National Vulnerability Database (record CVE-2026-31467), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.