# CVE-2026-31467

> Vulnerability · severity: **HIGH** (CVSS 7.5).

## 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.

## Key facts

- **CVE ID:** CVE-2026-31467
- **Published:** 2026-04-22
- **CVSS severity:** HIGH
- **CVSS base score:** 7.5
- **CWE codes:** CWE-667

## Affected products

- `linux:linux_kernel`

## Primary sources

- NIST NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-31467

## Citation

> AI Analytics. CVE-2026-31467. Retrieved 2026-07-20 from https://api.ai-analytics.org/cve/CVE-2026-31467. Derived from NIST NVD. Licensed CC0.

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