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.
Predictions
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
OS impact
| OS | Version | Status | Fixed in |
|---|---|---|---|
| debian | bookworm | fixed | 6.1.170-1 |
| debian | bullseye | fixed | 0 |
| debian | forky | fixed | 6.19.11-1 |
| debian | sid | fixed | 6.19.11-1 |
| debian | trixie | fixed | 6.12.85-1 |
| linux-kernel | affected | 5.15.203 | |
| linux-kernel | 7.0 | affected | |
References
- https://git.kernel.org/stable/c/378949f46e897204384f3f5f91e42e93e3f87568
- https://git.kernel.org/stable/c/5c8ecdcfbfb0b0c6a82a4ebadc1ddea61609b902
- https://git.kernel.org/stable/c/c23df30915f83e7257c8625b690a1cece94142a0
- https://git.kernel.org/stable/c/d6565ea662e17d45a577184b0011bd69de22dc2b
- https://git.kernel.org/stable/c/d9d8360cb66e3b599d89d2526e7da8b530ebf2ff
- https://git.kernel.org/stable/c/da40464064599eefe78749f75cd2bba371044c04
- https://git.kernel.org/stable/c/e83e20b82859f0588e9a52a6fa9fea704a2061cf
- https://security-tracker.debian.org/tracker/CVE-2026-31467
CWEs
CWE-667
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.