CVE-2026-31467Network attack vector

Remote system hang via EROFS bio deadlock

Published Apr 22, 2026 · Updated Apr 22, 2026

Deadlock in Linux Kernel EROFS allows remote attackers to hang affected systems during low-memory compressed-file reads. The process-context bio completion path calls vm_map_ram() with GFP_KERNEL, permitting direct reclaim to issue swapping I/O while submit_bio() already has an active bio list. Reachability requires compressed EROFS data, a process-context completion path such as dm-verity, and memory pressure; the bounded result is an I/O deadlock and system hang.

CVSS severity7.5
High
EPSS probability0.38%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Deadlock in Linux Kernel EROFS allows remote attackers to hang affected systems during low-memory compressed-file reads. The process-context bio completion path calls vm_map_ram() with GFP_KERNEL, permitting direct reclaim to issue swapping I/O while submit_bio() already has an active bio list. Reachability requires compressed EROFS data, a process-context completion path such as dm-verity, and memory pressure; the bounded result is an I/O deadlock and system hang.

The record

CVE
CVE-2026-31467
Published
Apr 22, 2026
Updated
Apr 22, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-667, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Apr 22, 2026CVE publishedPublication date reported by the CVE source.
  2. Apr 22, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <378949f46e897204384f3f5f91e42e93e3f87568
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <5c8ecdcfbfb0b0c6a82a4ebadc1ddea61609b902
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <c23df30915f83e7257c8625b690a1cece94142a0
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d6565ea662e17d45a577184b0011bd69de22dc2b
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d9d8360cb66e3b599d89d2526e7da8b530ebf2ff
  6. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <da40464064599eefe78749f75cd2bba371044c04
  7. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <e83e20b82859f0588e9a52a6fa9fea704a2061cf

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <378949f46e897204384f3f5f91e42e93e3f87568; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <5c8ecdcfbfb0b0c6a82a4ebadc1ddea61609b902; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <c23df30915f83e7257c8625b690a1cece94142a0; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d6565ea662e17d45a577184b0011bd69de22dc2b; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d9d8360cb66e3b599d89d2526e7da8b530ebf2ff; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <da40464064599eefe78749f75cd2bba371044c04; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <e83e20b82859f0588e9a52a6fa9fea704a2061cf

Published CVSS scores

7.5kernel.orgCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-667Improper Locking
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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