CVE-2022-49993

Kernel service interruption via oversized loop offset

Published Jun 18, 2025 · Updated May 11, 2026

Integer overflow in the Linux kernel loop driver allows local users to interrupt service by configuring an oversized loop offset. Directly copying the unsigned loop_info64 lo_offset into the signed loop_device lo_offset lets values above the signed range become negative and trigger a warning in iomap_iter(). Access to a loop device and permission to issue its configuration ioctl are required; the warning affects availability without reported data disclosure or modification.

CVSS severity5.5
Medium
EPSS probability0.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Integer overflow in the Linux kernel loop driver allows local users to interrupt service by configuring an oversized loop offset. Directly copying the unsigned loop_info64 lo_offset into the signed loop_device lo_offset lets values above the signed range become negative and trigger a warning in iomap_iter(). Access to a loop device and permission to issue its configuration ioctl are required; the warning affects availability without reported data disclosure or modification.

The record

CVE
CVE-2022-49993
Published
Jun 18, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 18, 2025CVE publishedPublication date reported by the CVE source.
  2. May 11, 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 <0455bef69028c65065f16bb04635591b2374249b
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <18e28817cb516b39de6281f6db9b0618b2cc7b42
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <6858933131d0dadac071c4d33335a9ea4b8e76cf
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <9be7fa7ead18a48940df7b59d993bbc8b9055c15
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a217715338fd48f72114725aa7a40e484a781ca7
  6. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <adf0112d9b8acb03485624220b4934f69bf13369
  7. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <b40877b8562c5720d0a7fce20729f56b75a3dede
  8. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <c490a0b5a4f36da3918181a8acdc6991d967c5f3
  9. Affected versionversion=2.6.12

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <0455bef69028c65065f16bb04635591b2374249b; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <18e28817cb516b39de6281f6db9b0618b2cc7b42; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <6858933131d0dadac071c4d33335a9ea4b8e76cf; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <9be7fa7ead18a48940df7b59d993bbc8b9055c15; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a217715338fd48f72114725aa7a40e484a781ca7; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <adf0112d9b8acb03485624220b4934f69bf13369; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <b40877b8562c5720d0a7fce20729f56b75a3dede; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <c490a0b5a4f36da3918181a8acdc6991d967c5f3; version=2.6.12

Published CVSS scores

5.5NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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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)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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