CVE-2022-49728

Service interruption via IPv6 length overflow

Published Feb 26, 2025 · Updated May 11, 2026

Signed integer overflow in Linux kernel IPv6 output allows local users to interrupt service through a crafted oversized UDPv6 send. The __ip6_append_data function accumulates a large send length in a signed int, causing an addition above INT_MAX to overflow. A local low-privileged account able to issue IPv6 datagram send calls is required, and the published impact is limited to availability.

CVSS severity5.5
Medium
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Signed integer overflow in Linux kernel IPv6 output allows local users to interrupt service through a crafted oversized UDPv6 send. The __ip6_append_data function accumulates a large send length in a signed int, causing an addition above INT_MAX to overflow. A local low-privileged account able to issue IPv6 datagram send calls is required, and the published impact is limited to availability.

The record

CVE
CVE-2022-49728
Published
Feb 26, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-190, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 26, 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 <70549c80fe80ac4e2a22068c76ebebced24f7e74
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <84dc940890e91e42898e4443a093281702440abf
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <f26422eabeb517629568edf8c2dd9c6cb9147584
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <f93431c86b631bbca5614c66f966bf3ddb3c2803
  5. Affected versionversion=2.6.12

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <70549c80fe80ac4e2a22068c76ebebced24f7e74; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <84dc940890e91e42898e4443a093281702440abf; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <f26422eabeb517629568edf8c2dd9c6cb9147584; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <f93431c86b631bbca5614c66f966bf3ddb3c2803; 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 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-190Integer Overflow or Wraparound
T1499Endpoint Denial of Service

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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