CVE-2022-49776

Local kernel crash via undersized macvlan MTU

Published May 1, 2025 · Updated May 11, 2026

Denial of service in the Linux kernel allows local users to crash the IPv6 stack by activating a macvlan link with an undersized MTU. drivers/net/macvlan.c accepts a link-creation MTU below the required 68-byte minimum, although later MTU changes enforce that floor. The user needs low-privileged local access capable of creating and activating a macvlan interface; the resulting impact is a kernel crash.

CVSS severity5.5
Medium
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Denial of service in the Linux kernel allows local users to crash the IPv6 stack by activating a macvlan link with an undersized MTU. drivers/net/macvlan.c accepts a link-creation MTU below the required 68-byte minimum, although later MTU changes enforce that floor. The user needs low-privileged local access capable of creating and activating a macvlan interface; the resulting impact is a kernel crash.

The record

CVE
CVE-2022-49776
Published
May 1, 2025
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 1, 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=4.10
  2. Affected versionversion=91572088e3fdbf4fe31cf397926d8b890fdb3237 <2b055c719d8f94c15ec9b7659978133030c6a353
  3. Affected versionversion=91572088e3fdbf4fe31cf397926d8b890fdb3237 <650137a7c0b2892df2e5b0bc112d7b09a78c93c8
  4. Affected versionversion=91572088e3fdbf4fe31cf397926d8b890fdb3237 <a62aa84fe19eb24d083d600a074c009a0a66d4f3
  5. Affected versionversion=91572088e3fdbf4fe31cf397926d8b890fdb3237 <b64085b00044bdf3cd1c9825e9ef5b2e0feae91a
  6. Affected versionversion=91572088e3fdbf4fe31cf397926d8b890fdb3237 <d2fee7d121d189c6dc905b727d60e7043a6655bb
  7. Affected versionversion=91572088e3fdbf4fe31cf397926d8b890fdb3237 <e41cbf98df22d08402e65174d147cbb187fe1a33
  8. Affected versionversion=91572088e3fdbf4fe31cf397926d8b890fdb3237 <e929ec98c0c3b10d9c07f3776df0c1a02d7a763e

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.10; version=91572088e3fdbf4fe31cf397926d8b890fdb3237 <2b055c719d8f94c15ec9b7659978133030c6a353; version=91572088e3fdbf4fe31cf397926d8b890fdb3237 <650137a7c0b2892df2e5b0bc112d7b09a78c93c8; version=91572088e3fdbf4fe31cf397926d8b890fdb3237 <a62aa84fe19eb24d083d600a074c009a0a66d4f3; version=91572088e3fdbf4fe31cf397926d8b890fdb3237 <b64085b00044bdf3cd1c9825e9ef5b2e0feae91a; version=91572088e3fdbf4fe31cf397926d8b890fdb3237 <d2fee7d121d189c6dc905b727d60e7043a6655bb; version=91572088e3fdbf4fe31cf397926d8b890fdb3237 <e41cbf98df22d08402e65174d147cbb187fe1a33; version=91572088e3fdbf4fe31cf397926d8b890fdb3237 <e929ec98c0c3b10d9c07f3776df0c1a02d7a763e

Published CVSS scores

5.5NIST NVDCVSS: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

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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

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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