CVE-2024-49980

Local service interruption via VRF locking regression

Published Oct 21, 2024 · Updated May 11, 2026

Improper locking in Linux kernel VRF networking allows local users to interrupt service by sending traffic through a VRF interface. The vrf_finish_direct path calls dev_queue_xmit_nit with bottom halves enabled after removal of its RCU-bh critical section, violating the transmit helper's locking invariant. A low-privileged local user must exercise VRF output; recursive AF_PACKET locking can deadlock the kernel, with no reported confidentiality or integrity impact.

CVSS severity5.5
Medium
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Improper locking in Linux kernel VRF networking allows local users to interrupt service by sending traffic through a VRF interface. The vrf_finish_direct path calls dev_queue_xmit_nit with bottom halves enabled after removal of its RCU-bh critical section, violating the transmit helper's locking invariant. A low-privileged local user must exercise VRF output; recursive AF_PACKET locking can deadlock the kernel, with no reported confidentiality or integrity impact.

The record

CVE
CVE-2024-49980
Published
Oct 21, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-667, T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 21, 2024CVE 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=504fc6f4f7f681d2a03aa5f68aad549d90eab853 <718a752bd746b3f4dd62516bb437baf73d548415
  2. Affected versionversion=504fc6f4f7f681d2a03aa5f68aad549d90eab853 <8c9381b3138246d46536db93ed696832abd70204
  3. Affected versionversion=504fc6f4f7f681d2a03aa5f68aad549d90eab853 <b04c4d9eb4f25b950b33218e33b04c94e7445e51
  4. Affected versionversion=504fc6f4f7f681d2a03aa5f68aad549d90eab853 <e61f8c4d179b2ffc0d3b7f821c3734be738643d0
  5. Affected versionversion=6.6

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=504fc6f4f7f681d2a03aa5f68aad549d90eab853 <718a752bd746b3f4dd62516bb437baf73d548415; version=504fc6f4f7f681d2a03aa5f68aad549d90eab853 <8c9381b3138246d46536db93ed696832abd70204; version=504fc6f4f7f681d2a03aa5f68aad549d90eab853 <b04c4d9eb4f25b950b33218e33b04c94e7445e51; version=504fc6f4f7f681d2a03aa5f68aad549d90eab853 <e61f8c4d179b2ffc0d3b7f821c3734be738643d0; version=6.6

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

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-667Improper Locking
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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