CVE-2024-49947

Denial of service via undersized checksum offset

Published Oct 21, 2024 · Updated May 23, 2026

Denial of service in the Linux kernel allows local users to trigger a kernel warning by injecting a crafted packet through AF_PACKET. virtio_net_hdr_to_skb trusts an undersized csum_start value, places the transport header before the network header, and passes the invalid offset to skb_checksum_help. Exploitation requires low-privilege local packet-socket access and produces availability loss without reported confidentiality or integrity loss.

CVSS severity5.5
Medium
EPSS probability0.24%
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 trigger a kernel warning by injecting a crafted packet through AF_PACKET. virtio_net_hdr_to_skb trusts an undersized csum_start value, places the transport header before the network header, and passes the invalid offset to skb_checksum_help. Exploitation requires low-privilege local packet-socket access and produces availability loss without reported confidentiality or integrity loss.

The record

CVE
CVE-2024-49947
Published
Oct 21, 2024
Updated
May 23, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Oct 21, 2024CVE publishedPublication date reported by the CVE source.
  2. May 23, 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=342c88f406c2acd3dd00767aeacafe883cebb374 <d9dfd41e32ccc5198033ddd1ff1516822dfefa5a
  2. Affected versionversion=6.6.14 <6.6.55
  3. Affected versionversion=6.7.2 <6.8
  4. Affected versionversion=6.8
  5. Affected versionversion=765290b628c2fb764bdfaf8088754439665751e8
  6. Affected versionversion=9181d6f8a2bb32d158de66a84164fac05e3ddd18 <49d14b54a527289d09a9480f214b8c586322310a
  7. Affected versionversion=9181d6f8a2bb32d158de66a84164fac05e3ddd18 <4cc0648e9e3240496835dc698ace1d046d8d57ea
  8. Affected versionversion=9181d6f8a2bb32d158de66a84164fac05e3ddd18 <7711c419a915ee0dd91c125d2b967bbf2a72e9ac

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=342c88f406c2acd3dd00767aeacafe883cebb374 <d9dfd41e32ccc5198033ddd1ff1516822dfefa5a; version=6.6.14 <6.6.55; version=6.7.2 <6.8; version=6.8; version=765290b628c2fb764bdfaf8088754439665751e8; version=9181d6f8a2bb32d158de66a84164fac05e3ddd18 <49d14b54a527289d09a9480f214b8c586322310a; version=9181d6f8a2bb32d158de66a84164fac05e3ddd18 <4cc0648e9e3240496835dc698ace1d046d8d57ea; version=9181d6f8a2bb32d158de66a84164fac05e3ddd18 <7711c419a915ee0dd91c125d2b967bbf2a72e9ac

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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

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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