CVE-2024-49978

Kernel crash via malformed UDP GSO fraglist

Published Oct 21, 2024 · Updated Aug 5, 2026

NULL-pointer dereference in affected Linux kernel branches allows attackers to crash the kernel during UDP GSO fraglist segmentation. The __udpv4_gso_segment_list_csum path dereferences udp_hdr(seg->next) after a data pull leaves an SKB_GSO_FRAGLIST head with invalid geometry and no next segment. Reachability requires a datapath hook such as NAT or bpf_skb_pull_data to pull frag_list data into the linear buffer before segmentation.

CVSS severity5.5
Medium
EPSS probability0.66%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

NULL-pointer dereference in affected Linux kernel branches allows attackers to crash the kernel during UDP GSO fraglist segmentation. The __udpv4_gso_segment_list_csum path dereferences udp_hdr(seg->next) after a data pull leaves an SKB_GSO_FRAGLIST head with invalid geometry and no next segment. Reachability requires a datapath hook such as NAT or bpf_skb_pull_data to pull frag_list data into the linear buffer before segmentation.

The record

CVE
CVE-2024-49978
Published
Oct 21, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-476, T1499
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Oct 21, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 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=5.6
  2. Affected versionversion=9fd1ff5d2ac7181844735806b0a703c942365291 <080e6c9a3908de193a48f646c5ce1bfb15676ffc
  3. Affected versionversion=9fd1ff5d2ac7181844735806b0a703c942365291 <33e28acf42ee863f332a958bfc2f1a284a3659df
  4. Affected versionversion=9fd1ff5d2ac7181844735806b0a703c942365291 <3cd00d2e3655fad3bda96dc1ebf17b6495f86fea
  5. Affected versionversion=9fd1ff5d2ac7181844735806b0a703c942365291 <a1e40ac5b5e9077fe1f7ae0eb88034db0f9ae1ab
  6. Affected versionversion=9fd1ff5d2ac7181844735806b0a703c942365291 <af3122f5fdc0d00581d6e598a668df6bf54c9daa

What conditions does exploitation require?

Attack vectorUnavailable in this record.
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=5.6; version=9fd1ff5d2ac7181844735806b0a703c942365291 <080e6c9a3908de193a48f646c5ce1bfb15676ffc; version=9fd1ff5d2ac7181844735806b0a703c942365291 <33e28acf42ee863f332a958bfc2f1a284a3659df; version=9fd1ff5d2ac7181844735806b0a703c942365291 <3cd00d2e3655fad3bda96dc1ebf17b6495f86fea; version=9fd1ff5d2ac7181844735806b0a703c942365291 <a1e40ac5b5e9077fe1f7ae0eb88034db0f9ae1ab; version=9fd1ff5d2ac7181844735806b0a703c942365291 <af3122f5fdc0d00581d6e598a668df6bf54c9daa

Published CVSS scores

7.5kernel.orgCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
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.

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)
VectorUnavailable
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-476NULL Pointer Dereference
T1499Endpoint Denial of Service

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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