CVE-2022-49872Network attack vector

Kernel panic via incomplete frag_list allocation check

Published May 1, 2025 · Updated Aug 5, 2026

Denial of service in Linux kernel network segmentation allows remote attackers to panic a configured gateway via crafted TCP or UDP traffic. The skb_segment function checks only the first frag_list member before retaining scatter-gather support, so a later kmalloc-backed head reaches BUG_ON when allocation types differ. The remote path requires an in-path TC or LWT BPF operation that changes gso_size on a GRO packet; the resulting kernel panic interrupts the host.

CVSS severity5.5
Medium
EPSS probability0.50%
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 Linux kernel network segmentation allows remote attackers to panic a configured gateway via crafted TCP or UDP traffic. The skb_segment function checks only the first frag_list member before retaining scatter-gather support, so a later kmalloc-backed head reaches BUG_ON when allocation types differ. The remote path requires an in-path TC or LWT BPF operation that changes gso_size on a GRO packet; the resulting kernel panic interrupts the host.

The record

CVE
CVE-2022-49872
Published
May 1, 2025
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. May 1, 2025CVE 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

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=162a5a8c3aff15c449e6b38355cdf80ab4f77a5a <5876b7f249a1ecbbcc8e35072c3828d6526d1c3a
  2. Affected versionversion=3dcbdb134f329842a38f0e6797191b885ab00a00 <50868de7dc4e7f0fcadd6029f32bf4387c102ee6
  3. Affected versionversion=3dcbdb134f329842a38f0e6797191b885ab00a00 <598d9e30927b15731e83797fbd700ecf399f42dd
  4. Affected versionversion=3dcbdb134f329842a38f0e6797191b885ab00a00 <65ad047fd83502447269fda8fd26c99077a9af47
  5. Affected versionversion=3dcbdb134f329842a38f0e6797191b885ab00a00 <9e4b7a99a03aefd37ba7bb1f022c8efab5019165
  6. Affected versionversion=3dcbdb134f329842a38f0e6797191b885ab00a00 <ad25a115f50800c6847e0d841c5c7992a9f7c1b3
  7. Affected versionversion=4.14.145 <4.14.300
  8. Affected versionversion=4.19.74 <4.19.267
  9. Affected versionversion=4.9.194 <4.9.334
  10. Affected versionversion=5.2.16 <5.3
  11. Affected versionversion=5.3
  12. Affected versionversion=55fb612bef7fd237fb70068e2b6ff1cd1543a8ef <0a9f56e525ea871d3950b90076912f5c7494f00f
  13. Affected versionversion=821302dd0c51d29269ef73a595bdff294419e2cd <bd5362e58721e4d0d1a37796593bd6e51536ce7a
  14. Affected versionversion=92984818ff8cfd97311a5e0ac27f148a00df2b54

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=162a5a8c3aff15c449e6b38355cdf80ab4f77a5a <5876b7f249a1ecbbcc8e35072c3828d6526d1c3a; version=3dcbdb134f329842a38f0e6797191b885ab00a00 <50868de7dc4e7f0fcadd6029f32bf4387c102ee6; version=3dcbdb134f329842a38f0e6797191b885ab00a00 <598d9e30927b15731e83797fbd700ecf399f42dd; version=3dcbdb134f329842a38f0e6797191b885ab00a00 <65ad047fd83502447269fda8fd26c99077a9af47; version=3dcbdb134f329842a38f0e6797191b885ab00a00 <9e4b7a99a03aefd37ba7bb1f022c8efab5019165; version=3dcbdb134f329842a38f0e6797191b885ab00a00 <ad25a115f50800c6847e0d841c5c7992a9f7c1b3; version=4.14.145 <4.14.300; version=4.19.74 <4.19.267; version=4.9.194 <4.9.334; version=5.2.16 <5.3; version=5.3; version=55fb612bef7fd237fb70068e2b6ff1cd1543a8ef <0a9f56e525ea871d3950b90076912f5c7494f00f; version=821302dd0c51d29269ef73a595bdff294419e2cd <bd5362e58721e4d0d1a37796593bd6e51536ce7a; version=92984818ff8cfd97311a5e0ac27f148a00df2b54

Published CVSS scores

5.5NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
5.5SUSECVSS: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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
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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