CVE-2022-49340

Kernel crash via unchecked GRE checksum offset

Published Feb 26, 2025 · Updated Aug 5, 2026

Checksum validation failure in Linux kernel GRE transmission allows local users to crash the system with a malformed packet. After ipgre_xmit pulls an optional header, it fails to reject a CHECKSUM_PARTIAL skb whose csum_start precedes skb data, so lco_csum overflows. Reaching the fault requires low-privileged local access and the uncommon header_ops GRE path, including packets redirected through BPF.

CVSS severity5.5
Medium
EPSS probability0.28%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Checksum validation failure in Linux kernel GRE transmission allows local users to crash the system with a malformed packet. After ipgre_xmit pulls an optional header, it fails to reject a CHECKSUM_PARTIAL skb whose csum_start precedes skb data, so lco_csum overflows. Reaching the fault requires low-privileged local access and the uncommon header_ops GRE path, including packets redirected through BPF.

The record

CVE
CVE-2022-49340
Published
Feb 26, 2025
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Feb 26, 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=3d32ce5472bb2ca720bef84089b85f76a705fd1a <3d08bc3a5d9b2106f5c8bcf1adb73147824aa006
  2. Affected versionversion=4.19.207 <4.19.247
  3. Affected versionversion=4bf5d5224ffca069df4501ba5fcc6ded9c002ead
  4. Affected versionversion=5.10.68 <5.10.122
  5. Affected versionversion=5.14.7 <5.15
  6. Affected versionversion=5.15
  7. Affected versionversion=5.4.148 <5.4.198
  8. Affected versionversion=774430026bd9a472d08c5d3c33351a782315771a <7596bd7920985f7fc8579a92e48bc53ce4475b21
  9. Affected versionversion=87b34cd6485192777f632f92d592f2a71d8801a6 <fbeb8dfa8b87ef259eef0c89e39b53962a3cf604
  10. Affected versionversion=8a0ed250f911da31a2aef52101bc707846a800ff <0c92d813c7c9ca2212ecd879232e7d87362fce98
  11. Affected versionversion=8a0ed250f911da31a2aef52101bc707846a800ff <0ffa268724656633af5f37a38c212326d98ebe8c
  12. Affected versionversion=8a0ed250f911da31a2aef52101bc707846a800ff <8d21e9963bec1aad2280cdd034c8993033ef2948
  13. Affected versionversion=8a0ed250f911da31a2aef52101bc707846a800ff <e6b6f98fc7605c06c0a3baa70f62c534d7b4ce58

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3d32ce5472bb2ca720bef84089b85f76a705fd1a <3d08bc3a5d9b2106f5c8bcf1adb73147824aa006; version=4.19.207 <4.19.247; version=4bf5d5224ffca069df4501ba5fcc6ded9c002ead; version=5.10.68 <5.10.122; version=5.14.7 <5.15; version=5.15; version=5.4.148 <5.4.198; version=774430026bd9a472d08c5d3c33351a782315771a <7596bd7920985f7fc8579a92e48bc53ce4475b21; version=87b34cd6485192777f632f92d592f2a71d8801a6 <fbeb8dfa8b87ef259eef0c89e39b53962a3cf604; version=8a0ed250f911da31a2aef52101bc707846a800ff <0c92d813c7c9ca2212ecd879232e7d87362fce98; version=8a0ed250f911da31a2aef52101bc707846a800ff <0ffa268724656633af5f37a38c212326d98ebe8c; version=8a0ed250f911da31a2aef52101bc707846a800ff <8d21e9963bec1aad2280cdd034c8993033ef2948; version=8a0ed250f911da31a2aef52101bc707846a800ff <e6b6f98fc7605c06c0a3baa70f62c534d7b4ce58

Published CVSS scores

5.5UbuntuCVSS: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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo