CVE-2022-49026

Kernel memory corruption via freed transmit buffer reuse

Published Oct 21, 2024 · Updated Aug 5, 2026

Use-after-free in the e100 driver in Linux 4.3 through 6.1-rc7 allows local users to corrupt kernel memory during packet transmission. When buffer mapping fails, e100_xmit_prepare frees the socket buffer but returns a status that makes the network stack resubmit that buffer. A local low-privileged user must send traffic through an e100 interface during that failure; reuse can crash the kernel or alter kernel memory.

CVSS severity7.8
High
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

Use-after-free in the e100 driver in Linux 4.3 through 6.1-rc7 allows local users to corrupt kernel memory during packet transmission. When buffer mapping fails, e100_xmit_prepare frees the socket buffer but returns a status that makes the network stack resubmit that buffer. A local low-privileged user must send traffic through an e100 interface during that failure; reuse can crash the kernel or alter kernel memory.

The record

CVE
CVE-2022-49026
Published
Oct 21, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-416, T1068
Attack vector
local
Privileges
authenticated

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=4.3
  2. Affected versionversion=5e5d49422dfb035ca9e280cd61d434095c151272 <45605c75c52c7ae7bfe902214343aabcfe5ba0ff
  3. Affected versionversion=5e5d49422dfb035ca9e280cd61d434095c151272 <9fc27d22cdb9b1fcd754599d216a8992fed280cd
  4. Affected versionversion=5e5d49422dfb035ca9e280cd61d434095c151272 <b46f6144ab89d3d757ead940759c505091626a7d
  5. Affected versionversion=5e5d49422dfb035ca9e280cd61d434095c151272 <b775f37d943966f6f77dca402f5a9dedce502c25

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.3; version=5e5d49422dfb035ca9e280cd61d434095c151272 <45605c75c52c7ae7bfe902214343aabcfe5ba0ff; version=5e5d49422dfb035ca9e280cd61d434095c151272 <9fc27d22cdb9b1fcd754599d216a8992fed280cd; version=5e5d49422dfb035ca9e280cd61d434095c151272 <b46f6144ab89d3d757ead940759c505091626a7d; version=5e5d49422dfb035ca9e280cd61d434095c151272 <b775f37d943966f6f77dca402f5a9dedce502c25

Published CVSS scores

7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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-416Use After Free
T1068Exploitation for Privilege Escalation

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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