CVE-2024-43880

Kernel memory corruption via cross-TCAM hint matching

Published Aug 21, 2024 · Updated Aug 5, 2026

Memory corruption in Linux mlxsw ACL aggregation allows local users to crash or corrupt the kernel through crafted tc flower filters. The driver's object comparator ignores whether masks belong to A-TCAM or C-TCAM, so recursive hint lookup assigns unsupported nested parents and misinterprets an aggregation delta as a full object. Exploitation requires CAP_NET_ADMIN over a Spectrum-2-or-newer mlxsw port; the type confusion can corrupt kernel memory, bypass ACL policy, or wedge filter operations.

CVSS severity7.8
High
EPSS probability0.23%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory corruption in Linux mlxsw ACL aggregation allows local users to crash or corrupt the kernel through crafted tc flower filters. The driver's object comparator ignores whether masks belong to A-TCAM or C-TCAM, so recursive hint lookup assigns unsupported nested parents and misinterprets an aggregation delta as a full object. Exploitation requires CAP_NET_ADMIN over a Spectrum-2-or-newer mlxsw port; the type confusion can corrupt kernel memory, bypass ACL policy, or wedge filter operations.

The record

CVE
CVE-2024-43880
Published
Aug 21, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-401, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 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=5.1
  2. Affected versionversion=9069a3817d82b01b3a55da382c774e3575946130 <0e59c2d22853266704e127915653598f7f104037
  3. Affected versionversion=9069a3817d82b01b3a55da382c774e3575946130 <25c6fd9648ad05da493a5d30881896a78a08b624
  4. Affected versionversion=9069a3817d82b01b3a55da382c774e3575946130 <36a9996e020dd5aa325e0ecc55eb2328288ea6bb
  5. Affected versionversion=9069a3817d82b01b3a55da382c774e3575946130 <4dc09f6f260db3c4565a4ec52ba369393598f2fb
  6. Affected versionversion=9069a3817d82b01b3a55da382c774e3575946130 <97d833ceb27dc19f8777d63f90be4a27b5daeedf
  7. Affected versionversion=9069a3817d82b01b3a55da382c774e3575946130 <9a5261a984bba4f583d966c550fa72c33ff3714e
  8. Affected versionversion=9069a3817d82b01b3a55da382c774e3575946130 <fb5d4fc578e655d113f09565f6f047e15f7ab578

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.1; version=9069a3817d82b01b3a55da382c774e3575946130 <0e59c2d22853266704e127915653598f7f104037; version=9069a3817d82b01b3a55da382c774e3575946130 <25c6fd9648ad05da493a5d30881896a78a08b624; version=9069a3817d82b01b3a55da382c774e3575946130 <36a9996e020dd5aa325e0ecc55eb2328288ea6bb; version=9069a3817d82b01b3a55da382c774e3575946130 <4dc09f6f260db3c4565a4ec52ba369393598f2fb; version=9069a3817d82b01b3a55da382c774e3575946130 <97d833ceb27dc19f8777d63f90be4a27b5daeedf; version=9069a3817d82b01b3a55da382c774e3575946130 <9a5261a984bba4f583d966c550fa72c33ff3714e; version=9069a3817d82b01b3a55da382c774e3575946130 <fb5d4fc578e655d113f09565f6f047e15f7ab578

Published CVSS scores

5.5NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
7.8Linux kernel CNACVSS: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

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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-401Missing Release of Memory after Effective Lifetime
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

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Your stack

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