CVE-2024-56727

Kernel crash via unchecked mailbox error pointer

Published Dec 29, 2024 · Updated Jun 1, 2026

Invalid pointer dereference in Linux 5.11 and later allows local users to crash the kernel through OcteonTX2 NIC flow operations. In otx2_alloc_mcam_entries() and otx2_mcam_entry_init(), otx2_flows.c dereferences responses from otx2_mbox_get_rsp() without first rejecting error pointers. Reachability requires local low-privilege access and a Marvell OcteonTX2 PF network interface exercising MCAM flow allocation; the demonstrated consequence is availability loss only.

CVSS severity5.5
Medium
EPSS probability0.21%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Invalid pointer dereference in Linux 5.11 and later allows local users to crash the kernel through OcteonTX2 NIC flow operations. In otx2_alloc_mcam_entries() and otx2_mcam_entry_init(), otx2_flows.c dereferences responses from otx2_mbox_get_rsp() without first rejecting error pointers. Reachability requires local low-privilege access and a Marvell OcteonTX2 PF network interface exercising MCAM flow allocation; the demonstrated consequence is availability loss only.

The record

CVE
CVE-2024-56727
Published
Dec 29, 2024
Updated
Jun 1, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-476, T1499
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Dec 29, 2024CVE publishedPublication date reported by the CVE source.
  2. Jun 1, 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=5.11
  2. Affected versionversion=f0a1913f8a6f947531c3042f9d6524946e661b57 <8c9f8b35dc3d4ad8053a72bc0c5a7843591f6b75
  3. Affected versionversion=f0a1913f8a6f947531c3042f9d6524946e661b57 <a479b3d7586e6f77f8337bbcac980eaf2d0a4029
  4. Affected versionversion=f0a1913f8a6f947531c3042f9d6524946e661b57 <bd3110bc102ab6292656b8118be819faa0de8dd0
  5. Affected versionversion=f0a1913f8a6f947531c3042f9d6524946e661b57 <c4eae7bac880edd88aaed6a8ec2997fa85e259c7
  6. Affected versionversion=f0a1913f8a6f947531c3042f9d6524946e661b57 <e3c4e78d636e6dbd8ed72e41b311de2bb7e0b699
  7. Affected versionversion=f0a1913f8a6f947531c3042f9d6524946e661b57 <e5e60f17d2462ef5c13db4d1a54eef5778fd2295

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=5.11; version=f0a1913f8a6f947531c3042f9d6524946e661b57 <8c9f8b35dc3d4ad8053a72bc0c5a7843591f6b75; version=f0a1913f8a6f947531c3042f9d6524946e661b57 <a479b3d7586e6f77f8337bbcac980eaf2d0a4029; version=f0a1913f8a6f947531c3042f9d6524946e661b57 <bd3110bc102ab6292656b8118be819faa0de8dd0; version=f0a1913f8a6f947531c3042f9d6524946e661b57 <c4eae7bac880edd88aaed6a8ec2997fa85e259c7; version=f0a1913f8a6f947531c3042f9d6524946e661b57 <e3c4e78d636e6dbd8ed72e41b311de2bb7e0b699; version=f0a1913f8a6f947531c3042f9d6524946e661b57 <e5e60f17d2462ef5c13db4d1a54eef5778fd2295

Published CVSS scores

5.5CISA-ADPCVSS: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 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-476NULL Pointer Dereference
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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