CVE-2024-36946

Local service interruption via undersized Phonet notification buffers

Published May 30, 2024 · Updated May 11, 2026

Allocation error in Linux kernel Phonet route notifications allows local users to interrupt service through malformed skb construction. rtm_phonet_notify() sizes the skb with struct ifaddrmsg even though fill_route() writes the larger struct rtmsg plus RTA_DST and RTA_OIF attributes. Triggering the route-change path requires CAP_NET_ADMIN and CAP_SYS_ADMIN; failed construction raises an EMSGSIZE warning that panics kernels configured to treat warnings as fatal.

CVSS severity5.5
Medium
EPSS probability0.27%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Allocation error in Linux kernel Phonet route notifications allows local users to interrupt service through malformed skb construction. rtm_phonet_notify() sizes the skb with struct ifaddrmsg even though fill_route() writes the larger struct rtmsg plus RTA_DST and RTA_OIF attributes. Triggering the route-change path requires CAP_NET_ADMIN and CAP_SYS_ADMIN; failed construction raises an EMSGSIZE warning that panics kernels configured to treat warnings as fatal.

The record

CVE
CVE-2024-36946
Published
May 30, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-401, T1499
Attack vector
local
Privileges
Unavailable

Timeline

How it unfolded

  1. May 30, 2024CVE publishedPublication date reported by the CVE source.
  2. May 11, 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=2.6.33
  2. Affected versionversion=f062f41d06575744b9eaf725eef8a5d3b5f5b7ca <4ff334cade9dae50e4be387f71e94fae634aa9b4
  3. Affected versionversion=f062f41d06575744b9eaf725eef8a5d3b5f5b7ca <728a83160f98ee6b60df0d890141b9b7240182fe
  4. Affected versionversion=f062f41d06575744b9eaf725eef8a5d3b5f5b7ca <9a77226440008cf04ba68faf641a2d50f4998137
  5. Affected versionversion=f062f41d06575744b9eaf725eef8a5d3b5f5b7ca <d8cac8568618dcb8a51af3db1103e8d4cc4aeea7
  6. Affected versionversion=f062f41d06575744b9eaf725eef8a5d3b5f5b7ca <dc6beac059f0331de97155a89d84058d4a9e49c7
  7. Affected versionversion=f062f41d06575744b9eaf725eef8a5d3b5f5b7ca <ec1f71c05caeba0f814df77e0f511d8b4618623a
  8. Affected versionversion=f062f41d06575744b9eaf725eef8a5d3b5f5b7ca <ee9e39a6cb3ca2a3d35b4ae25547ee3526a44d00
  9. Affected versionversion=f062f41d06575744b9eaf725eef8a5d3b5f5b7ca <f085e02f0a32f6dfcfabc6535c9c4a1707cef86b

What conditions does exploitation require?

Attack vectorlocal
Required privilegesUnavailable in this record.

What is affected?

The Linux Kernel Organization · Linuxversion=2.6.33; version=f062f41d06575744b9eaf725eef8a5d3b5f5b7ca <4ff334cade9dae50e4be387f71e94fae634aa9b4; version=f062f41d06575744b9eaf725eef8a5d3b5f5b7ca <728a83160f98ee6b60df0d890141b9b7240182fe; version=f062f41d06575744b9eaf725eef8a5d3b5f5b7ca <9a77226440008cf04ba68faf641a2d50f4998137; version=f062f41d06575744b9eaf725eef8a5d3b5f5b7ca <d8cac8568618dcb8a51af3db1103e8d4cc4aeea7; version=f062f41d06575744b9eaf725eef8a5d3b5f5b7ca <dc6beac059f0331de97155a89d84058d4a9e49c7; version=f062f41d06575744b9eaf725eef8a5d3b5f5b7ca <ec1f71c05caeba0f814df77e0f511d8b4618623a; version=f062f41d06575744b9eaf725eef8a5d3b5f5b7ca <ee9e39a6cb3ca2a3d35b4ae25547ee3526a44d00; version=f062f41d06575744b9eaf725eef8a5d3b5f5b7ca <f085e02f0a32f6dfcfabc6535c9c4a1707cef86b

Published CVSS scores

5.5NVDCVSS: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
PrivilegesUnavailable
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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