CVE-2024-43840

Local kernel crash via truncated trampoline pointer

Published Aug 17, 2024 · Updated Aug 5, 2026

Kernel denial of service in Linux allows local users to crash arm64 systems by invoking an affected BPF trampoline path. The arm64 BPF JIT's prepare_trampoline() uses a 48-bit vmalloc address emitter for a kzalloc-backed bpf_tramp_image, truncating wider pointers passed to __bpf_tramp_enter() and __bpf_tramp_exit(). Local low-privileged BPF access is required; the invalid pointer crashes the kernel, with no documented data disclosure or modification.

CVSS severity7.8
High
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

Kernel denial of service in Linux allows local users to crash arm64 systems by invoking an affected BPF trampoline path. The arm64 BPF JIT's prepare_trampoline() uses a 48-bit vmalloc address emitter for a kzalloc-backed bpf_tramp_image, truncating wider pointers passed to __bpf_tramp_enter() and __bpf_tramp_exit(). Local low-privileged BPF access is required; the invalid pointer crashes the kernel, with no documented data disclosure or modification.

The record

CVE
CVE-2024-43840
Published
Aug 17, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 17, 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=6.0
  2. Affected versionversion=efc9909fdce00a827a37609628223cd45bf95d0b <077149478497b2f00ff4fd9da2c892defa6418d8
  3. Affected versionversion=efc9909fdce00a827a37609628223cd45bf95d0b <19d3c179a37730caf600a97fed3794feac2b197b
  4. Affected versionversion=efc9909fdce00a827a37609628223cd45bf95d0b <6d218fcc707d6b2c3616b6cd24b948fd4825cfec
  5. Affected versionversion=efc9909fdce00a827a37609628223cd45bf95d0b <d9664e6ff040798a46cdc5d401064f55b8676c83

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.0; version=efc9909fdce00a827a37609628223cd45bf95d0b <077149478497b2f00ff4fd9da2c892defa6418d8; version=efc9909fdce00a827a37609628223cd45bf95d0b <19d3c179a37730caf600a97fed3794feac2b197b; version=efc9909fdce00a827a37609628223cd45bf95d0b <6d218fcc707d6b2c3616b6cd24b948fd4825cfec; version=efc9909fdce00a827a37609628223cd45bf95d0b <d9664e6ff040798a46cdc5d401064f55b8676c83

Published CVSS scores

5.5Amazon LinuxCVSS: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

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 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

T1499.004Endpoint Denial of Service: Application or System Exploitation

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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