What is CVE-2024-43840?

CVE-2024-43840 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10. CVE-2024-43840 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

What is the CVSS score for CVE-2024-43840?

CVE-2024-43840 has a CVSS score of 5.5 out of 10, rated Medium severity. The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

Is there a patch available for CVE-2024-43840?

No patch is currently available for CVE-2024-43840. Monitor the NIST NVD and your Linux distribution's security advisories for updates.

Is CVE-2024-43840 actively exploited?

CVE-2024-43840 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.

CVE-2024-43840

Medium

In the Linux kernel, the following vulnerability has been resolved: bpf, arm64: Fix trampoline for BPF_TRAMP_F_CALL_ORIG When BPF_TRAMP_F_CALL_ORIG is set, the trampoline calls __bpf_tramp_enter() and __bpf_tramp_exit() functions, passing them the struct bpf_tramp_image *im pointer as an argument in R0. The trampoline generation code uses emit_addr_mov_i64() to emit instructions for moving the bpf_tramp_image address into R0, but emit_addr_mov_i64() assumes the address to be in the vmalloc() space and uses only 48 bits. Because bpf_tramp_image is allocated using kzalloc(), its address can use more than 48-bits, in this case the trampoline will pass an invalid address to __bpf_tramp_enter/exit() causing a kernel crash. Fix this by using emit_a64_mov_i64() in place of emit_addr_mov_i64() as it can work with addresses that are greater than 48-bits.

Package Linux Kernel

Published 2024-08-17

Last modified 2025-11-03

CVSS version 3.1

Patch available

Awaiting data

CVSS 3.1 score

5.5

out of 10

Medium

Attack Vector

Local

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

Low

Integrity

None

Availability

High

Vector string

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

References

The following references provide additional information about CVE-2024-43840 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.

Debian Security
https://lists.debian.org/debian-lts-announce/2025/08/msg00010.html
Kernel patch commit
https://git.kernel.org/stable/c/077149478497b2f00ff4fd9da2c892defa6418d8
Patch
Kernel patch commit
https://git.kernel.org/stable/c/19d3c179a37730caf600a97fed3794feac2b197b
Patch
Kernel patch commit
https://git.kernel.org/stable/c/6d218fcc707d6b2c3616b6cd24b948fd4825cfec
Patch

4 patch commits total View all on NVD

Details

CVE ID CVE-2024-43840

Severity Medium

CVSS score 5.5 / 10

CVSS version 3.1

Published 2024-08-17

Modified 2025-11-03

KEV No

Patch Awaiting data

Package linux

Frequently asked questions

What is CVE-2024-43840?

CVE-2024-43840 is a Medium severity Linux kernel vulnerability with a CVSS score of 5.5 out of 10 . CVE-2024-43840 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
What is the CVSS score for CVE-2024-43840?

CVE-2024-43840 has a CVSS score of 5.5 out of 10, rated Medium severity (CVSS 3.1). The vector string is CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.
Is there a patch available for CVE-2024-43840?

No patch is currently available for CVE-2024-43840. Monitor the NIST NVD and your Linux distribution's security advisories for updates.
Is CVE-2024-43840 actively exploited?

No — CVE-2024-43840 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.