Linux Kernel up to 6.12.8 bpf bpf_helper_changes_pkt_data null pointer dereference

CVSS Meta Temp Score
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CTI Interest Score
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6.6$0-$5k0.00

Summaryinfo

A vulnerability identified as critical has been detected in Linux Kernel up to 6.12.8. The impacted element is the function bpf_helper_changes_pkt_data of the component bpf. This manipulation causes an unknown weakness. This vulnerability is registered as CVE-2024-58237. No exploit is available. You should upgrade the affected component.

Detailsinfo

A vulnerability has been found in Linux Kernel up to 6.12.8 and classified as critical. Affected by this vulnerability is the function bpf_helper_changes_pkt_data of the component bpf. The CWE definition for the vulnerability is CWE-476. A NULL pointer dereference occurs when the application dereferences a pointer that it expects to be valid, but is NULL, typically causing a crash or exit. As an impact it is known to affect confidentiality, integrity, and availability. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: bpf: consider that tail calls invalidate packet pointers Tail-called programs could execute any of the helpers that invalidate packet pointers. Hence, conservatively assume that each tail call invalidates packet pointers. Making the change in bpf_helper_changes_pkt_data() automatically makes use of check_cfg() logic that computes 'changes_pkt_data' effect for global sub-programs, such that the following program could be rejected: int tail_call(struct __sk_buff *sk) { bpf_tail_call_static(sk, &jmp_table, 0); return 0; } SEC("tc") int not_safe(struct __sk_buff *sk) { int *p = (void *)(long)sk->data; ... make p valid ... tail_call(sk); *p = 42; /* this is unsafe */ ... } The tc_bpf2bpf.c:subprog_tc() needs change: mark it as a function that can invalidate packet pointers. Otherwise, it can't be freplaced with tailcall_freplace.c:entry_freplace() that does a tail call.

It is possible to read the advisory at git.kernel.org. This vulnerability is known as CVE-2024-58237 since 04/16/2025. Technical details of the vulnerability are known, but there is no available exploit.

The vulnerability scanner Nessus provides a plugin with the ID 236876 (Ubuntu 24.04 LTS : Linux kernel (GKE) vulnerabilities (USN-7515-1)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 6.12.9 eliminates this vulnerability. Applying the patch 1c2244437f9ad3dd91215f920401a14f2542dbfc/1a4607ffba35bf2a630aab299e34dd3f6e658d70 is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. The best possible mitigation is suggested to be upgrading to the latest version.

The vulnerability is also documented in the vulnerability database at Tenable (236876). Statistical analysis made it clear that VulDB provides the best quality for vulnerability data.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 6.8
VulDB Meta Temp Score: 6.6

VulDB Base Score: 8.0
VulDB Temp Score: 7.6
VulDB Vector: 🔒
VulDB Reliability: 🔍

NVD Base Score: 5.5
NVD Vector: 🔒

CVSSv2info

AVACAuCIA
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VulDB Base Score: 🔒
VulDB Temp Score: 🔒
VulDB Reliability: 🔍

Exploitinginfo

Class: Null pointer dereference
CWE: CWE-476 / CWE-404
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: Partially

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

Price Prediction: 🔍
Current Price Estimation: 🔒

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Nessus ID: 236876
Nessus Name: Ubuntu 24.04 LTS : Linux kernel (GKE) vulnerabilities (USN-7515-1)

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 6.12.9
Patch: 1c2244437f9ad3dd91215f920401a14f2542dbfc/1a4607ffba35bf2a630aab299e34dd3f6e658d70

Timelineinfo

04/16/2025 CVE reserved
05/05/2025 +19 days Advisory disclosed
05/05/2025 +0 days VulDB entry created
11/10/2025 +189 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2024-58237 (🔒)
GCVE (CVE): GCVE-0-2024-58237
GCVE (VulDB): GCVE-100-307435

Entryinfo

Created: 05/05/2025 17:17
Updated: 11/10/2025 21:59
Changes: 05/05/2025 17:17 (57), 05/09/2025 12:45 (1), 05/17/2025 12:00 (2), 11/10/2025 21:59 (13)
Complete: 🔍
Cache ID: 216:72C:103

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