Linux Kernel up to 6.6.54/6.10.13/6.11.2 bpftool net.c nf_link_info null pointer dereference

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5.5	$0-$5k	0.00

Summaryinfo

A vulnerability was found in Linux Kernel up to 6.6.54/6.10.13/6.11.2 and classified as critical. Affected by this vulnerability is the function nf_link_info of the file net.c of the component bpftool. The manipulation results in null pointer dereference. This vulnerability is reported as CVE-2024-49987. No exploit exists. It is suggested to upgrade the affected component.

Detailsinfo

A vulnerability was found in Linux Kernel up to 6.6.54/6.10.13/6.11.2. It has been classified as critical. Affected is the function nf_link_info of the file net.c of the component bpftool. The manipulation with an unknown input leads to a null pointer dereference vulnerability. CWE is classifying the issue as 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. This is going to have an impact on availability. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: bpftool: Fix undefined behavior in qsort(NULL, 0, ...) When netfilter has no entry to display, qsort is called with qsort(NULL, 0, ...). This results in undefined behavior, as UBSan reports: net.c:827:2: runtime error: null pointer passed as argument 1, which is declared to never be null Although the C standard does not explicitly state whether calling qsort with a NULL pointer when the size is 0 constitutes undefined behavior, Section 7.1.4 of the C standard (Use of library functions) mentions: "Each of the following statements applies unless explicitly stated otherwise in the detailed descriptions that follow: If an argument to a function has an invalid value (such as a value outside the domain of the function, or a pointer outside the address space of the program, or a null pointer, or a pointer to non-modifiable storage when the corresponding parameter is not const-qualified) or a type (after promotion) not expected by a function with variable number of arguments, the behavior is undefined." To avoid this, add an early return when nf_link_info is NULL to prevent calling qsort with a NULL pointer.

The advisory is shared for download at git.kernel.org. This vulnerability is traded as CVE-2024-49987 since 10/21/2024. There are known technical details, but no exploit is available.

The vulnerability scanner Nessus provides a plugin with the ID 212574 (SUSE SLED15 / SLES15 / openSUSE 15 Security Update : bpftool (SUSE-SU-2024:4157-1)), which helps to determine the existence of the flaw in a target environment.

Upgrading to version 6.6.55, 6.10.14 or 6.11.3 eliminates this vulnerability. Applying the patch c2d9f9a7837a/2e0f6f33f2aa/c208b02827eb/f04e2ad394e2 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 databases at Tenable (212574) and CERT Bund (WID-SEC-2024-3251). Once again VulDB remains the best source for vulnerability data.

Affected

• Google Container-Optimized OS
• Debian Linux
• Amazon Linux 2
• Red Hat Enterprise Linux
• NetApp StorageGRID
• Ubuntu Linux
• SUSE Linux
• Oracle Linux
• Kyocera Printer
• NetApp AFF
• NetApp ActiveIQ Unified Manager
• SUSE openSUSE
• IBM Security Guardium
• RESF Rocky Linux
• Dell NetWorker
• Dell Avamar
• IBM QRadar SIEM
• NetApp FAS
• SolarWinds Security Event Manager
• Dell PowerProtect Data Domain
• Open Source Linux Kernel
• Dell PowerScale OneFS

Productinfo

Type

• Operating System

Vendor

• Linux

Name

• Kernel

Version

• 6.6.0
• 6.6.1
• 6.6.2
• 6.6.3
• 6.6.4
• 6.6.5
• 6.6.6
• 6.6.7
• 6.6.8
• 6.6.9
• 6.6.10
• 6.6.11
• 6.6.12
• 6.6.13
• 6.6.14
• 6.6.15
• 6.6.16
• 6.6.17
• 6.6.18
• 6.6.19
• 6.6.20
• 6.6.21
• 6.6.22
• 6.6.23
• 6.6.24
• 6.6.25
• 6.6.26
• 6.6.27
• 6.6.28
• 6.6.29
• 6.6.30
• 6.6.31
• 6.6.32
• 6.6.33
• 6.6.34
• 6.6.35
• 6.6.36
• 6.6.37
• 6.6.38
• 6.6.39
• 6.6.40
• 6.6.41
• 6.6.42
• 6.6.43
• 6.6.44
• 6.6.45
• 6.6.46
• 6.6.47
• 6.6.48
• 6.6.49
• 6.6.50
• 6.6.51
• 6.6.52
• 6.6.53
• 6.6.54
• 6.10.0
• 6.10.1
• 6.10.2
• 6.10.3
• 6.10.4
• 6.10.5
• 6.10.6
• 6.10.7
• 6.10.8
• 6.10.9
• 6.10.10
• 6.10.11
• 6.10.12
• 6.10.13
• 6.11.0
• 6.11.1
• 6.11.2

License

• open-source

Website

• Vendor: https://www.kernel.org/

CPE 2.3info

• 🔍
• 🔍
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CPE 2.2info

• 🔍
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CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 5.6
VulDB Meta Temp Score: 5.5

VulDB Base Score: 5.7
VulDB Temp Score: 5.5
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 5.5
NVD Vector: 🔍

CVSSv2info

AV	AC	Au	C	I	A
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💳	💳	💳	💳	💳	💳
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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: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
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Nessus ID: 212574
Nessus Name: SUSE SLED15 / SLES15 / openSUSE 15 Security Update : bpftool (SUSE-SU-2024:4157-1)

Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔍

Upgrade: Kernel 6.6.55/6.10.14/6.11.3
Patch: c2d9f9a7837a/2e0f6f33f2aa/c208b02827eb/f04e2ad394e2

Timelineinfo

10/21/2024 🔍
10/21/2024 +0 days 🔍
10/21/2024 +0 days 🔍
03/21/2026 +516 days 🔍

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2024-49987 (🔍)
GCVE (CVE): GCVE-0-2024-49987
GCVE (VulDB): GCVE-100-281292
CERT Bund: WID-SEC-2024-3251 - Linux Kernel: Mehrere Schwachstellen ermöglichen Denial of Service

Entryinfo

Created: 10/21/2024 21:39
Updated: 03/21/2026 18:27
Changes: 10/21/2024 21:39 (60), 10/28/2024 17:55 (11), 12/12/2024 18:25 (2), 07/27/2025 02:08 (7), 03/21/2026 18:27 (1)
Complete: 🔍
Cache ID: 216::103

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Discussion

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