Linux Kernel up to 6.18.39/7.1.4/7.2-rc1 fprobe kernel/trace/fprobe.c fprobe_fgraph_entry null pointer dereference

CVSS Meta Temp Score
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CTI Interest Score
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4.7$0-$5k0.48+

Summaryinfo

A vulnerability labeled as problematic has been found in Linux Kernel up to 6.18.39/7.1.4/7.2-rc1. The impacted element is the function fprobe_fgraph_entry of the file kernel/trace/fprobe.c of the component fprobe. The manipulation results in null pointer dereference. This vulnerability is reported as CVE-2026-72385. The attack can be launched remotely. No exploit exists.

Detailsinfo

A vulnerability was found in Linux Kernel up to 6.18.39/7.1.4/7.2-rc1. It has been classified as problematic. Affected is the function fprobe_fgraph_entry of the file kernel/trace/fprobe.c of the component fprobe. 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: tracing/fprobe: Fix NULL pointer dereference in fprobe_fgraph_entry() fprobe_fgraph_entry() sizes a shadow-stack reservation in one walk of the per-ip fprobe list and fills it in a second walk, both under rcu_read_lock() only. A fprobe registered on an already-live ip can become visible between the two walks, so the fill walk processes an exit_handler the sizing walk did not count and used runs past reserved_words. If the sizing walk counted nothing, fgraph_data is NULL and the first write_fprobe_header() faults: Oops: general protection fault, probably for non-canonical address ... KASAN: null-ptr-deref in range [0x0000000000000000-0x0000000000000007] RIP: 0010:fprobe_fgraph_entry+0xa38/0xf10 kernel/trace/fprobe.c:167 Call Trace: <TASK> function_graph_enter_regs+0x44c/0xa10 kernel/trace/fgraph.c:677 ftrace_graph_func+0xc5/0x140 arch/x86/kernel/ftrace.c:671 __kernel_text_address+0x9/0x40 kernel/extable.c:78 arch_stack_walk+0x117/0x170 arch/x86/kernel/stacktrace.c:26 kmem_cache_free+0x188/0x580 mm/slub.c:6378 tcp_data_queue+0x18d/0x6550 net/ipv4/tcp_input.c:5590 [...] </TASK> The list cannot be frozen across the two walks, so skip a node that does not fit the reservation and count it as missed.

The advisory is available at git.kernel.org. This vulnerability is traded as CVE-2026-72385 since 08/09/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. Additional levels of successful authentication are required for exploitation. Technical details are known, but there is no available exploit.

Upgrading to version 6.18.40, 7.1.5 or 7.2-rc2 eliminates this vulnerability. Applying the patch 62988204162fc382cfc7d9a185d40a751261e3a3/d655cca1c6e67eb081214d37eb231a869ead2f97/367c49d6e283c17b56a31e7a8d964a079244264c is able to eliminate this problem.

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Productinfo

Type

Vendor

Name

Version

License

Website

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.9
VulDB Meta Temp Score: 4.7

VulDB Base Score: 4.9
VulDB Temp Score: 4.7
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

AVACAuCIA
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💳💳💳💳💳💳
💳💳💳💳💳💳
VectorComplexityAuthenticationConfidentialityIntegrityAvailability
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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: No
Local: No
Remote: Yes

Availability: 🔒
Status: Not defined
Price Prediction: 🔍
Current Price Estimation: 🔒

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Threat Intelligenceinfo

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

Countermeasuresinfo

Recommended: Upgrade
Status: 🔍

0-Day Time: 🔒

Upgrade: Kernel 6.18.40/7.1.5/7.2-rc2
Patch: 62988204162fc382cfc7d9a185d40a751261e3a3/d655cca1c6e67eb081214d37eb231a869ead2f97/367c49d6e283c17b56a31e7a8d964a079244264c

Timelineinfo

08/09/2026 CVE reserved
08/15/2026 +6 days Advisory disclosed
08/15/2026 +0 days VulDB entry created
08/15/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-72385 (🔒)
GCVE (CVE): GCVE-0-2026-72385
GCVE (VulDB): GCVE-100-391002

Entryinfo

Created: 08/15/2026 16:54
Changes: 08/15/2026 16:54 (60)
Complete: 🔍
Cache ID: 216::103

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