Linux Kernel up to 7.1.3 Ntb Epf ntb_epf_vec_isr locking

CVSS Meta Temp Score
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CTI Interest Score
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4.2$0-$5k1.59

Summaryinfo

A vulnerability was found in Linux Kernel up to 7.1.3. It has been rated as problematic. Affected by this vulnerability is the function ntb_epf_vec_isr of the component Ntb Epf. Performing a manipulation results in locking. This vulnerability is cataloged as CVE-2026-64430. The attack must be initiated from a local position. There is no exploit available.

Detailsinfo

A vulnerability classified as problematic has been found in Linux Kernel up to 7.1.3. This affects the function ntb_epf_vec_isr of the component Ntb Epf. The manipulation with an unknown input leads to a locking vulnerability. CWE is classifying the issue as CWE-667. The product does not properly acquire or release a lock on a resource, leading to unexpected resource state changes and behaviors. This is going to have an impact on integrity, and availability. The summary by CVE is:

In the Linux kernel, the following vulnerability has been resolved: NTB: epf: Avoid calling pci_irq_vector() from hardirq context ntb_epf_vec_isr() calls pci_irq_vector() in hardirq context to derive the vector number. pci_irq_vector() calls msi_get_virq() that takes a mutex and can therefore trigger "scheduling while atomic" splats: BUG: scheduling while atomic: kworker/u33:0/55/0x00010001 ... Call trace: ... schedule+0x38/0x110 schedule_preempt_disabled+0x28/0x50 __mutex_lock.constprop.0+0x848/0x908 __mutex_lock_slowpath+0x18/0x30 mutex_lock+0x4c/0x60 msi_domain_get_virq+0xe8/0x138 pci_irq_vector+0x2c/0x60 ntb_epf_vec_isr+0x28/0x120 [ntb_hw_epf] __handle_irq_event_percpu+0x70/0x3a8 handle_irq_event+0x48/0x100 handle_edge_irq+0x100/0x1c8 ... Cache the Linux IRQ number for vector 0 when vectors are allocated and use it as a base in the ISR. Running the ISR in a threaded IRQ handler would also avoid the problem, but that would be unnecessary here.

The advisory is shared at git.kernel.org. This vulnerability is uniquely identified as CVE-2026-64430 since 07/19/2026. The exploitability is told to be easy. An attack has to be approached locally. Technical details are known, but no exploit is available. The price for an exploit might be around USD $0-$5k at the moment (estimation calculated on 07/25/2026).

Upgrading to version 5.15.212, 6.1.178, 6.6.145, 6.12.96, 6.18.39, 7.1.4 or 7.2-rc1 eliminates this vulnerability. Applying the patch 33bba331a4a5fee8b6026fe72eca13cceeec1b7b/aff271b12a1eb8c8b3da19223ae1a6abe1e8168b/1dba8444ac0100133d72374634f6d7451fff1ccc/174a97f21bf9c54fa37ec0f321692e862ea130a3/f71e8d9875069fa73e335f63f02ec6e52e3aaa51/6350df503897d57c5634f71b0767d48c3b837583/4dcddc1c794d1c65eda68f1f8dd04a0fecc0870f is able to eliminate this problem.

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

Productinfo

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CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.4
VulDB Meta Temp Score: 4.2

VulDB Base Score: 4.4
VulDB Temp Score: 4.2
VulDB Vector: 🔒
VulDB Reliability: 🔍

CVSSv2info

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

Exploitinginfo

Class: Locking
CWE: CWE-667
CAPEC: 🔒
ATT&CK: 🔒

Physical: Partially
Local: Yes
Remote: No

Availability: 🔒
Status: Not defined

EPSS Score: 🔒
EPSS Percentile: 🔒

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 5.15.212/6.1.178/6.6.145/6.12.96/6.18.39/7.1.4/7.2-rc1
Patch: 33bba331a4a5fee8b6026fe72eca13cceeec1b7b/aff271b12a1eb8c8b3da19223ae1a6abe1e8168b/1dba8444ac0100133d72374634f6d7451fff1ccc/174a97f21bf9c54fa37ec0f321692e862ea130a3/f71e8d9875069fa73e335f63f02ec6e52e3aaa51/6350df503897d57c5634f71b0767d48c3b837583/4dcddc1c794d1c65eda68f1f8dd04a0fecc0870f

Timelineinfo

07/19/2026 CVE reserved
07/25/2026 +6 days Advisory disclosed
07/25/2026 +0 days VulDB entry created
07/25/2026 +0 days VulDB entry last update

Sourcesinfo

Vendor: kernel.org

Advisory: git.kernel.org
Status: Confirmed

CVE: CVE-2026-64430 (🔒)
GCVE (CVE): GCVE-0-2026-64430
GCVE (VulDB): GCVE-100-383229

Entryinfo

Created: 07/25/2026 18:41
Changes: 07/25/2026 18:41 (59)
Complete: 🔍
Cache ID: 216::103

If you want to get the best quality for vulnerability data then you always have to consider VulDB.

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