CVE-2026-64430: NTB: epf: Avoid calling pci_irq_vector() from hardirq context
Vulnerability summary
CVE-2026-64430 is a high (CVSS 7.5) vulnerability in linux. EPSS estimates a 0.49% chance of exploitation in the next 30 days, higher than 42.2% of scored vulnerabilities.
Severe, CVSS 7.5 (CVE.org); no exploitation reported by the 5 checked sources; EPSS 0% (FIRST, 05-11-2026)
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 23 · Related 23Timeline
- 25-07-2026PublishedVulnerability first disclosed.
- 17-08-2026Last modifiedVulnerability information updated.
Description
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.
CVSS metrics
4 scores · 4 sources · 1 version- OSV · UbuntuEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- OSV · DebianEcosystem advisory · calculated7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- NVDNIST7.5HighCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS trend
Probability
0.49%
Chance of exploitation in the next 30 days
Percentile
42%
Versus all other CVEs
30-day change
Decrease -0.21 pp
From 0.70% on 06-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeNo weakness data has been published for this record.
Affected systems
Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.
Ubuntu157 products
- linuxAll versions (No fix recorded) | < 5.15.0-198.208 | < 6.8.0-147.147 | < 7.0.0-31.31
- linux-allwinner-5.19All versions (No fix recorded)
- linux-awsAll versions (No fix recorded) | < 5.15.0-1117.124 | < 6.8.0-1067.70 | < 7.0.0-1012.12
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.11All versions (No fix recorded)
Debian2 products
- linux< 6.1.180-1 | < 6.12.96-1 | < 7.1.4-1
- linux-6.12< 6.12.100-1~deb12u1
Linux2 products
- linux≥ 812ce2f8d14ea791edd88c36ebcc9017bf4c88cb, < 33bba331a4a5fee8b6026fe72eca13cceeec1b7b | ≥ 812ce2f8d14ea791edd88c36ebcc9017bf4c88cb, < aff271b12a1eb8c8b3da19223ae1a6abe1e8168b | ≥ 812ce2f8d14ea791edd88c36ebcc9017bf4c88cb, < 1dba8444ac0100133d72374634f6d7451fff1ccc | ≥ 812ce2f8d14ea791edd88c36ebcc9017bf4c88cb, < 174a97f21bf9c54fa37ec0f321692e862ea130a3 | ≥ 812ce2f8d14ea791edd88c36ebcc9017bf4c88cb, < f71e8d9875069fa73e335f63f02ec6e52e3aaa51 | ≥ 812ce2f8d14ea791edd88c36ebcc9017bf4c88cb, < 6350df503897d57c5634f71b0767d48c3b837583 | ≥ 812ce2f8d14ea791edd88c36ebcc9017bf4c88cb, < 4dcddc1c794d1c65eda68f1f8dd04a0fecc0870f | 5.12
- linux_kernel≥ 5.12, < 5.15.212 | ≥ 5.16, < 6.1.178 | ≥ 6.2, < 6.6.145 | ≥ 6.7, < 6.12.96 | ≥ 6.13, < 6.18.39 | ≥ 6.19, < 7.1.4
3 vendors · 161 products
