In the Linux kernel, the following vulnerability has been resolved: PCI: plda: Fix use-after-free of event IRQs during teardown… (CVE-2026-89455)
A use-after-free vulnerability in the Linux kernel's PCI plda driver was fixed. The issue occurs during teardown when event IRQs are freed improperly, leading to potential dereferencing of freed memory. The fix involves explicitly freeing IRQs before removing their domain and properly disposing of IRQ mappings. This vulnerability was identified through automated code review and has been tested on specific hardware.
AI Analysis
Technical Summary
The Linux kernel's PCI plda driver had a use-after-free vulnerability in the handling of event IRQs during teardown. The function plda_pcie_irq_domain_deinit() removes the event_domain via irq_domain_remove(), but the IRQs requested with devm_request_irq() are freed later by devres after the probe()/remove() function returns. This causes irq_domain_remove() to free internal data before the deferred free_irq() runs, leading to a use-after-free when devres later attempts to free the IRQs again. The patch explicitly frees each event IRQ with devm_free_irq() before removing the domain, preventing double-free and use-after-free. Additionally, IRQ mappings are disposed of properly and chained handler calls are guarded to run only for valid IRQ numbers. The fix was build- and boot-tested on StarFive VisionFive v1.2A hardware.
Potential Impact
The vulnerability could cause kernel memory corruption due to use-after-free of IRQ domain data structures during PCI device teardown. This may lead to system instability or crashes. There is no information about exploitation in the wild or specific attack scenarios.
Mitigation Recommendations
A fix is available and has been applied to the Linux kernel PCI plda driver. Users should update to the fixed kernel version containing this patch. No additional mitigation steps are indicated.
In the Linux kernel, the following vulnerability has been resolved: PCI: plda: Fix use-after-free of event IRQs during teardown… (CVE-2026-89455)
Description
A use-after-free vulnerability in the Linux kernel's PCI plda driver was fixed. The issue occurs during teardown when event IRQs are freed improperly, leading to potential dereferencing of freed memory. The fix involves explicitly freeing IRQs before removing their domain and properly disposing of IRQ mappings. This vulnerability was identified through automated code review and has been tested on specific hardware.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The Linux kernel's PCI plda driver had a use-after-free vulnerability in the handling of event IRQs during teardown. The function plda_pcie_irq_domain_deinit() removes the event_domain via irq_domain_remove(), but the IRQs requested with devm_request_irq() are freed later by devres after the probe()/remove() function returns. This causes irq_domain_remove() to free internal data before the deferred free_irq() runs, leading to a use-after-free when devres later attempts to free the IRQs again. The patch explicitly frees each event IRQ with devm_free_irq() before removing the domain, preventing double-free and use-after-free. Additionally, IRQ mappings are disposed of properly and chained handler calls are guarded to run only for valid IRQ numbers. The fix was build- and boot-tested on StarFive VisionFive v1.2A hardware.
Potential Impact
The vulnerability could cause kernel memory corruption due to use-after-free of IRQ domain data structures during PCI device teardown. This may lead to system instability or crashes. There is no information about exploitation in the wild or specific attack scenarios.
Mitigation Recommendations
A fix is available and has been applied to the Linux kernel PCI plda driver. Users should update to the fixed kernel version containing this patch. No additional mitigation steps are indicated.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-8qqp-mrfh-pvx7
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-89455"]
Threat ID: 6aa4a02455bf5e2cf5a869b4
Added to database: 09/12/2026, 00:43:16 UTC
Last enriched: 09/12/2026, 01:17:29 UTC
Last updated: 09/12/2026, 01:17:29 UTC
Views: 2
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