# CVE-2026-43311: soc/tegra: pmc: Fix unsafe generic_handle_irq() call

CVE-2026-43311 is fixed in linux on 1 platform, first by DEBIAN-CVE-2026-43311, released May 15, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-43311
- Priority: Routine
- CVSS: 5.5 (Moderate)
- EPSS: 0.0012
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: May 8, 2026
- Vendor advisory: https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-43311

## Description

In the Linux kernel, the following vulnerability has been resolved:  soc/tegra: pmc: Fix unsafe generic_handle_irq() call  Currently, when resuming from system suspend on Tegra platforms, the following warning is observed:  WARNING: CPU: 0 PID: 14459 at kernel/irq/irqdesc.c:666 Call trace:  handle_irq_desc+0x20/0x58 (P)  tegra186_pmc_wake_syscore_resume+0xe4/0x15c  syscore_resume+0x3c/0xb8  suspend_devices_and_enter+0x510/0x540  pm_suspend+0x16c/0x1d8  The warning occurs because generic_handle_irq() is being called from a non-interrupt context which is considered as unsafe.  Fix this warning by deferring generic_handle_irq() call to an IRQ work which gets executed in hard IRQ context where generic_handle_irq() can be called safely.  When PREEMPT_RT kernels are used, regular IRQ work (initialized with init_irq_work) is deferred to run in per-CPU kthreads in preemptible context rather than hard IRQ context. Hence, use the IRQ_WORK_INIT_HARD variant so that with PREEMPT_RT kernels, the IRQ work is processed in hardirq context instead of being deferred to a thread which is required for calling generic_handle_irq().  On non-PREEMPT_RT kernels, both init_irq_work() and IRQ_WORK_INIT_HARD() execute in IRQ context, so this change has no functional impact for standard kernel configurations.  [treding@nvidia.com: miscellaneous cleanups]

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 13.5 (trixie) | 6.12.115-2 | [DEBIAN-CVE-2026-43311](https://patchblox.com/security/data/fix/linux/debian-cve-2026-43311.md) | May 15, 2026 |
| Linux | linux Debian 14 | 6.19.6-1 | [DEBIAN-CVE-2026-43311](https://patchblox.com/security/data/fix/linux/debian-cve-2026-43311.md) | May 15, 2026 |

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Data as of 2026-11-08T06:59:42Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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