CVE-2026-90426iommu/tegra241-cmdqv: Free the error IRQ before tearing down VINTFs
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No exploitation reported and no EPSS estimate yet.
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In the Linux kernel, the following vulnerability has been resolved: iommu/tegra241-cmdqv: Free the error IRQ before tearing down VINTFs tegra241_cmdqv_remove() tears each VINTF down first, then calls free_irq(). Tearing a VINTF down frees vintf0 and clears cmdqv->vintfs[0]. An error in that window makes tegra241_cmdqv_isr() read the stale slot and hand it to tegra241_vintf0_handle_error(), which dereferences a NULL or freed pointer. Free the IRQ before tearing the VINTFs down. free_irq() waits for in-flight handlers to finish and blocks new ones, so no ISR can observe a VINTF as it is torn down. Note: a user-owned VINTF (viommu) could outlive this teardown, which unmaps cmdqv->base and frees cmdqv->vintfs, so a later viommu close then touches freed memory. This is neither introduced nor fixed here: a physical IOMMU is not a pluggable device, so iommufd by design holds no reference on the one behind a viommu, and this teardown is not expected while that viommu is still alive.
- CVSS
- Not yet scored
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Sep 17, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | 918eb5c856f6ce4cf93b4b38e4b5e156905c5943 builds before 076a4f5b1fc2016b973a12bc2ebb9b730e5e1e48; from 918eb5c856f6ce4cf93b4b38e4b5e156905c5943 before 735698e81f798b4c02dcb6291ffbdd1b962c8c66; 918eb5c856f6ce4cf93b4b38e4b5e156905c5943 builds before 421f5ab135cd4a1353891e5bf2602cfc3c01afc7; 918eb5c856f6ce4cf93b4b38e4b5e156905c5943 builds before 61f0d437988e5730b04442f6a7d30a9907339f2a | CNA record |
References
- https://git.kernel.org/stable/c/076a4f5b1fc2016b973a12bc2ebb9b730e5e1e48
- https://git.kernel.org/stable/c/735698e81f798b4c02dcb6291ffbdd1b962c8c66
- https://git.kernel.org/stable/c/421f5ab135cd4a1353891e5bf2602cfc3c01afc7
- https://git.kernel.org/stable/c/61f0d437988e5730b04442f6a7d30a9907339f2a
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.