iommu/tegra241-cmdqv: Free the error IRQ before tearing down VINTFs

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-90426
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-17 17:17:47 UTC
Updated2026-09-17 17:17:47 UTC
DescriptionIn 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.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 918eb5c856f6ce4cf93b4b38e4b5e156905c5943 076a4f5b1fc2016b973a12bc2ebb9b730e5e1e48 git Not specified
CNA Linux Linux affected 918eb5c856f6ce4cf93b4b38e4b5e156905c5943 735698e81f798b4c02dcb6291ffbdd1b962c8c66 git Not specified
CNA Linux Linux affected 918eb5c856f6ce4cf93b4b38e4b5e156905c5943 421f5ab135cd4a1353891e5bf2602cfc3c01afc7 git Not specified
CNA Linux Linux affected 918eb5c856f6ce4cf93b4b38e4b5e156905c5943 61f0d437988e5730b04442f6a7d30a9907339f2a git Not specified
CNA Linux Linux affected 6.12 Not specified
CNA Linux Linux unaffected 6.12 semver Not specified
CNA Linux Linux unaffected 6.12.110 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.52 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.6 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/076a4f5b1fc2016b973a12bc2ebb9b730e5e1e48 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/735698e81f798b4c02dcb6291ffbdd1b962c8c66 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/61f0d437988e5730b04442f6a7d30a9907339f2a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/421f5ab135cd4a1353891e5bf2602cfc3c01afc7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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