CVE-2026-90426
2026-09-17
17h17 +00:00
17h17 +00:00
Thông báo cho một CVE
Luôn được thông báo về mọi thay đổi đối với một CVE cụ thể.
Mô tả CVE
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.
