{
  "affected": [
    {
      "ecosystem_specific": {
        "urgency": "not yet assigned"
      },
      "package": {
        "ecosystem": "Debian:14",
        "name": "linux"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "7.1.12-1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "details": "In the Linux kernel, the following vulnerability has been resolved:  iommu/tegra241-cmdqv: Fix CMD_SYNC use-after-free on teardown  arm_smmu_impl_remove() is registered as a devres action in arm_smmu_impl_probe(), before arm_smmu_init_queues() allocates smmu-\u003ecmdq.q.base. On a devres unwind, whether a failed probe or an unbind, the queue is freed first and arm_smmu_impl_remove() then runs tegra241_cmdqv_remove_vintf(), whose VINTF deinit issues a CMD_SYNC on the freed memory.  Observed during testing with a QEMU hack that makes the VCMDQ fail to enable, so the impl reset fails and probe aborts into the devres unwind:   platform NVDA200C:00: tegra241_cmdqv: VINTF0: VCMDQ0/LVCMDQ0: failed to enable, STATUS=0x00000000  platform NVDA200C:00: tegra241_cmdqv: VINTF0: VCMDQ0/LVCMDQ0: GERRORN=0x0, GERROR=0x4, CONS=0x0  platform NVDA200C:00: tegra241_cmdqv: VINTF0: VCMDQ0/LVCMDQ0: uncleared error detected, resetting  arm-smmu-v3 arm-smmu-v3.0.auto: failed to reset impl  arm-smmu-v3 arm-smmu-v3.0.auto: probe with driver arm-smmu-v3 failed with error -110  Unable to handle kernel paging request at virtual address ffff8000891e0098  ...  Internal error: Oops: 0000000096000047 [#1] SMP  ...  Call trace:   arm_smmu_cmdq_issue_cmdlist+0x320/0x6fc (P)   tegra241_vcmdq_hw_deinit+0x98/0x168   tegra241_vintf_hw_deinit+0x5c/0x1b0   tegra241_cmdqv_remove_vintf+0x34/0xec   tegra241_cmdqv_remove+0x40/0x9c   arm_smmu_impl_remove+0x20/0x30   devm_action_release+0x14/0x20   devres_release_all+0xa8/0x110   device_unbind_cleanup+0x18/0x84   really_probe+0x1f0/0x29c  Drop the VINTF deinit from tegra241_cmdqv_remove_vintf() so the unwind no longer touches the freed queue. Quiesce the VINTFs earlier instead. Add a device_disable() impl op and run it from arm_smmu_disable_action() while the CMDQ is still up. That handles a live unbind. A failed reset is already handled because tegra241_vintf_hw_init() deinits the VINTF on its own error path. tegra241_cmdqv_remove_vintf() is also used by the iommufd viommu destroy path, so quiesce there too.",
  "id": "DEBIAN-CVE-2026-80818",
  "modified": "2026-09-14T16:47:38.838177119Z",
  "published": "2026-09-04T16:18:09.453Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://security-tracker.debian.org/tracker/CVE-2026-80818"
    }
  ],
  "upstream": [
    "CVE-2026-80818"
  ]
}