{
  "affected": [
    {
      "ranges": [
        {
          "events": [
            {
              "introduced": "4dc0d12474f9d4833c3dd96b73d61e406d3f5dc7"
            },
            {
              "fixed": "d2ab08437e913d9e4dda4dfd0d327446ec8717fc"
            },
            {
              "fixed": "a94309bb99eaf0c6a2ace4927864486d19458eb5"
            },
            {
              "fixed": "5994617e09ee6016c1b094f29d9c85cac944b477"
            },
            {
              "fixed": "9ff145a25c5c8a26b06ef7cf558fb536b18bba6d"
            }
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "type": "GIT"
        }
      ]
    },
    {
      "package": {
        "ecosystem": "Linux",
        "name": "Kernel"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "6.17.0"
            },
            {
              "fixed": "6.18.47"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "6.19.0"
            },
            {
              "fixed": "7.1.11"
            }
          ],
          "type": "ECOSYSTEM"
        },
        {
          "events": [
            {
              "introduced": "7.2.0"
            },
            {
              "fixed": "7.2.1"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ]
    }
  ],
  "database_specific": {
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80818.json"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\niommu/tegra241-cmdqv: Fix CMD_SYNC use-after-free on teardown\n\narm_smmu_impl_remove() is registered as a devres action in\narm_smmu_impl_probe(), before arm_smmu_init_queues() allocates\nsmmu-\u003ecmdq.q.base. On a devres unwind, whether a failed probe or an\nunbind, the queue is freed first and arm_smmu_impl_remove() then runs\ntegra241_cmdqv_remove_vintf(), whose VINTF deinit issues a CMD_SYNC on\nthe freed memory.\n\nObserved during testing with a QEMU hack that makes the VCMDQ fail to\nenable, so the impl reset fails and probe aborts into the devres unwind:\n\n platform NVDA200C:00: tegra241_cmdqv: VINTF0: VCMDQ0/LVCMDQ0: failed to enable, STATUS=0x00000000\n platform NVDA200C:00: tegra241_cmdqv: VINTF0: VCMDQ0/LVCMDQ0: GERRORN=0x0, GERROR=0x4, CONS=0x0\n platform NVDA200C:00: tegra241_cmdqv: VINTF0: VCMDQ0/LVCMDQ0: uncleared error detected, resetting\n arm-smmu-v3 arm-smmu-v3.0.auto: failed to reset impl\n arm-smmu-v3 arm-smmu-v3.0.auto: probe with driver arm-smmu-v3 failed with error -110\n Unable to handle kernel paging request at virtual address ffff8000891e0098\n ...\n Internal error: Oops: 0000000096000047 [#1] SMP\n ...\n Call trace:\n  arm_smmu_cmdq_issue_cmdlist+0x320/0x6fc (P)\n  tegra241_vcmdq_hw_deinit+0x98/0x168\n  tegra241_vintf_hw_deinit+0x5c/0x1b0\n  tegra241_cmdqv_remove_vintf+0x34/0xec\n  tegra241_cmdqv_remove+0x40/0x9c\n  arm_smmu_impl_remove+0x20/0x30\n  devm_action_release+0x14/0x20\n  devres_release_all+0xa8/0x110\n  device_unbind_cleanup+0x18/0x84\n  really_probe+0x1f0/0x29c\n\nDrop the VINTF deinit from tegra241_cmdqv_remove_vintf() so the unwind no\nlonger touches the freed queue. Quiesce the VINTFs earlier instead. Add a\ndevice_disable() impl op and run it from arm_smmu_disable_action() while\nthe CMDQ is still up. That handles a live unbind. A failed reset is already\nhandled because tegra241_vintf_hw_init() deinits the VINTF on its own error\npath. tegra241_cmdqv_remove_vintf() is also used by the iommufd viommu\ndestroy path, so quiesce there too.",
  "id": "CVE-2026-80818",
  "modified": "2026-09-06T03:30:14.844176194Z",
  "published": "2026-09-04T15:13:39.273Z",
  "references": [
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/5994617e09ee6016c1b094f29d9c85cac944b477"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/9ff145a25c5c8a26b06ef7cf558fb536b18bba6d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/a94309bb99eaf0c6a2ace4927864486d19458eb5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d2ab08437e913d9e4dda4dfd0d327446ec8717fc"
    },
    {
      "type": "ADVISORY",
      "url": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/80xxx/CVE-2026-80818.json"
    },
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-80818"
    },
    {
      "type": "PACKAGE",
      "url": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
    }
  ],
  "schema_version": "1.9.0",
  "summary": "iommu/tegra241-cmdqv: Fix CMD_SYNC use-after-free on teardown"
}