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CVE-2026-80818 (GCVE-0-2026-80818)

Vulnerability from cvelistv5 – Published: 2026-09-04 15:13 – Updated: 2026-09-04 15:13
VLAI
Title
iommu/tegra241-cmdqv: Fix CMD_SYNC use-after-free on teardown
Summary
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->cmdq.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.
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 4dc0d12474f9d4833c3dd96b73d61e406d3f5dc7 , < d2ab08437e913d9e4dda4dfd0d327446ec8717fc (git)
Affected: 4dc0d12474f9d4833c3dd96b73d61e406d3f5dc7 , < a94309bb99eaf0c6a2ace4927864486d19458eb5 (git)
Affected: 4dc0d12474f9d4833c3dd96b73d61e406d3f5dc7 , < 5994617e09ee6016c1b094f29d9c85cac944b477 (git)
Affected: 4dc0d12474f9d4833c3dd96b73d61e406d3f5dc7 , < 9ff145a25c5c8a26b06ef7cf558fb536b18bba6d (git)
guessed Create a notification for this product.
Linux Linux Affected: 6.17
Unaffected: 0 , < 6.17 (semver)
Unaffected: 6.18.47 , ≤ 6.18.* (semver)
Unaffected: 7.1.11 , ≤ 7.1.* (semver)
Unaffected: 7.2.1 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
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            "value": "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",
        "lastModified": "2026-09-04T16:18:09.453",
        "metrics": {},
        "published": "2026-09-04T16:18:09.453",
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        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
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      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-08T17:16:57Z",
      "cve": "CVE-2026-80818",
      "id": "CVE-2026-80818",
      "initial_release_date": "2026-09-05T00:26:46Z",
      "product_status:known_not_affected": "353",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-80818",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-80818.json",
      "version": "4"
    }
  }
}



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