CVE-2026-80818iommu/tegra241-cmdqv: Fix CMD_SYNC use-after-free on teardown
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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.
- CVSS
- Not yet scored
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Sep 4, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 4dc0d12474f9d4833c3dd96b73d61e406d3f5dc7 before d2ab08437e913d9e4dda4dfd0d327446ec8717fc; from 4dc0d12474f9d4833c3dd96b73d61e406d3f5dc7 before a94309bb99eaf0c6a2ace4927864486d19458eb5; from 4dc0d12474f9d4833c3dd96b73d61e406d3f5dc7 before 5994617e09ee6016c1b094f29d9c85cac944b477; from 4dc0d12474f9d4833c3dd96b73d61e406d3f5dc7 before 9ff145a25c5c8a26b06ef7cf558fb536b18bba6d | CNA record |
References
- https://git.kernel.org/stable/c/d2ab08437e913d9e4dda4dfd0d327446ec8717fc
- https://git.kernel.org/stable/c/a94309bb99eaf0c6a2ace4927864486d19458eb5
- https://git.kernel.org/stable/c/5994617e09ee6016c1b094f29d9c85cac944b477
- https://git.kernel.org/stable/c/9ff145a25c5c8a26b06ef7cf558fb536b18bba6d
The CVE record on cve.org NVD's entry
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