{"id":"CVE-2025-37837","title":"iommu/tegra241-cmdqv: Fix warnings due to dmam_free_coherent()","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\niommu/tegra241-cmdqv: Fix warnings due to dmam_free_coherent()\n\nTwo WARNINGs are observed when SMMU driver rolls back upon failure:\n arm-smmu-v3.9.auto: Failed to regis…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= 483e0bd8883a40fd3dd3193997a4014337698d72 < e5dd974d6e00704553308ef1a88659f8dcfb39d4","Linux >= 483e0bd8883a40fd3dd3193997a4014337698d72 < 5584dbf393df509159813645a487b1ef76557722","Linux >= 483e0bd8883a40fd3dd3193997a4014337698d72 < e38ed6908080047d8fa1763d1da86b584f9eb55b","Linux >= 483e0bd8883a40fd3dd3193997a4014337698d72 < 767e22001dfce64cc03b7def1562338591ab6031","Linux 6.12"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-11-05T20:41:52.529850Z"},"published":"2025-05-09","updated":"2026-11-05","sourceUpdated":"2026-11-05T20:52:04.562Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2025-37837","references":[{"url":"https://git.kernel.org/stable/c/e5dd974d6e00704553308ef1a88659f8dcfb39d4"},{"url":"https://git.kernel.org/stable/c/5584dbf393df509159813645a487b1ef76557722"},{"url":"https://git.kernel.org/stable/c/e38ed6908080047d8fa1763d1da86b584f9eb55b"},{"url":"https://git.kernel.org/stable/c/767e22001dfce64cc03b7def1562338591ab6031"}],"tags":["cve.org"],"epss":0.00281,"epssPercentile":0.20739,"ingestedAt":"2026-11-05T22:38:31.882Z","slug":"CVE-2025-37837","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\niommu/tegra241-cmdqv: Fix warnings due to dmam_free_coherent()\n\nTwo WARNINGs are observed when SMMU driver rolls back upon failure:\n arm-smmu-v3.9.auto: Failed to register iommu\n arm-smmu-v3.9.auto: probe with driver arm-smmu-v3 failed with error -22\n ------------[ cut here ]------------\n WARNING: CPU: 5 PID: 1 at kernel/dma/mapping.c:74 dmam_free_coherent+0xc0/0xd8\n Call trace:\n  dmam_free_coherent+0xc0/0xd8 (P)\n  tegra241_vintf_free_lvcmdq+0x74/0x188\n  tegra241_cmdqv_remove_vintf+0x60/0x148\n  tegra241_cmdqv_remove+0x48/0xc8\n  arm_smmu_impl_remove+0x28/0x60\n  devm_action_release+0x1c/0x40\n ------------[ cut here ]------------\n 128 pages are still in use!\n WARNING: CPU: 16 PID: 1 at mm/page_alloc.c:6902 free_contig_range+0x18c/0x1c8\n Call trace:\n  free_contig_range+0x18c/0x1c8 (P)\n  cma_release+0x154/0x2f0\n  dma_free_contiguous+0x38/0xa0\n  dma_direct_free+0x10c/0x248\n  dma_free_attrs+0x100/0x290\n  dmam_free_coherent+0x78/0xd8\n  tegra241_vintf_free_lvcmdq+0x74/0x160\n  tegra241_cmdqv_remove+0x98/0x198\n  arm_smmu_impl_remove+0x28/0x60\n  devm_action_release+0x1c/0x40\n\nThis is because the LVCMDQ queue memory are managed by devres, while that\ndmam_free_coherent() is called in the context of devm_action_release().\n\nJason pointed out that \"arm_smmu_impl_probe() has mis-ordered the devres\ncallbacks if ops->device_remove() is going to be manually freeing things\nthat probe allocated\":\nhttps://lore.kernel.org/linux-iommu/20250407174408.GB1722458@nvidia.com/\n\nIn fact, tegra241_cmdqv_init_structures() only allocates memory resources\nwhich means any failure that it generates would be similar to -ENOMEM, so\nthere is no point in having that \"falling back to standard SMMU\" routine,\nas the standard SMMU would likely fail to allocate memory too.\n\nRemove the unwind part in tegra241_cmdqv_init_structures(), and return a\nproper error code to ask SMMU driver to call tegra241_cmdqv_remove() via\nimpl_ops->device_remove(). Then, drop tegra241_vintf_free_lvcmdq() since\ndevres will take care of that.\n\n## Affected\n\n- `Linux >= 483e0bd8883a40fd3dd3193997a4014337698d72 < e5dd974d6e00704553308ef1a88659f8dcfb39d4`\n- `Linux >= 483e0bd8883a40fd3dd3193997a4014337698d72 < 5584dbf393df509159813645a487b1ef76557722`\n- `Linux >= 483e0bd8883a40fd3dd3193997a4014337698d72 < e38ed6908080047d8fa1763d1da86b584f9eb55b`\n- `Linux >= 483e0bd8883a40fd3dd3193997a4014337698d72 < 767e22001dfce64cc03b7def1562338591ab6031`\n- `Linux 6.12`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0.1,"exploitation":0,"ransomware":0},"changes":[]}