CVE-2026-90427

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-90427", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.814Z", "datePublished": "2026-09-17T16:09:49.121Z", "dateUpdated": "2026-10-21T12:51:38.034Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-21T12:51:38.034Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\niommu/tegra241-cmdqv: Don't fall back to a freed smmu after devm_krealloc()\n\n__tegra241_cmdqv_probe() uses devm_krealloc() to grow @smmu into the larger\ntegra241_cmdqv, which frees the original @smmu once it relocates. A failure\nafter that returned NULL, and the caller then dereferenced the freed @smmu\non its fallback path.\n\nReturn an int and take @smmu by reference instead, then update *smmu to the\nreallocated pointer after devm_krealloc() succeeds, so the caller and its\nfallback path both use the live @smmu rather than the freed original."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 7.4, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:L - The UAF is reached from arm_smmu_device_probe() \u2192 arm_smmu_impl_probe() \u2192 tegra241_cmdqv_probe() \u2192 __tegra241_cmdqv_probe() when ACPI IORT (acpi_iort_init()/iort_add_platform_device(\"arm-smmu-v3\")) or DT nvidia,tegra264-smmu binds the SMMU. No protocol message supplies the stale pointer; it is a local devm_krealloc() lifetime bug.\nAC:H - out_fallback uses the freed @smmu only if a relocating devm_krealloc() is followed by kzalloc_objs(cmdqv->vintfs) or request_threaded_irq() failing. arm_smmu_driver sets suppress_bind_attrs, CONFIG_ARM_SMMU_V3=y, and this probe never returns -EPROBE_DEFER, so a local attacker cannot re-enter it or reliably force those GFP_KERNEL/IRQ failures.\nPR:N - arm_smmu_device_probe() has no capable() check; tegra241_cmdqv_probe() runs from the platform .probe in kernel_init once IORT creates the arm-smmu-v3 device or DT matches nvidia,tegra264-smmu. No OS account or user-namespace capability is required to be on that path.\nUI:N - tegra241_cmdqv_probe()\u2019s out_fallback dereference of the freed @smmu runs inside arm_smmu_device_probe() during automatic platform bind; no victim must mount a filesystem, open a device node, or load a module by hand.\nS:U - The use-after-free is of the host kernel arm_smmu_device that devm_krealloc() freed in __tegra241_cmdqv_probe(); out_fallback\u2019s smmu->options write and the rest of arm_smmu_device_probe() stay in that kernel. This is not leftover SMMU translation tables or a guest/DMA walk of attacker-controlled IOMMU page tables.\nC:H - After a relocating devm_krealloc(), tegra241_cmdqv_probe() returns ERR_PTR(-ENODEV) and arm_smmu_impl_probe() hands the freed @smmu back to arm_smmu_device_probe(). That use-after-free of the SMMU object can be reclaimed and, per kernel UAF guidance, enables arbitrary kernel memory disclosure.\nI:H - out_fallback writes smmu->options through the freed pointer, then arm_smmu_device_probe() continues with arm_smmu_device_hw_probe(), arm_smmu_init_structures(), and iommu_device_register() on the same dangling arm_smmu_device, a write-after-free that yields heap-spray write and control-flow hijack primitives.\nA:H - out_fallback dereferences smmu->impl_dev and later SMMU probe/runtime uses the freed arm_smmu_device; that use-after-free oopses or panics the kernel even when not turned into a full exploit."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/iommu/arm/arm-smmu-v3/tegra241-cmdqv.c"], "versions": [{"version": "918eb5c856f6ce4cf93b4b38e4b5e156905c5943", "lessThan": "ea2edb27ef2648d8687cd0fc3ec3ba1793436e7e", "status": "affected", "versionType": "git"}, {"version": "918eb5c856f6ce4cf93b4b38e4b5e156905c5943", "lessThan": "268cbe3a36ae57a2ec09601f343b92f6f092d505", "status": "affected", "versionType": "git"}, {"version": "918eb5c856f6ce4cf93b4b38e4b5e156905c5943", "lessThan": "86197679b293f0601c3331d545f99a70a7780aa9", "status": "affected", "versionType": "git"}, {"version": "918eb5c856f6ce4cf93b4b38e4b5e156905c5943", "lessThan": "d4d05f55e9da646ec03adfa77260eb46f4163749", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/iommu/arm/arm-smmu-v3/tegra241-cmdqv.c"], "versions": [{"version": "6.12", "status": "affected"}, {"version": "0", "lessThan": "6.12", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.114", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.57", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2.6", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.3", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.12", "versionEndExcluding": "6.12.114"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.12", "versionEndExcluding": "6.18.57"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.12", "versionEndExcluding": "7.2.6"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.12", "versionEndExcluding": "7.3"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/ea2edb27ef2648d8687cd0fc3ec3ba1793436e7e"}, {"url": "https://git.kernel.org/stable/c/268cbe3a36ae57a2ec09601f343b92f6f092d505"}, {"url": "https://git.kernel.org/stable/c/86197679b293f0601c3331d545f99a70a7780aa9"}, {"url": "https://git.kernel.org/stable/c/d4d05f55e9da646ec03adfa77260eb46f4163749"}], "title": "iommu/tegra241-cmdqv: Don't fall back to a freed smmu after devm_krealloc()", "x_generator": {"engine": "bippy-1.2.0"}}}}

{}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/iommu/arm/arm-smmu-v3/tegra241-cmdqv.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "ea2edb27ef2648d8687cd0fc3ec3ba1793436e7e", "status": "affected", "version": "918eb5c856f6ce4cf93b4b38e4b5e156905c5943", "versionType": "git"}, {"lessThan": "268cbe3a36ae57a2ec09601f343b92f6f092d505", "status": "affected", "version": "918eb5c856f6ce4cf93b4b38e4b5e156905c5943", "versionType": "git"}, {"lessThan": "86197679b293f0601c3331d545f99a70a7780aa9", "status": "affected", "version": "918eb5c856f6ce4cf93b4b38e4b5e156905c5943", "versionType": "git"}, {"lessThan": "d4d05f55e9da646ec03adfa77260eb46f4163749", "status": "affected", "version": "918eb5c856f6ce4cf93b4b38e4b5e156905c5943", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/iommu/arm/arm-smmu-v3/tegra241-cmdqv.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "6.12"}, {"lessThan": "6.12", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.114", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.57", "versionType": "semver"}, {"lessThanOrEqual": "7.2.*", "status": "unaffected", "version": "7.2.6", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.3", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\niommu/tegra241-cmdqv: Don't fall back to a freed smmu after devm_krealloc()\n\n__tegra241_cmdqv_probe() uses devm_krealloc() to grow @smmu into the larger\ntegra241_cmdqv, which frees the original @smmu once it relocates. A failure\nafter that returned NULL, and the caller then dereferenced the freed @smmu\non its fallback path.\n\nReturn an int and take @smmu by reference instead, then update *smmu to the\nreallocated pointer after devm_krealloc() succeeds, so the caller and its\nfallback path both use the live @smmu rather than the freed original."}], "id": "CVE-2026-90427", "lastModified": "2026-10-21T13:20:56.183", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.4, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.4, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-09-17T17:17:47.500", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/268cbe3a36ae57a2ec09601f343b92f6f092d505"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/86197679b293f0601c3331d545f99a70a7780aa9"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/d4d05f55e9da646ec03adfa77260eb46f4163749"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/ea2edb27ef2648d8687cd0fc3ec3ba1793436e7e"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[918eb5c856f6ce4cf93b4b38e4b5e156905c5943,86197679b293f0601c3331d545f99a70a7780aa9)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[918eb5c856f6ce4cf93b4b38e4b5e156905c5943,d4d05f55e9da646ec03adfa77260eb46f4163749)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "6.12"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,6.12)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.2.6,7.3.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.3-rc1,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-09-19T06:00:09.682570+00:00", "updated": "2026-09-20T00:30:16.209622+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"], "weaknesses": ["CWE-416"]}