CVE-2026-90427 (GCVE-0-2026-90427)

Vulnerability from cvelistv5 – Published: 2026-09-17 16:09 – Updated: 2026-10-21 12:51
VLAI
Title
iommu/tegra241-cmdqv: Don't fall back to a freed smmu after devm_krealloc()
Summary
In the Linux kernel, the following vulnerability has been resolved: iommu/tegra241-cmdqv: Don't fall back to a freed smmu after devm_krealloc() __tegra241_cmdqv_probe() uses devm_krealloc() to grow @smmu into the larger tegra241_cmdqv, which frees the original @smmu once it relocates. A failure after that returned NULL, and the caller then dereferenced the freed @smmu on its fallback path. Return an int and take @smmu by reference instead, then update *smmu to the reallocated pointer after devm_krealloc() succeeds, so the caller and its fallback path both use the live @smmu rather than the freed original.
Severity
7.4 (High)
CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6641 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 918eb5c856f6ce4cf93b4b38e4b5e156905c5943 , < ea2edb27ef2648d8687cd0fc3ec3ba1793436e7e (git)
Affected: 918eb5c856f6ce4cf93b4b38e4b5e156905c5943 , < 268cbe3a36ae57a2ec09601f343b92f6f092d505 (git)
Affected: 918eb5c856f6ce4cf93b4b38e4b5e156905c5943 , < 86197679b293f0601c3331d545f99a70a7780aa9 (git)
Affected: 918eb5c856f6ce4cf93b4b38e4b5e156905c5943 , < d4d05f55e9da646ec03adfa77260eb46f4163749 (git)
guessed Create a notification for this product.
Linux Linux Affected: 6.12
Unaffected: 0 , < 6.12 (semver)
Unaffected: 6.12.114 , ≤ 6.12.* (semver)
Unaffected: 6.18.57 , ≤ 6.18.* (semver)
Unaffected: 7.2.6 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
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{
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/iommu/arm/arm-smmu-v3/tegra241-cmdqv.c"
          ],
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          "versions": [
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              "version": "6.12"
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              "version": "0",
              "versionType": "semver"
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              "version": "6.12.114",
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              "version": "6.18.57",
              "versionType": "semver"
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              "versionType": "semver"
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                  "versionStartIncluding": "6.12",
                  "vulnerable": true
                },
                {
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                  "versionEndExcluding": "6.18.57",
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                  "vulnerable": true
                },
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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              "negate": false,
              "operator": "OR"
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\niommu/tegra241-cmdqv: Don\u0027t 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": {
            "baseScore": 7.4,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "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-\u003evintfs) 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-\u003eoptions 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-\u003eoptions 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-\u003eimpl_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."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-21T12:51:38.034Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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          "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\u0027t fall back to a freed smmu after devm_krealloc()",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-90427",
    "datePublished": "2026-09-17T16:09:49.121Z",
    "dateReserved": "2026-09-11T19:38:34.814Z",
    "dateUpdated": "2026-10-21T12:51:38.034Z",
    "state": "PUBLISHED"
  },
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      "date": "2026-11-14",
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                "product": "Linux",
                "programFiles": [
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\niommu/tegra241-cmdqv: Don\u0027t 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": {
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                "attackComplexity": "HIGH",
                "attackVector": "LOCAL",
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                "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"
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              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
              "type": "Secondary"
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        "published": "2026-09-17T17:17:47.500",
        "references": [
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            "url": "https://git.kernel.org/stable/c/268cbe3a36ae57a2ec09601f343b92f6f092d505"
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        "vulnStatus": "Received"
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      "aggregate_severity": "Moderate",
      "current_release_date": "2026-11-06T01:43:42+00:00",
      "cve": "CVE-2026-90427",
      "id": "CVE-2026-90427",
      "initial_release_date": "2026-09-17T00:00:00+00:00",
      "product_status:known_affected": "110",
      "product_status:known_not_affected": "93",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: iommu/tegra241-cmdqv: Don\u0027t fall back to a freed smmu after devm_krealloc()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-90427.json",
      "version": "3"
    }
  }
}



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