CVE-2026-93086

Full vulnerability record from the local CVENow database.

Description

In the Linux kernel, the following vulnerability has been resolved: firmware: arm_scmi: Avoid IDR updates while cleaning channels scmi_cleanup_channels() walks the TX/RX channel IDRs with idr_for_each() to free transport resources and destroy the dedicated transport devices before calling idr_destroy(). The destroy callback removed each entry from the same IDR being walked. That is not needed for this cleanup path, and it is unsafe because idr_for_each() has not advanced its radix-tree iterator while the callback is running. Removing the current entry from the callback can invalidate the iterator state. The callback also cannot be protected by rcu_read_lock(), because scmi_device_destroy() may sleep. Leave IDR teardown to the following idr_destroy() call and keep the callback limited to device destruction.

Severity

Not scored

CVSS score

Not available

Vulnerability status

Received

Source identifier

416baaa9-dc9f-4396-8d5f-8c081fb06d67

Published

2026-09-17 17:18:02.713000

Last modified

2026-10-30 13:20:56.677000

View original CVE JSON

{
  "id": "CVE-2026-93086",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2026-09-17T17:18:02.713",
  "lastModified": "2026-10-30T13:20:56.677",
  "vulnStatus": "Received",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfirmware: arm_scmi: Avoid IDR updates while cleaning channels\n\nscmi_cleanup_channels() walks the TX/RX channel IDRs with\nidr_for_each() to free transport resources and destroy the dedicated\ntransport devices before calling idr_destroy().\n\nThe destroy callback removed each entry from the same IDR being walked.\nThat is not needed for this cleanup path, and it is unsafe because\nidr_for_each() has not advanced its radix-tree iterator while the\ncallback is running. Removing the current entry from the callback can\ninvalidate the iterator state. The callback also cannot be protected by\nrcu_read_lock(), because scmi_device_destroy() may sleep.\n\nLeave IDR teardown to the following idr_destroy() call and keep the\ncallback limited to device destruction."
    }
  ],
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "programFiles": [
            "drivers/firmware/arm_scmi/driver.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "22f7f35fd71b597a5d916e41d7646be6ee530c86",
              "lessThan": "f50698c617350a6e2064dffd6cff3f391e142f55",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "05a2801d8b90c1b5159618d4bd3a3c65d60f3ff1",
              "lessThan": "aed24a3c63920539e9de7fbfe7929a2e7c888cd2",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "05a2801d8b90c1b5159618d4bd3a3c65d60f3ff1",
              "lessThan": "431c6b872ba7fedcc5a3afb0ec3517db4d95d088",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "05a2801d8b90c1b5159618d4bd3a3c65d60f3ff1",
              "lessThan": "54e5a4f7d83db4552d963d0785be32d9df680dcd",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "05a2801d8b90c1b5159618d4bd3a3c65d60f3ff1",
              "lessThan": "bab26acebe55e8ad3ab545abda72faa7ca28c477",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "05a2801d8b90c1b5159618d4bd3a3c65d60f3ff1",
              "lessThan": "c38b1e19485aaa820e52cfe162525a8af67563da",
              "versionType": "git",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "programFiles": [
            "drivers/firmware/arm_scmi/driver.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "6.3",
              "status": "affected"
            },
            {
              "version": "0",
              "lessThan": "6.3",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.6.157",
              "lessThanOrEqual": "6.6.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.12.110",
              "lessThanOrEqual": "6.12.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.18.52",
              "lessThanOrEqual": "6.18.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.2.6",
              "lessThanOrEqual": "7.2.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.3",
              "lessThanOrEqual": "*",
              "versionType": "original_commit_for_fix",
              "status": "unaffected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {},
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/431c6b872ba7fedcc5a3afb0ec3517db4d95d088",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/54e5a4f7d83db4552d963d0785be32d9df680dcd",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/aed24a3c63920539e9de7fbfe7929a2e7c888cd2",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/bab26acebe55e8ad3ab545abda72faa7ca28c477",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/c38b1e19485aaa820e52cfe162525a8af67563da",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/f50698c617350a6e2064dffd6cff3f391e142f55",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ]
}