CVE-2026-74566

Full vulnerability record from the local CVENow database.

Description

In the Linux kernel, the following vulnerability has been resolved: keys: make keyring key-chunk byte order agree with keyring_diff_objects() keyring_get_key_chunk() loads description bytes into the index chunk low address first, while keyring_diff_objects() numbers the first differing bit from the low end and folds the absolute byte index into the level without removing the inline-prefix offset the level already carries. The two disagree on byte order and bit position, so the array can be told two keys first differ at a bit that does not differ in the chunk the walker uses, letting crafted descriptions collide into one node. Load the chunk in the order keyring_diff_objects() assumes and drop the inline-prefix length when folding the byte index into the level. This only changes the in-memory ordering used to place keys within a keyring; add, search and read of non-colliding keys are unaffected.

Severity

Not scored

CVSS score

Not available

Vulnerability status

Received

Source identifier

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

Published

2026-08-15 13:18:02.120000

Last modified

2026-11-06 17:19:50.980000

View original CVE JSON

{
  "id": "CVE-2026-74566",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2026-08-15T13:18:02.120",
  "lastModified": "2026-11-06T17:19:50.980",
  "vulnStatus": "Received",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nkeys: make keyring key-chunk byte order agree with keyring_diff_objects()\n\nkeyring_get_key_chunk() loads description bytes into the index chunk low\naddress first, while keyring_diff_objects() numbers the first differing\nbit from the low end and folds the absolute byte index into the level\nwithout removing the inline-prefix offset the level already carries.\nThe two disagree on byte order and bit position, so the array can be\ntold two keys first differ at a bit that does not differ in the chunk\nthe walker uses, letting crafted descriptions collide into one node.\n\nLoad the chunk in the order keyring_diff_objects() assumes and drop the\ninline-prefix length when folding the byte index into the level.  This\nonly changes the in-memory ordering used to place keys within a keyring;\nadd, search and read of non-colliding keys are unaffected."
    }
  ],
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "programFiles": [
            "security/keys/keyring.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "f771fde82051976a6fc0fd570f8b86de4a92124b",
              "lessThan": "414bcf37d81ce9b3823aabc06b04c97fdcbe489b",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "f771fde82051976a6fc0fd570f8b86de4a92124b",
              "lessThan": "abe43c661efb753d5ee35ad8ace4bbb16fa9afd0",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "f771fde82051976a6fc0fd570f8b86de4a92124b",
              "lessThan": "f81920917074e3c4ad4fba06fe8c56738d010606",
              "versionType": "git",
              "status": "affected"
            },
            {
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              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "f771fde82051976a6fc0fd570f8b86de4a92124b",
              "lessThan": "7269df3e7fcfa308e6a456305162f7788747bdbd",
              "versionType": "git",
              "status": "affected"
            },
            {
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              "lessThan": "3d9f16c0b643ceac305526b2e2fe25c2c6166926",
              "versionType": "git",
              "status": "affected"
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            {
              "version": "f771fde82051976a6fc0fd570f8b86de4a92124b",
              "lessThan": "7e5397a3fed0dee7779bd084bec3c0584db3c930",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "f771fde82051976a6fc0fd570f8b86de4a92124b",
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              "versionType": "git",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "programFiles": [
            "security/keys/keyring.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "5.3",
              "status": "affected"
            },
            {
              "version": "0",
              "lessThan": "5.3",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "5.10.265",
              "lessThanOrEqual": "5.10.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "5.15.216",
              "lessThanOrEqual": "5.15.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.1.183",
              "lessThanOrEqual": "6.1.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.6.151",
              "lessThanOrEqual": "6.6.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.12.103",
              "lessThanOrEqual": "6.12.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.18.44",
              "lessThanOrEqual": "6.18.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.1.8",
              "lessThanOrEqual": "7.1.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.2",
              "lessThanOrEqual": "*",
              "versionType": "original_commit_for_fix",
              "status": "unaffected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "timestamp": "2026-11-06T16:59:38.524591Z",
          "id": "CVE-2026-74566",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "version": "2.0.3"
        }
      }
    ]
  },
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/3d9f16c0b643ceac305526b2e2fe25c2c6166926",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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    {
      "url": "https://git.kernel.org/stable/c/414bcf37d81ce9b3823aabc06b04c97fdcbe489b",
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    {
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      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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    {
      "url": "https://git.kernel.org/stable/c/bd0f976ef89dce6db458bf75bc2cf51127becc41",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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    {
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      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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}