FKIE_CVE-2026-64381

Vulnerability from fkie_nvd - Published: 2026-07-25 10:17 - Updated: 2026-07-25 10:17
Severity
Summary
In the Linux kernel, the following vulnerability has been resolved: smb: client: Fix next buffer leak in receive_encrypted_standard() receive_encrypted_standard() allocates next_buffer before checking whether the number of compound PDUs already reached MAX_COMPOUND. If the limit check fails, the function returns immediately and the newly allocated next_buffer is not assigned to server->smallbuf/server->bigbuf, making it leaked. Move the MAX_COMPOUND check before allocating next_buffer.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/07e0ab81df1790afa35732a4e8e07ff831b29008
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/1c6267a1d5cf4c73b656f8181b310cbbb3e4767b
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/297243e365fc9fe2f8e9b7dd535a65d922cd108b
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/67097772df7791c53d608f04bd31c676ccf79b83
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/68fc0b6cc03ca58060c0f36454e169f5fe258974
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9136a08dc29328edd9867f2545e73906ac9df93b
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/927d4805aea0a287d36dd4f826ee24d69a2afee3
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/94e4f672db029414b9888b5137a7559f1febf2d8
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/smb/client/smb2ops.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "94e4f672db029414b9888b5137a7559f1febf2d8",
              "status": "affected",
              "version": "b24df3e30cbf48255db866720fb71f14bf9d2f39",
              "versionType": "git"
            },
            {
              "lessThan": "68fc0b6cc03ca58060c0f36454e169f5fe258974",
              "status": "affected",
              "version": "b24df3e30cbf48255db866720fb71f14bf9d2f39",
              "versionType": "git"
            },
            {
              "lessThan": "07e0ab81df1790afa35732a4e8e07ff831b29008",
              "status": "affected",
              "version": "b24df3e30cbf48255db866720fb71f14bf9d2f39",
              "versionType": "git"
            },
            {
              "lessThan": "9136a08dc29328edd9867f2545e73906ac9df93b",
              "status": "affected",
              "version": "b24df3e30cbf48255db866720fb71f14bf9d2f39",
              "versionType": "git"
            },
            {
              "lessThan": "67097772df7791c53d608f04bd31c676ccf79b83",
              "status": "affected",
              "version": "b24df3e30cbf48255db866720fb71f14bf9d2f39",
              "versionType": "git"
            },
            {
              "lessThan": "297243e365fc9fe2f8e9b7dd535a65d922cd108b",
              "status": "affected",
              "version": "b24df3e30cbf48255db866720fb71f14bf9d2f39",
              "versionType": "git"
            },
            {
              "lessThan": "927d4805aea0a287d36dd4f826ee24d69a2afee3",
              "status": "affected",
              "version": "b24df3e30cbf48255db866720fb71f14bf9d2f39",
              "versionType": "git"
            },
            {
              "lessThan": "1c6267a1d5cf4c73b656f8181b310cbbb3e4767b",
              "status": "affected",
              "version": "b24df3e30cbf48255db866720fb71f14bf9d2f39",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "fs/smb/client/smb2ops.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.19"
            },
            {
              "lessThan": "4.19",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.261",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.212",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.178",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.145",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.96",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.39",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.4",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2-rc1",
              "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\nsmb: client: Fix next buffer leak in receive_encrypted_standard()\n\nreceive_encrypted_standard() allocates next_buffer before checking\nwhether the number of compound PDUs already reached MAX_COMPOUND. If\nthe limit check fails, the function returns immediately and the newly\nallocated next_buffer is not assigned to server-\u003esmallbuf/server-\u003ebigbuf,\nmaking it leaked.\n\nMove the MAX_COMPOUND check before allocating next_buffer."
    }
  ],
  "id": "CVE-2026-64381",
  "lastModified": "2026-07-25T10:17:21.347",
  "metrics": {},
  "published": "2026-07-25T10:17:21.347",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/07e0ab81df1790afa35732a4e8e07ff831b29008"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/1c6267a1d5cf4c73b656f8181b310cbbb3e4767b"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/297243e365fc9fe2f8e9b7dd535a65d922cd108b"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/67097772df7791c53d608f04bd31c676ccf79b83"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/68fc0b6cc03ca58060c0f36454e169f5fe258974"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/9136a08dc29328edd9867f2545e73906ac9df93b"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/927d4805aea0a287d36dd4f826ee24d69a2afee3"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/94e4f672db029414b9888b5137a7559f1febf2d8"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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