CVE-2026-90155

{
  "id": "CVE-2026-90155",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2026-09-17T17:17:08.607",
  "lastModified": "2026-10-30T13:20:44.020",
  "vulnStatus": "Received",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: detach blocked lock requests before freeing\n\nA file_lock retained by ksmbd for byte-range lock bookkeeping can still\nbe part of the VFS blocked-request graph. In particular, the VFS can\nchain a new waiter below an already blocked request through\nflc_blocked_requests. The ksmbd_file reference count does not cover that\ngraph.\n\nBoth __ksmbd_close_fd() and the cross-request unlock path free these\nretained file_lock objects directly. If a dependent waiter is still\nattached, locks_release_private() hits\nBUG_ON(!list_empty(&flc->flc_blocked_requests)). The same lifetime\nmismatch can leave a freed ksmbd_lock reachable through its request-local\nllist.\n\nDetach the file_lock from the blocked-request graph before freeing it in\nthe close, cross-request unlock, and rollback paths. locks_delete_block()\nalso wakes requests chained below the object. Remove llist when a\ncompleted lock is published so a globally visible ksmbd_lock no longer\npoints into the submitting worker's stack."
    }
  ],
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "programFiles": [
            "fs/smb/server/smb2pdu.c",
            "fs/smb/server/vfs_cache.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "d63528eb0d43c4796c42aad56889dec12cf4e122",
              "lessThan": "4e8b69c06bd6583ec11abef4fae50c2c8d5f3679",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "d63528eb0d43c4796c42aad56889dec12cf4e122",
              "lessThan": "d20d3f6ad8b0b6f4e1bb32cdf7eca251962e8f04",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "d63528eb0d43c4796c42aad56889dec12cf4e122",
              "lessThan": "d31db79cfaa9fce6649772ad279779473ba8aef9",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "d63528eb0d43c4796c42aad56889dec12cf4e122",
              "lessThan": "f77d2accafca529e0ea3f979eb6e6cf1dac05c90",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "d63528eb0d43c4796c42aad56889dec12cf4e122",
              "lessThan": "514a0b2bc949963497e66cacd433f65dc768a71d",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "d63528eb0d43c4796c42aad56889dec12cf4e122",
              "lessThan": "215e8816b1ac25176d911abb8704390413ccee4b",
              "versionType": "git",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "programFiles": [
            "fs/smb/server/smb2pdu.c",
            "fs/smb/server/vfs_cache.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "5.15",
              "status": "affected"
            },
            {
              "version": "0",
              "lessThan": "5.15",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.1.191",
              "lessThanOrEqual": "6.1.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.6.160",
              "lessThanOrEqual": "6.6.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.12.114",
              "lessThanOrEqual": "6.12.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.18.57",
              "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/215e8816b1ac25176d911abb8704390413ccee4b",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/4e8b69c06bd6583ec11abef4fae50c2c8d5f3679",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/514a0b2bc949963497e66cacd433f65dc768a71d",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/d20d3f6ad8b0b6f4e1bb32cdf7eca251962e8f04",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/d31db79cfaa9fce6649772ad279779473ba8aef9",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/f77d2accafca529e0ea3f979eb6e6cf1dac05c90",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ]
}