CVE-2026-99137

Full vulnerability record from the local CVENow database.

Description

In the Linux kernel, the following vulnerability has been resolved: cifs: don't update i_size in cifs_do_truncate without a cached handle If find_writable_file() returns null, cifs_file_flush will return 0 without issuing set_file_size, and the outer 'if (!rc)' block will set i_size to 0 before telling the server to truncate. If the cifs_open() then fails, the inode will have size 0, while the server file is unchanged. Move the netfs_resize_file() and cifs_setsize() into the 'if (cfile)', so they only run after a successful set_file_size. In the no-handle else branch, evict stale pages with truncate_inode_pages before the O_TRUNC open to dispose of old cache pages, and let the open response set the i_size.

Severity

Not scored

CVSS score

Not available

Vulnerability status

Received

Source identifier

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

Published

2026-10-28 11:17:33.630000

Last modified

2026-10-28 11:17:33.630000

View original CVE JSON

{
  "id": "CVE-2026-99137",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2026-10-28T11:17:33.630",
  "lastModified": "2026-10-28T11:17:33.630",
  "vulnStatus": "Received",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncifs: don't update i_size in cifs_do_truncate without a cached handle\n\nIf find_writable_file() returns null, cifs_file_flush will return\n0 without issuing set_file_size, and the outer 'if (!rc)' block\nwill set i_size to 0 before telling the server to truncate.  If\nthe cifs_open() then fails, the inode will have size 0, while\nthe server file is unchanged.\n\nMove the netfs_resize_file() and cifs_setsize() into the 'if\n(cfile)', so they only run after a successful set_file_size.\n\nIn the no-handle else branch, evict stale pages with\ntruncate_inode_pages before the O_TRUNC open to dispose of old\ncache pages, and let the open response set the i_size."
    }
  ],
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "programFiles": [
            "fs/smb/client/file.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "110fee6b9bb58a5c50047fc2594d415f741b591e",
              "lessThan": "04d020b3d0b58a1b7e116900e4095b96a7f4e11a",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "110fee6b9bb58a5c50047fc2594d415f741b591e",
              "lessThan": "88a51743cd8094b76fd910f53f718747c7729cc8",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "110fee6b9bb58a5c50047fc2594d415f741b591e",
              "lessThan": "fe39cd9d48f2346605f3746e0cc19e89d5f373eb",
              "versionType": "git",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "programFiles": [
            "fs/smb/client/file.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "6.18",
              "status": "affected"
            },
            {
              "version": "0",
              "lessThan": "6.18",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "6.18.59",
              "lessThanOrEqual": "6.18.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.2.13",
              "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/04d020b3d0b58a1b7e116900e4095b96a7f4e11a",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/88a51743cd8094b76fd910f53f718747c7729cc8",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/fe39cd9d48f2346605f3746e0cc19e89d5f373eb",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ]
}