CVE-2026-99137 (GCVE-0-2026-99137)

Vulnerability from cvelistv5 – Published: 2026-10-28 10:34 – Updated: 2026-10-28 10:34
VLAI
Title
cifs: don't update i_size in cifs_do_truncate without a cached handle
Summary
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
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6637 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 110fee6b9bb58a5c50047fc2594d415f741b591e , < 04d020b3d0b58a1b7e116900e4095b96a7f4e11a (git)
Affected: 110fee6b9bb58a5c50047fc2594d415f741b591e , < 88a51743cd8094b76fd910f53f718747c7729cc8 (git)
Affected: 110fee6b9bb58a5c50047fc2594d415f741b591e , < fe39cd9d48f2346605f3746e0cc19e89d5f373eb (git)
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Linux Linux Affected: 6.18
Unaffected: 0 , < 6.18 (semver)
Unaffected: 6.18.59 , ≤ 6.18.* (semver)
Unaffected: 7.2.13 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncifs: don\u0027t 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 \u0027if (!rc)\u0027 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 \u0027if\n(cfile)\u0027, 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."
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncifs: don\u0027t 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 \u0027if (!rc)\u0027 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 \u0027if\n(cfile)\u0027, 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."
          }
        ],
        "id": "CVE-2026-99137",
        "lastModified": "2026-10-28T11:17:33.630",
        "metrics": {},
        "published": "2026-10-28T11:17:33.630",
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      "product_status:known_affected": "186",
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      "source": "Red Hat CSAF VEX",
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      "title": "kernel: cifs: don\u0027t update i_size in cifs_do_truncate without a cached handle",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-99137.json",
      "version": "3"
    }
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}



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