CVE-2026-89640High· 7.1▾ TwilightIn the Linux kernel, the following vulnerability has been resolved: cifs: fix loff_t underflow in cifs_remap_file_range() when len == 0 With len == 0 (clone to EOF), the effective length is computed as: len = src_inode->i_size - o…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 39.1 · likelihood 0 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
Exploit-prediction probability, daily snapshots since Sep 12.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
0.2%
— → 6.3
none → medium
— → 7.1
none → high
7.1 → 6.3
high → medium
6.3 → 7.1
medium → high
7.1 → 5.5
high → medium
0.2% → 0.2%
5.5 → 7.1
medium → high
Last analysed / modified upstream
In the Linux kernel, the following vulnerability has been resolved:
cifs: fix loff_t underflow in cifs_remap_file_range() when len == 0
With len == 0 (clone to EOF), the effective length is computed as:
len = src_inode->i_size - off;
If off > i_size, this is a negative loff_t, corrupting the ByteCount in the FSCTL_DUPLICATE_EXTENTS_TO_FILE request and inverting the range in filemap_write_and_wait_range(). The existing off >= i_size check fires only after the ioctl has already been sent.
Snapshot i_size_read() once for both the bounds check and the length calculation, eliminating the TOCTOU and 32-bit torn-read risk. Reject off > src_size with -EINVAL. Treat off == src_size as a no-op, consistent with __generic_remap_file_range_prep().
Linux >= 04b38d601239b4d9be641b412cf4b7456a041c67 < f3d1ae1e6bc4a9f559185b6e7bd2b6375ec2fdd4Linux >= 04b38d601239b4d9be641b412cf4b7456a041c67 < 7f62817fe049b0f3652518c1ba72631ec1e0a322Linux >= 04b38d601239b4d9be641b412cf4b7456a041c67 < b098f5e5858797827666e6cd73033f52fc39b5f6Linux >= 04b38d601239b4d9be641b412cf4b7456a041c67 < c2a0dcb5a7a1516aa6eb6d5cedca6a8e76527028Linux >= 04b38d601239b4d9be641b412cf4b7456a041c67 < b057ca17b656345d04669cb87f2aff9b31d873dbLinux >= 04b38d601239b4d9be641b412cf4b7456a041c67 < 6c322f5cf7476ded7a9a20f7be72462065a03c68Linux 4.5Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Field changes observed since this record was first indexed.
Connected by shared product, vendor, weakness, or advisory.
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