CVE-2026-89632High· 8.2▾ TwilightIn the Linux kernel, the following vulnerability has been resolved: smb: client: fix use-before-check of ReparseDataLength in reparse_buf_ptr() reparse_buf_ptr() reads buf->ReparseDataLength before checking that count covers the full f…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 45.1 · likelihood 0.1 · 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
— → 8.2
none → high
8.2 → 6.3
high → medium
6.3 → 8.2
medium → high
8.2 → 6.3
high → medium
6.3 → 7
medium → high
7 → 8.2
Last analysed / modified upstream
0.2% → 0.6%
In the Linux kernel, the following vulnerability has been resolved:
smb: client: fix use-before-check of ReparseDataLength in reparse_buf_ptr()
reparse_buf_ptr() reads buf->ReparseDataLength before checking that count covers the full fixed header:
buf = (struct reparse_data_buffer *)((u8 *)io + off);
len = sizeof(*buf); /* 8 bytes */
rdlen = le16_to_cpu(buf->ReparseDataLength); /* offset 4, 2 bytes */
if (count < len || count < rdlen + len) /* check comes after */
struct reparse_data_buffer has ReparseDataLength at offset 4. If a server returns OutputCount < 6, the read at offset 4-5 reaches past the end of the received data. The off+count bounds against iov_len were already validated, but that does not protect against count being smaller than sizeof(*buf).
Split the check: verify count >= sizeof(*buf) before reading ReparseDataLength, then verify count covers the data region.
Linux >= a158bb66b1373866d9fd5997565a58a573085539 < b70bc592afd19732e2e4563300ebe8f974280365Linux >= 67ec9949b0dfe78c99e110dd975eb7dc5645630c < 711cf71300d7992f450600df8864917d3538679fLinux >= 67ec9949b0dfe78c99e110dd975eb7dc5645630c < 05f78e6cf34ea3a285053bd5999e08e8ac298bd5Linux >= 6.6.32 < 6.6.160Linux 6.8Refer 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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