CVE-2026-89631Critical· 9.1▾ MidnightIn the Linux kernel, the following vulnerability has been resolved: smb: client: reject a tree connect response whose byte count is too small CIFSTCon() bounds its strnlen() over the byte area with the server's ByteCount minus two, whi…
▾ Midnight zone — Critical, or high with PoC / in-the-wild
impact 50.1 · 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%
5.7 → 9.1
9.1 → 5.7
critical → medium
5.7 → 7
medium → high
0.2% → 0.6%
7 → 8.1
8.1 → 9.1
high → critical
9.1 → 8.1
critical → high
Last analysed / modified upstream
8.1 → 9.1
high → critical
In the Linux kernel, the following vulnerability has been resolved:
smb: client: reject a tree connect response whose byte count is too small
CIFSTCon() bounds its strnlen() over the byte area with the server's ByteCount minus two, which for ByteCount 0 or 1 goes negative as an int and converts to a huge size_t. The later subtraction wraps the __u16 bytes_left, and that is what bounds cifs_strndup_from_utf16(): a bound of up to 65535 against a ~16 KB cifs_req_poolp object runs off the end of the slab object, and the bytes reach userspace through tcon->nativeFileSystem in /proc/fs/cifs/DebugData.
Reject a byte area too small for what the parser consumes. Two bytes is the least it can consume, and no conformant response carries fewer. The new trace point is the 129th smb_eio_trace entry, which __mode(byte) cannot represent, so the attribute goes with it.
Linux >= cc20c031bb067eb3280a1c4b5c42295093e24863 < d837645a719151ed392d4d9cab4571c2753dab12Linux >= cc20c031bb067eb3280a1c4b5c42295093e24863 < 2ae219762ebac929bf6ab3473681f10ed566af08Linux >= cc20c031bb067eb3280a1c4b5c42295093e24863 < 3be89e8039a85fa3b6cd5f9dcc4c1459eb356c2dLinux >= cc20c031bb067eb3280a1c4b5c42295093e24863 < 411e484fe71a7f1028de617447edad9cb6d9d68aLinux >= cc20c031bb067eb3280a1c4b5c42295093e24863 < 65deb18359341141d37dc86fc7853511be3c87a7Linux 2.6.30Refer 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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