What’s Vulnerable › Vulnerabilities

CVE-2026-98453: smb: client: close handle after create-context parsing failure

• Severity: unknown
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-18 · updated 2026-10-30

Description

In the Linux kernel, the following vulnerability has been resolved: smb: client: close handle after create-context parsing failure SMB2_open() accounts a successful CREATE response as a remote open before parsing its create contexts. If smb2_parse_contexts() rejects malformed context data, SMB2_open() returns without closing the handle, leaving the server-side handle open and num_remote_opens elevated. Close the handle after a post-CREATE context parsing failure so the error path releases the remote resource and balances the open count.

Affected products

• Linux: from 5.10.211 before 5.10.273; from 5.15.150 before 5.15.224; from 6.1.79 before 6.1.191; from 6.6.8 before 6.6.160; from 5.4.277 before 5.5 — fixed in 5.10.273, 5.15.224, 6.1.191, 6.6.160, 5.5

How to fix

Upgrade to a fixed version: Linux 5.10.273, 5.15.224, 6.1.191, 6.6.160. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/007b87f6a7c38959ed79cf7d3fd7b3b4eb5f67fd
• https://git.kernel.org/stable/c/566820af017e81497fb5e9d3ad6e7ffe2828bc8b
• https://git.kernel.org/stable/c/80c67cc71d32ccafc89a29b669243b40d81b930f
• https://git.kernel.org/stable/c/cdb36b09fb1f86d638d0afb44d621ed3f7c1d8eb
• https://git.kernel.org/stable/c/d4c05b5cb0a3132453e36a300d45de44bf6783c4
• https://git.kernel.org/stable/c/eaa97a196a107d4ef8775df2248181624151812e
• https://git.kernel.org/stable/c/ee61f1dc516d97afa79908140d0a8c556c2fe90c
• https://git.kernel.org/stable/c/f09875ff901e933e7b22c913daf51d21e9d93a45

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