What’s Vulnerable › Vulnerabilities

CVE-2022-47940

• Severity: high (CVSS 8.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2022-12-23 · updated 2026-06-17
• Weakness: CWE-125

Description

An issue was discovered in ksmbd in the Linux kernel 5.15 through 5.18 before 5.18.18. fs/ksmbd/smb2pdu.c lacks length validation in the non-padding case in smb2_write.

Affected products

• Linux kernel: from 5.15 before 5.15.145; from 5.16 before 5.18.18 — fixed in 5.15.145, 5.18.18

How to fix

Upgrade to a fixed version: Linux kernel 5.15.145, 5.18.18. Check the vendor advisory for mitigations.

References

• http://www.openwall.com/lists/oss-security/2022/12/23/10
• https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.18.18
• https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=158a66b245739e15858de42c0ba60fcf3de9b8e6
• https://github.com/torvalds/linux/commit/158a66b245739e15858de42c0ba60fcf3de9b8e6
• http://www.openwall.com/lists/oss-security/2022/12/23/10
• https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.18.18
• https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=158a66b245739e15858de42c0ba60fcf3de9b8e6
• https://github.com/torvalds/linux/commit/158a66b245739e15858de42c0ba60fcf3de9b8e6

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