What’s Vulnerable › Vulnerabilities

CVE-2022-47939

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 49.3% 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-416

Description

An issue was discovered in ksmbd in the Linux kernel 5.15 through 5.19 before 5.19.2. fs/ksmbd/smb2pdu.c has a use-after-free and OOPS for SMB2_TREE_DISCONNECT.

Affected products

• Linux kernel: from 5.15 before 5.15.61; from 5.16 before 5.18.18; from 5.19 before 5.19.2 — fixed in 5.15.61, 5.18.18, 5.19.2

How to fix

Upgrade to a fixed version: Linux kernel 5.15.61, 5.18.18, 5.19.2. 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-5.19.2
• https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=cf6531d98190fa2cf92a6d8bbc8af0a4740a223c
• https://github.com/torvalds/linux/commit/cf6531d98190fa2cf92a6d8bbc8af0a4740a223c
• https://www.secpod.com/blog/zero-day-server-message-block-smb-server-in-linux-kernel-5-15-has-a-critical-vulnerability-patch-ksmbd-immediately/
• https://www.zerodayinitiative.com/advisories/ZDI-22-1690/
• http://www.openwall.com/lists/oss-security/2022/12/23/10
• https://cdn.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.19.2
• https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=cf6531d98190fa2cf92a6d8bbc8af0a4740a223c
• https://github.com/torvalds/linux/commit/cf6531d98190fa2cf92a6d8bbc8af0a4740a223c
• https://www.secpod.com/blog/zero-day-server-message-block-smb-server-in-linux-kernel-5-15-has-a-critical-vulnerability-patch-ksmbd-immediately/
• https://www.zerodayinitiative.com/advisories/ZDI-22-1690/

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