What’s Vulnerable › Vulnerabilities

CVE-2023-1194: Use-after-free in parse_lease_state()

• Severity: high (CVSS 8.1 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2023-11-03 · updated 2026-06-17
• Weakness: CWE-416

Description

An out-of-bounds (OOB) memory read flaw was found in parse_lease_state in the KSMBD implementation of the in-kernel samba server and CIFS in the Linux kernel. When an attacker sends the CREATE command with a malformed payload to KSMBD, due to a missing check of `NameOffset` in the `parse_lease_state()` function, the `create_context` object can access invalid memory.

Affected products

• Fedoraproject Fedora: 37
• Linux kernel: from 5.15 before 5.15.145; from 5.16 before 6.1.34; from 6.2 before 6.3.8; 6.4-rc1, 6.4-rc2, 6.4-rc3, 6.4-rc4, 6.4-rc5 — fixed in 5.15.145, 6.1.34, 6.3.8

How to fix

Upgrade to a fixed version: Linux kernel 5.15.145, 6.1.34, 6.3.8. Check the vendor advisory for mitigations.

References

• https://access.redhat.com/security/cve/CVE-2023-1194
• https://bugzilla.redhat.com/show_bug.cgi?id=2154176
• https://security.netapp.com/advisory/ntap-20231221-0006/
• https://www.spinics.net/lists/stable-commits/msg303065.html
• https://access.redhat.com/security/cve/CVE-2023-1194
• https://bugzilla.redhat.com/show_bug.cgi?id=2154176
• https://security.netapp.com/advisory/ntap-20231221-0006/
• https://www.spinics.net/lists/stable-commits/msg303065.html

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