CVE-2023-1193: Use-after-free in setup_async_work()

Severity: medium (CVSS 6.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.0% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2023-11-01 · updated 2026-06-17
Weakness: CWE-416

Description

A use-after-free flaw was found in setup_async_work in the KSMBD implementation of the in-kernel samba server and CIFS in the Linux kernel. This issue could allow an attacker to crash the system by accessing freed work.

Affected products

Linux kernel: before 6.3; 6.3, 6.3-rc1, 6.3-rc2, 6.3-rc3, 6.3-rc4, 6.3-rc5 — fixed in 6.3

How to fix

Upgrade to a fixed version: Linux kernel 6.3. Check the vendor advisory for mitigations.

References

https://access.redhat.com/security/cve/CVE-2023-1193
https://bugzilla.redhat.com/show_bug.cgi?id=2154177
https://lkml.kernel.org/linux-cifs/20230401084951.6085-2-linkinjeon@kernel.org/T/
https://access.redhat.com/security/cve/CVE-2023-1193
https://bugzilla.redhat.com/show_bug.cgi?id=2154177
https://lkml.kernel.org/linux-cifs/20230401084951.6085-2-linkinjeon@kernel.org/T/

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