Bug 1211537 (CVE-2023-32255) - VUL-0: CVE-2023-32255: kernel: Linux Kernel ksmbd Session Setup Memory Leak Denial-of-Service Vulnerability
Summary: VUL-0: CVE-2023-32255: kernel: Linux Kernel ksmbd Session Setup Memory Leak D...
Status: RESOLVED UPSTREAM
Alias: CVE-2023-32255
Product: openSUSE Tumbleweed
Classification: openSUSE
Component: Kernel (show other bugs)
Version: Current
Hardware: Other Other
: P3 - Medium : Normal (vote)
Target Milestone: ---
Assignee: Security Team bot
QA Contact: E-mail List
URL: https://smash.suse.de/issue/366967/
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Reported: 2023-05-19 07:35 UTC by Stoyan Manolov
Modified: 2023-05-25 06:22 UTC (History)
4 users (show)

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Found By: Security Response Team
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Description Stoyan Manolov 2023-05-19 07:35:57 UTC 
CVE-2023-32255

This vulnerability allows remote attackers to create a denial-of-service
condition on affected installations of Linux Kernel. Authentication is not
required to exploit this vulnerability, but only systems with ksmbd enabled are
vulnerable.

The specific flaw exists within the handling of SMB2_SESSION_SETUP commands. The
issue results from the lack of memory release after its effective lifetime. An
attacker can leverage this vulnerability to create a denial-of-service condition
on the system.

References:
http://web.nvd.nist.gov/view/vuln/detail?vulnId=CVE-2023-32255
https://www.zerodayinitiative.com/advisories/ZDI-23-703/
Comment 2 Michal Koutný 2023-05-22 16:30:10 UTC 
https://github.com/torvalds/linux/commit/6d7cb549c2ca20e1f07593f15e936fd54b763028

Possibly needed in the `stable` branch before v6.4 is out.