CVE-2023-38426

2023-07-1800:00:00

ubuntu.com

linux kernel

out-of-bounds read

smb2_find_context_vals

ksmbd-tools

bugzilla

vulnerability

9.1 High

CVSS3

Attack Vector

NETWORK

Attack Complexity

LOW

Privileges Required

NONE

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

NONE

Availability Impact

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

0.001 Low

EPSS

Percentile

41.6%

JSON

An issue was discovered in the Linux kernel before 6.3.4. ksmbd has an
out-of-bounds read in smb2_find_context_vals when create_context’s name_len
is larger than the tag length.

Bugs

<https://bugzilla.suse.com/show_bug.cgi?id=1213421>

Notes

Author	Note
rodrigo-zaiden	needs ksmbd-tools installed to enable the service, which is not installed by default.

OSVersionArchitecturePackageVersionFilename
ubuntu22.04noarchlinux< 5.15.0-83.92UNKNOWN
ubuntu23.04noarchlinux< 6.2.0-32.32UNKNOWN
ubuntu22.04noarchlinux-aws< 5.15.0-1044.49UNKNOWN
ubuntu23.04noarchlinux-aws< 6.2.0-1011.11UNKNOWN
ubuntu23.10noarchlinux-aws< 6.5.0-1003.3UNKNOWN
ubuntu24.04noarchlinux-aws< 6.5.0-1003.3UNKNOWN
ubuntu20.04noarchlinux-aws-5.15< 5.15.0-1044.49~20.04.1UNKNOWN
ubuntu22.04noarchlinux-aws-6.2< 6.2.0-1011.11~22.04.1UNKNOWN
ubuntu22.04noarchlinux-azure< 5.15.0-1046.53UNKNOWN
ubuntu23.04noarchlinux-azure< 6.2.0-1011.11UNKNOWN

OS	Version	Architecture	Package	Version	Filename
ubuntu	22.04	noarch	linux	< 5.15.0-83.92	UNKNOWN
ubuntu	23.04	noarch	linux	< 6.2.0-32.32	UNKNOWN
ubuntu	22.04	noarch	linux-aws	< 5.15.0-1044.49	UNKNOWN
ubuntu	23.04	noarch	linux-aws	< 6.2.0-1011.11	UNKNOWN
ubuntu	23.10	noarch	linux-aws	< 6.5.0-1003.3	UNKNOWN
ubuntu	24.04	noarch	linux-aws	< 6.5.0-1003.3	UNKNOWN
ubuntu	20.04	noarch	linux-aws-5.15	< 5.15.0-1044.49~20.04.1	UNKNOWN
ubuntu	22.04	noarch	linux-aws-6.2	< 6.2.0-1011.11~22.04.1	UNKNOWN
ubuntu	22.04	noarch	linux-azure	< 5.15.0-1046.53	UNKNOWN
ubuntu	23.04	noarch	linux-azure	< 6.2.0-1011.11	UNKNOWN