CVE-2023-0240

There is a logic error in io_uring's implementation which can be used to trigger a use-after-free vulnerability leading to privilege escalation. In the io_prep_async_work function the assumption that the last io_grab_identity call cannot return false is not true, and in this case the function will use the init_cred or the previous linked requests identity to do operations instead of using the current identity. This can lead to reference counting issues causing use-after-free. We recommend upgrading past version 5.10.161.

CVSS v3.0 7.8 HIGH

7.8^/10

CVSS v3.0 : HIGH

Vector :

Exploitability : 1.8 / Impact : 5.9

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact HIGH

Integrity Impact HIGH

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/io_uring?h=linux-5.10.y&id=788d0824269bef539fe31a785b1517882eafed93	Mailing List Patch Vendor Advisory
https://github.com/gregkh/linux/commit/1e6fa5216a0e59ef02e8b6b40d553238a3b81d49	Patch Third Party Advisory
https://kernel.dance/#788d0824269bef539fe31a785b1517882eafed93	Patch Third Party Advisory

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Configurations

Configuration 1 (hide)

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*

Information

Published : 2023-01-30 06:15

Updated : 2023-02-06 13:48

NVD link : CVE-2023-0240

Mitre link : CVE-2023-0240

JSON object : View

CWE

CWE-416

Use After Free

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Products Affected

linux

linux_kernel

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