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ubuntucveUbuntu.comUB:CVE-2023-23586
HistoryFeb 17, 2023 - 12:00 a.m.

CVE-2023-23586

2023-02-1700:00:00
ubuntu.com
ubuntu.com
9

5.5 Medium

CVSS3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

NONE

Availability Impact

NONE

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

1.7 Low

CVSS2

Access Vector

LOCAL

Access Complexity

LOW

Authentication

SINGLE

Confidentiality Impact

PARTIAL

Integrity Impact

NONE

Availability Impact

NONE

AV:L/AC:L/Au:S/C:P/I:N/A:N

0.0004 Low

EPSS

Percentile

7.2%

Due to a vulnerability in the io_uring subsystem, it is possible to leak
kernel memory information to the user process. timens_install calls
current_is_single_threaded to determine if the current process is
single-threaded, but this call does not consider io_uring’s io_worker
threads, thus it is possible to insert a time namespace’s vvar page to
process’s memory space via a page fault. When this time namespace is
destroyed, the vvar page is also freed, but not removed from the process’
memory, and a next page allocated by the kernel will be still available
from the user-space process and can leak memory contents via this
(read-only) use-after-free vulnerability. We recommend upgrading past
version 5.10.161 or commit 788d0824269bef539fe31a785b1517882eafed93
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/io_uring

Notes

Author Note
mdeslaur possibly a dupe of CVE-2023-0240
sbeattie according to linuxkernelcves, fixed by 4379bf8bd70b (“io_uring: remove io_identity”), but also they ave the CVE marked as rejected / withdrawn. This would also indicate it is a likely duplicate of CVE-2022-1786.

5.5 Medium

CVSS3

Attack Vector

LOCAL

Attack Complexity

LOW

Privileges Required

LOW

User Interaction

NONE

Scope

UNCHANGED

Confidentiality Impact

HIGH

Integrity Impact

NONE

Availability Impact

NONE

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

1.7 Low

CVSS2

Access Vector

LOCAL

Access Complexity

LOW

Authentication

SINGLE

Confidentiality Impact

PARTIAL

Integrity Impact

NONE

Availability Impact

NONE

AV:L/AC:L/Au:S/C:P/I:N/A:N

0.0004 Low

EPSS

Percentile

7.2%

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