CVE-2023-53034 [High] | Out-of-bounds Read in Linux Kernel

In the Linux kernel, the following vulnerability has been resolved: ntb_hw_switchtec: Fix shift-out-of-bounds in switchtec_ntb_mw_set_trans There is a kernel API ntb_mw_clear_trans() would pass 0 to both addr and size. This would make xlate_pos negative. [ 23.734156] switchtec switchtec0: MW 0: part 0 addr 0x0000000000000000 size 0x0000000000000000 [ 23.734158] ================================================================================ [ 23.734172] UBSAN: shift-out-of-bounds in drivers/ntb/hw/mscc/ntb_hw_switchtec.c:293:7 [ 23.734418] shift exponent -1 is negative Ensuring xlate_pos is a positive or zero before BIT.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-06-15	0.01%	0.17%	+0.16%
2	2026-06-03	0.08%	0.01%	-0.06%
3	2026-02-10	—	0.08%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-06-15

0.01%

0.17%

+0.16%

2026-06-03

0.08%

0.01%

-0.06%

2026-02-10

—

0.08%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
7.1	3.1	HIGH	`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H` Click to expand Attack vector (AV:L) They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by. Attack complexity (AC:L) Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup. Privileges required (PR:L) A normal user session is enough; they don’t have to be admin. User interaction (UI:N) Nobody has to click “OK” or open a trap file; it can work without a victim helping. Scope (S:U) Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems. Confidentiality (C:H) Serious risk that confidential data gets exposed in a big way. Integrity (I:N) Data isn’t meaningfully altered or forged. Availability (A:H) Could take the service down hard or make it unusable for people who depend on it.	1.8	5.2	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

7.1

3.1

HIGH

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

Attack vector (AV:L): They already need access on the box, or another person has to do something wrong; it’s not a remote drive-by.
Attack complexity (AC:L): Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L): A normal user session is enough; they don’t have to be admin.
User interaction (UI:N): Nobody has to click “OK” or open a trap file; it can work without a victim helping.
Scope (S:U): Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H): Serious risk that confidential data gets exposed in a big way.
Integrity (I:N): Data isn’t meaningfully altered or forged.
Availability (A:H): Could take the service down hard or make it unusable for people who depend on it.

1.8

5.2

[email protected]

OS Trackers for CVE-2023-53034

vendor	priority	summary	link
`debian`	not yet assigned	CVE-2023-53034 not yet assigned priority: Debian including 2 source packages (linux, linux-6.1), 6 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 6.	https://security-tracker.debian.org/tracker/CVE-2023-53034
`redhat`	medium	—	https://access.redhat.com/security/cve/CVE-2023-53034
`suse`	medium	—	https://www.suse.com/security/cve/CVE-2023-53034/
`ubuntu`	medium	CVE-2023-53034 medium priority: Ubuntu including 158 source packages (linux, linux-allwinner-5.19, …), 1551 status rows across 10 suites (bionic, focal, jammy, noble, oracular, plucky, questing, trusty, upstream, xenial): DNE 1145, released 200, ignored 149, not-affected 54, needs-triage 2, needed 1.	https://ubuntu.com/security/CVE-2023-53034

Affected software / configurations for CVE-2023-53034

Vendor	Product	Version	Raw CPE
linux	linux_kernel	>= 4.16, < 5.4.292	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 5.5, < 5.10.236	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 5.11, < 5.15.180	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 5.16, < 6.1.134	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 6.2, < 6.6.87	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 6.7, < 6.12.23	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 6.13, < 6.13.11	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 6.14, < 6.14.2	cpe:2.3:o:linux:linux_kernel::::::::

References for CVE-2023-53034

URL	Tags
https://git.kernel.org/stable/c/0df2e03e4620548b41891b4e0d1bd9d2e0d8a39a	Patch
https://git.kernel.org/stable/c/2429bdf26a0f3950fdd996861e9c1a3873af1dbe	Patch
https://git.kernel.org/stable/c/36d32cfb00d42e865396424bb5d340fc0a28870d	Patch
https://git.kernel.org/stable/c/5b6857bb3bfb0dae17fab1e42c1e82c204a508b1	Patch
https://git.kernel.org/stable/c/7ed22f8d8be26225a78cf5e85b2036421a6bf2d5	Patch
https://git.kernel.org/stable/c/c61a3f2df162ba424be0141649a9ef5f28eaccc1	Patch
https://git.kernel.org/stable/c/cb153bdc1812a3375639ed6ca5f147eaefb65349	Patch
https://git.kernel.org/stable/c/de203da734fae00e75be50220ba5391e7beecdf9	Patch
https://git.kernel.org/stable/c/f56951f211f181410a383d305e8d370993e45294	Patch
https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html
https://lists.debian.org/debian-lts-announce/2025/05/msg00045.html

URL

CVE-2023-53034 | ntb_hw_switchtec: Fix shift-out-of-bounds in switchtec_ntb_mw_set_trans

Exploit prediction scoring system (EPSS) score for CVE-2023-53034

Common vulnerability scoring system (CVSS) metrics for CVE-2023-53034

Weakness enumeration for CVE-2023-53034

OS Trackers for CVE-2023-53034

Affected software / configurations for CVE-2023-53034

References for CVE-2023-53034