CVE-2023-53456 [Medium] | Information Disclosure in Linux Kernel

In the Linux kernel, the following vulnerability has been resolved: scsi: qla4xxx: Add length check when parsing nlattrs There are three places that qla4xxx parses nlattrs: - qla4xxx_set_chap_entry() - qla4xxx_iface_set_param() - qla4xxx_sysfs_ddb_set_param() and each of them directly converts the nlattr to specific pointer of structure without length checking. This could be dangerous as those attributes are not validated and a malformed nlattr (e.g., length 0) could result in an OOB read that leaks heap dirty data. Add the nla_len check before accessing the nlattr data and return EINVAL if the length check fails.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-06-15	0.02%	0.15%	+0.13%
2	2026-01-17	0.05%	0.02%	-0.03%
3	2025-10-07	—	0.05%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-06-15

0.02%

0.15%

+0.13%

2026-01-17

0.05%

0.02%

-0.03%

2025-10-07

—

0.05%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
5.5	3.1	MEDIUM	`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/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:N) Doesn’t really leak secrets in a meaningful 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	3.6	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

5.5

3.1

MEDIUM

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/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:N): Doesn’t really leak secrets in a meaningful 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

3.6

[email protected]

OS Trackers for CVE-2023-53456

vendor	priority	summary	link
`debian`	not yet assigned	CVE-2023-53456 not yet assigned priority: Debian including 1 source packages (linux), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 5.	https://security-tracker.debian.org/tracker/CVE-2023-53456
`redhat`	low	—	https://access.redhat.com/security/cve/CVE-2023-53456
`suse`	medium	—	https://www.suse.com/security/cve/CVE-2023-53456/
`ubuntu`	medium	CVE-2023-53456 medium priority: Ubuntu including 158 source packages (linux, linux-allwinner-5.19, …), 1414 status rows across 9 suites (bionic, focal, jammy, noble, plucky, questing, trusty, upstream, xenial): DNE 1017, ignored 162, released 141, not-affected 74, needed 19, needs-triage 1.	https://ubuntu.com/security/CVE-2023-53456

Affected software / configurations for CVE-2023-53456

Vendor	Product	Version	Raw CPE
linux	linux_kernel	>= 3.2, < 4.14.326	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 4.15, < 4.19.295	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 4.20, < 5.4.257	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 5.5, < 5.10.195	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 5.11, < 5.15.132	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 5.16, < 6.1.53	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 6.2, < 6.4.16	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 6.5, < 6.5.3	cpe:2.3:o:linux:linux_kernel::::::::

References for CVE-2023-53456

URL	Tags
https://git.kernel.org/stable/c/25feffb3fbd51ae81d92c65cebc0e932663828b3	Patch
https://git.kernel.org/stable/c/47cd3770e31df942e2bb925a9a855c79ed0662eb	Patch
https://git.kernel.org/stable/c/47f3be62eab50b8cd7e1ae5fc2c4dae687497c34	Patch
https://git.kernel.org/stable/c/4ed21975311247bb84e82298eeb359ec0a0fa84d	Patch
https://git.kernel.org/stable/c/5925e224cc6edfef57b20447f18323208461309b	Patch
https://git.kernel.org/stable/c/6d65079c69dc1feb817ed71f5bd15e83a7d6832d	Patch
https://git.kernel.org/stable/c/b018c0440b871d8b001c996e95fa4538bd292de6	Patch
https://git.kernel.org/stable/c/cfa6a1a79ed6d336fac7a5d87eb5471e4401829f	Patch
https://git.kernel.org/stable/c/f61fc650c47849637fa1771a31a11674c824138a	Patch

URL

CVE-2023-53456 | scsi: qla4xxx: Add length check when parsing nlattrs

Exploit prediction scoring system (EPSS) score for CVE-2023-53456

Common vulnerability scoring system (CVSS) metrics for CVE-2023-53456

Weakness enumeration for CVE-2023-53456

OS Trackers for CVE-2023-53456

Affected software / configurations for CVE-2023-53456

References for CVE-2023-53456