CVE-2023-53684 [Medium] | Security Vulnerability in Linux Kernel

In the Linux kernel, the following vulnerability has been resolved: xfrm: Zero padding when dumping algos and encap When copying data to user-space we should ensure that only valid data is copied over. Padding in structures may be filled with random (possibly sensitve) data and should never be given directly to user-space. This patch fixes the copying of xfrm algorithms and the encap template in xfrm_user so that padding is zeroed.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-06-15	0.02%	0.13%	+0.11%
2	2025-10-08	—	0.02%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-06-15

0.02%

0.13%

+0.11%

2025-10-08

—

0.02%

—

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-2023-53684

vendor	priority	summary	link
`debian`	unimportant	CVE-2023-53684 unimportant 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-2023-53684
`redhat`	medium	—	https://access.redhat.com/security/cve/CVE-2023-53684
`suse`	medium	CVE-2023-53684 severity moderate: SUSE including 25 source package names (cluster-md-kmp-default, dlm-kmp-default, …), 113 product×package rows across 25 product lines (SUSE Linux Enterprise High Availability Extension 15 SP7, SUSE Linux Enterprise Live Patching 12 SP5, … (25 product lines)): Known Not Affected 94, Will Not Fix 19.	https://www.suse.com/security/cve/CVE-2023-53684/
`ubuntu`	medium	CVE-2023-53684 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 116, not-affected 76, needed 42, needs-triage 1.	https://ubuntu.com/security/CVE-2023-53684

Affected software / configurations for CVE-2023-53684

Vendor	Product	Version	Raw CPE
linux	linux_kernel	>= 5.11, < 5.15.106	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 5.16, < 6.1.23	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 6.2, < 6.2.10	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	6.3	cpe:2.3:o:linux:linux_kernel:6.3:rc1::::::
linux	linux_kernel	6.3	cpe:2.3:o:linux:linux_kernel:6.3:rc2::::::

References for CVE-2023-53684

URL	Tags
https://git.kernel.org/stable/c/0725daaa9a879388ed312110f62dbd5ea2d75f8f	Patch
https://git.kernel.org/stable/c/1a351e26cc010d6991fbbd5701ac16581372e26f	Patch
https://git.kernel.org/stable/c/5218af4ad5d8948faac19f71583bcd786c3852df	Patch
https://git.kernel.org/stable/c/8222d5910dae08213b6d9d4bc9a7f8502855e624	Patch

URL

CVE-2023-53684 | xfrm: Zero padding when dumping algos and encap

Exploit prediction scoring system (EPSS) score for CVE-2023-53684

Common vulnerability scoring system (CVSS) metrics for CVE-2023-53684

Weakness enumeration for CVE-2023-53684

OS Trackers for CVE-2023-53684

Affected software / configurations for CVE-2023-53684

References for CVE-2023-53684