CVE-2023-53569 [High] | Security Vulnerability in Linux Kernel

In the Linux kernel, the following vulnerability has been resolved: ext2: Check block size validity during mount Check that log of block size stored in the superblock has sensible value. Otherwise the shift computing the block size can overflow leading to undefined behavior.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2025-10-05	—	0.02%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2025-10-05

—

0.02%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
7.8	3.1	HIGH	`CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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:H) They could widely tamper with or forge data—trust in the data is badly hurt. Availability (A:H) Could take the service down hard or make it unusable for people who depend on it.	1.8	5.9	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

7.8

3.1

HIGH

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/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:H): They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H): Could take the service down hard or make it unusable for people who depend on it.

1.8

5.9

[email protected]

OS Trackers for CVE-2023-53569

vendor	priority	summary	link
`debian`	not yet assigned	CVE-2023-53569 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-2023-53569
`redhat`	medium	—	https://access.redhat.com/security/cve/CVE-2023-53569
`suse`	medium	CVE-2023-53569 severity moderate: SUSE including 26 source package names (cluster-md-kmp-default, dlm-kmp-default, …), 239 product×package rows across 47 product lines (SLES-LTSS-TERADATA 15 SP2, SUSE Linux Enterprise High Availability Extension 15 SP7, … (47 product lines)): Known Not Affected 239.	https://www.suse.com/security/cve/CVE-2023-53569/
`ubuntu`	medium	CVE-2023-53569 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 138, not-affected 76, needed 20, needs-triage 1.	https://ubuntu.com/security/CVE-2023-53569

Affected software / configurations for CVE-2023-53569

Vendor	Product	Version	Raw CPE
linux	linux_kernel	>= 2.6.12.1, < 4.14.316	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 4.15, < 4.19.284	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 4.20, < 5.4.244	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 5.5, < 5.10.181	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 5.11, < 5.15.113	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 5.16, < 6.1.30	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 6.2, < 6.3.4	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	2.6.12	cpe:2.3:o:linux:linux_kernel:2.6.12:-::::::
linux	linux_kernel	2.6.12	cpe:2.3:o:linux:linux_kernel:2.6.12:rc2::::::
linux	linux_kernel	2.6.12	cpe:2.3:o:linux:linux_kernel:2.6.12:rc3::::::
linux	linux_kernel	2.6.12	cpe:2.3:o:linux:linux_kernel:2.6.12:rc4::::::
linux	linux_kernel	2.6.12	cpe:2.3:o:linux:linux_kernel:2.6.12:rc5::::::

References for CVE-2023-53569

URL	Tags
https://git.kernel.org/stable/c/0ebfaf14150f55550cffb1148ed3920143c7a69c	Patch
https://git.kernel.org/stable/c/22ab5fed07ad4b206ea910fd0132d1a0d4831584	Patch
https://git.kernel.org/stable/c/451b98155be5dfee05bc6e7c8b30c0be4add3f71	Patch
https://git.kernel.org/stable/c/62aeb94433fcec80241754b70d0d1836d5926b0a	Patch
https://git.kernel.org/stable/c/99f8a15af6c9f0653193104a9e70891f950c6001	Patch
https://git.kernel.org/stable/c/c2e7776843a953fd7e48895c3880c277f996193e	Patch
https://git.kernel.org/stable/c/c4813f858e5c3e4c4659ce95385c1c400c593e1e	Patch
https://git.kernel.org/stable/c/e6f4fb28890c1361e0db9eb1adee3fc04e7fe7f5	Patch

URL

CVE-2023-53569 | ext2: Check block size validity during mount

Exploit prediction scoring system (EPSS) score for CVE-2023-53569

Common vulnerability scoring system (CVSS) metrics for CVE-2023-53569

Weakness enumeration for CVE-2023-53569

OS Trackers for CVE-2023-53569

Affected software / configurations for CVE-2023-53569

References for CVE-2023-53569