CVE-2023-53032 [Medium] | Integer Overflow in Linux Kernel

In the Linux kernel, the following vulnerability has been resolved: netfilter: ipset: Fix overflow before widen in the bitmap_ip_create() function. When first_ip is 0, last_ip is 0xFFFFFFFF, and netmask is 31, the value of an arithmetic expression 2 << (netmask - mask_bits - 1) is subject to overflow due to a failure casting operands to a larger data type before performing the arithmetic. Note that it's harmless since the value will be checked at the next step. Found by InfoTeCS on behalf of Linux Verification Center (linuxtesting.org) with SVACE.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-06-15	0.03%	0.17%	+0.15%
2	2026-05-05	0.09%	0.03%	-0.07%
3	2026-01-21	—	0.09%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-06-15

0.03%

0.17%

+0.15%

2026-05-05

0.09%

0.03%

-0.07%

2026-01-21

—

0.09%

—

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-2023-53032

vendor	priority	summary	link
`debian`	not yet assigned	CVE-2023-53032 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-2023-53032
`redhat`	medium	—	https://access.redhat.com/security/cve/CVE-2023-53032
`suse`	medium	CVE-2023-53032 severity moderate: SUSE including 288 source package names (amazon/suse-sles-15-sp1-chost-byos-v20210304-hvm-ssd-x86_64, amazon/suse-sles-15-sp1-chost-byos-v20220127-hvm-ssd-x86_64, …), 445 product×package rows across 43 product lines (Image SLES12-SP5-Azure-BYOS, Image SLES12-SP5-Azure-HPC-BYOS, … (43 product lines)): Known Affected 231, Known Not Affected 120, Fixed 94.	https://www.suse.com/security/cve/CVE-2023-53032/
`ubuntu`	medium	CVE-2023-53032 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 154, ignored 149, not-affected 98, needed 4, needs-triage 1.	https://ubuntu.com/security/CVE-2023-53032

Affected software / configurations for CVE-2023-53032

Vendor	Product	Version	Raw CPE
linux	linux_kernel	>= 3.7, < 4.14.303	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 4.15, < 4.19.270	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 4.20, < 5.4.229	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 5.5, < 5.10.164	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 5.11, < 5.15.89	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 5.16, < 6.1.7	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	6.2	cpe:2.3:o:linux:linux_kernel:6.2:rc1::::::
linux	linux_kernel	6.2	cpe:2.3:o:linux:linux_kernel:6.2:rc2::::::
linux	linux_kernel	6.2	cpe:2.3:o:linux:linux_kernel:6.2:rc3::::::
linux	linux_kernel	6.2	cpe:2.3:o:linux:linux_kernel:6.2:rc4::::::

References for CVE-2023-53032

URL	Tags
https://git.kernel.org/stable/c/4e6a70fd840400e3a2e784a6673968a3eb2431c0	Patch
https://git.kernel.org/stable/c/511cf17b2447fc41cfef8d71936e1fa53e395c1e	Patch
https://git.kernel.org/stable/c/9ea4b476cea1b7d461d16dda25ca3c7e616e2d15	Patch
https://git.kernel.org/stable/c/dfd834ccc1b88bbbab81b9046a3a539dd0c2d14f	Patch
https://git.kernel.org/stable/c/e137d9bb26bd85ce07323a38e38ceb0b160db841	Patch
https://git.kernel.org/stable/c/e88865876d47c790be0d5e23973499d75d034364	Patch
https://git.kernel.org/stable/c/feefb33eefa166fc3e0fd17547b0bc0cb3baced9	Patch

URL

CVE-2023-53032 | netfilter: ipset: Fix overflow before widen in the bitmap_ip_create() function.

Exploit prediction scoring system (EPSS) score for CVE-2023-53032

Common vulnerability scoring system (CVSS) metrics for CVE-2023-53032

Weakness enumeration for CVE-2023-53032

OS Trackers for CVE-2023-53032

Affected software / configurations for CVE-2023-53032

References for CVE-2023-53032