CVE-2025-39952 [High] | Out-of-bounds Write in Linux Kernel

In the Linux kernel, the following vulnerability has been resolved: wifi: wilc1000: avoid buffer overflow in WID string configuration Fix the following copy overflow warning identified by Smatch checker. drivers/net/wireless/microchip/wilc1000/wlan_cfg.c:184 wilc_wlan_parse_response_frame() error: '__memcpy()' 'cfg->s[i]->str' copy overflow (512 vs 65537) This patch introduces size check before accessing the memory buffer. The checks are base on the WID type of received data from the firmware. For WID string configuration, the size limit is determined by individual element size in 'struct wilc_cfg_str_vals' that is maintained in 'len' field of 'struct wilc_cfg_str'.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2025-10-04	—	0.02%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2025-10-04

—

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-2025-39952

vendor	priority	summary	link
`debian`	not yet assigned	CVE-2025-39952 not yet assigned priority: Debian including 1 source packages (linux), 5 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 3, open 2.	https://security-tracker.debian.org/tracker/CVE-2025-39952
`redhat`	—	—	https://access.redhat.com/security/cve/CVE-2025-39952
`suse`	medium	CVE-2025-39952 severity moderate: SUSE including 467 source package names (2.1.3-6.88:kernel-default-base-6.4.0-36.1.21.13, 2.1.3-7.105:kernel-rt-6.4.0-38.1, …), 946 product×package rows across 188 product lines (Container suse/sl-micro/6.0/base-os-container, Container suse/sl-micro/6.0/kvm-os-container, … (188 product lines)): Fixed 619, Known Affected 231, Known Not Affected 75, First Fixed 21.	https://www.suse.com/security/cve/CVE-2025-39952/
`ubuntu`	medium	CVE-2025-39952 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 180, released 117, needed 80, not-affected 16, needs-triage 2, pending 2.	https://ubuntu.com/security/CVE-2025-39952

Affected software / configurations for CVE-2025-39952

Vendor	Product	Version	Raw CPE
linux	linux_kernel	>= 4.2, < 6.6.108	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 6.7, < 6.12.49	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 6.13, < 6.16.9	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	6.17	cpe:2.3:o:linux:linux_kernel:6.17:rc1::::::
linux	linux_kernel	6.17	cpe:2.3:o:linux:linux_kernel:6.17:rc2::::::
linux	linux_kernel	6.17	cpe:2.3:o:linux:linux_kernel:6.17:rc3::::::
linux	linux_kernel	6.17	cpe:2.3:o:linux:linux_kernel:6.17:rc4::::::

References for CVE-2025-39952

URL	Tags
https://git.kernel.org/stable/c/2203ef417044b10a8563ade6a17c74183745d72e	Patch
https://git.kernel.org/stable/c/6085291a1a5865d4ad70f0e5812d524ebd5d1711	Patch
https://git.kernel.org/stable/c/ae50f8562306a7ea1cf3c9722f97ee244f974729	Patch
https://git.kernel.org/stable/c/fe9e4d0c39311d0f97b024147a0d155333f388b5	Patch

URL

CVE-2025-39952 | wifi: wilc1000: avoid buffer overflow in WID string configuration

Exploit prediction scoring system (EPSS) score for CVE-2025-39952

Common vulnerability scoring system (CVSS) metrics for CVE-2025-39952

Weakness enumeration for CVE-2025-39952

OS Trackers for CVE-2025-39952

Affected software / configurations for CVE-2025-39952

References for CVE-2025-39952