CVE-2025-38112 [Medium] | Security Vulnerability in Linux Kernel

In the Linux kernel, the following vulnerability has been resolved: net: Fix TOCTOU issue in sk_is_readable() sk->sk_prot->sock_is_readable is a valid function pointer when sk resides in a sockmap. After the last sk_psock_put() (which usually happens when socket is removed from sockmap), sk->sk_prot gets restored and sk->sk_prot->sock_is_readable becomes NULL. This makes sk_is_readable() racy, if the value of sk->sk_prot is reloaded after the initial check. Which in turn may lead to a null pointer dereference. Ensure the function pointer does not turn NULL after the check.

#	Date	Old EPSS score	New EPSS score	Delta (New - Old)
1	2026-04-29	0.02%	0.09%	+0.07%
2	2025-12-18	0.05%	0.02%	-0.03%
3	2025-10-17	—	0.05%	—

Date

Old EPSS score

New EPSS score

Delta (New - Old)

2026-04-29

0.02%

0.09%

+0.07%

2025-12-18

0.05%

0.02%

-0.03%

2025-10-17

—

0.05%

—

Base score	Version	Severity	Vector	Exploitability	Impact	Score source
4.7	3.1	MEDIUM	`CVSS:3.1/AV:L/AC:H/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:H) Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work. 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.	1.0	3.6	[email protected]

Base score

Version

Severity

Vector

Exploitability

Impact

Score source

4.7

3.1

MEDIUM

CVSS:3.1/AV:L/AC:H/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:H): Even with access, the exploit needs extra luck, timing, or a fussy environment to actually work.
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.

1.0

3.6

[email protected]

OS Trackers for CVE-2025-38112

vendor	priority	summary	link
`debian`	not yet assigned	CVE-2025-38112 not yet assigned priority: Debian including 2 source packages (linux, linux-6.1), 6 status rows across 5 suites (bookworm, bullseye, forky, sid, trixie): resolved 6.	https://security-tracker.debian.org/tracker/CVE-2025-38112
`redhat`	medium	—	https://access.redhat.com/security/cve/CVE-2025-38112
`suse`	medium	CVE-2025-38112 severity moderate: SUSE including 483 source package names (2.1.3-6.67:kernel-default-base-6.4.0-32.1.21.10, 2.1.3-7.44:kernel-default-6.4.0-32.1, …), 1002 product×package rows across 201 product lines (Container suse/sl-micro/6.0/base-os-container, Container suse/sl-micro/6.0/kvm-os-container, … (201 product lines)): Fixed 697, Known Affected 231, Known Not Affected 53, First Fixed 21.	https://www.suse.com/security/cve/CVE-2025-38112/
`ubuntu`	medium	CVE-2025-38112 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 169, ignored 164, not-affected 45, needed 25, needs-triage 2, pending 1.	https://ubuntu.com/security/CVE-2025-38112

Affected software / configurations for CVE-2025-38112

Vendor	Product	Version	Raw CPE
linux	linux_kernel	>= 4.17, < 5.10.239	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 5.11, < 5.15.186	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 5.16, < 6.1.142	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 6.2, < 6.6.94	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 6.7, < 6.12.34	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	>= 6.13, < 6.15.3	cpe:2.3:o:linux:linux_kernel::::::::
linux	linux_kernel	6.16	cpe:2.3:o:linux:linux_kernel:6.16:rc1::::::
debian	debian_linux	11.0	cpe:2.3:o:debian:debian_linux:11.0:::::::*

References for CVE-2025-38112

URL	Tags
https://git.kernel.org/stable/c/1b367ba2f94251822577daed031d6b9a9e11ba91	Patch
https://git.kernel.org/stable/c/1e0de7582ceccbdbb227d4e0ddf65732f92526da	Patch
https://git.kernel.org/stable/c/2660a544fdc0940bba15f70508a46cf9a6491230	Patch
https://git.kernel.org/stable/c/6fa68d7eab34d448a61aa24ea31e68b3231ed20d	Patch
https://git.kernel.org/stable/c/8926a7ef1977a832dd6bf702f1a99303dbf15b15	Patch
https://git.kernel.org/stable/c/c2b26638476baee154920bb587fc94ff1bf04336	Patch
https://git.kernel.org/stable/c/ff55c85a923e043d59d26b20a673a1b4a219c310	Patch
https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html	Third Party Advisory
https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html	Third Party Advisory

URL

CVE-2025-38112 | net: Fix TOCTOU issue in sk_is_readable()

Exploit prediction scoring system (EPSS) score for CVE-2025-38112

Common vulnerability scoring system (CVSS) metrics for CVE-2025-38112

Weakness enumeration for CVE-2025-38112

OS Trackers for CVE-2025-38112

Affected software / configurations for CVE-2025-38112

References for CVE-2025-38112