CVE-2025-39788 | scsi: ufs: exynos: Fix programming of HCI_UTRL_NEXUS_TYPE

In the Linux kernel, the following vulnerability has been resolved: scsi: ufs: exynos: Fix programming of HCI_UTRL_NEXUS_TYPE On Google gs101, the number of UTP transfer request slots (nutrs) is 32, and in this case the driver ends up programming the UTRL_NEXUS_TYPE incorrectly as 0. This is because the left hand side of the shift is 1, which is of type int, i.e. 31 bits wide. Shifting by more than that width results in undefined behaviour. Fix this by switching to the BIT() macro, which applies correct type casting as required. This ensures the correct value is written to UTRL_NEXUS_TYPE (0xffffffff on gs101), and it also fixes a UBSAN shift warning: UBSAN: shift-out-of-bounds in drivers/ufs/host/ufs-exynos.c:1113:21 shift exponent 32 is too large for 32-bit type 'int' For consistency, apply the same change to the nutmrs / UTMRL_NEXUS_TYPE write.

Published: 2025-09-11 Last update: 2026-05-12 Assigner: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 Source: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2025-39788 is rated Low Risk (32.9/100): CVSS High severity, with low exploitation likelihood (EPSS 0.02%). Monitor for updates and reassess as exploit intelligence or EPSS changes.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2025-39788

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-01-17 0.06% 0.02% -0.04%
2 2026-01-11 0.02% 0.06% +0.04%
3 2025-09-12 — 0.02% —

Full EPSS history (3 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2025-39788

CVSS metrics for this CVE.

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]

Weakness enumeration for CVE-2025-39788

GitHub Security Advisory for CVE-2025-39788

GHSA-44fw-3x9p-jf29 · Severity: high — In the Linux kernel, the following vulnerability has been resolved: scsi: ufs: exynos: Fix...

OS Trackers for CVE-2025-39788

vendor priority summary link
debian not yet assigned CVE-2025-39788 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-2025-39788
redhat — — https://access.redhat.com/security/cve/CVE-2025-39788
suse medium CVE-2025-39788 severity moderate: SUSE including 468 source package names (2.1.3-6.114:kernel-default-base-6.4.0-38.1.21.15, 2.1.3-7.116:kernel-rt-6.4.0-39.1, …), 964 product×package rows across 185 product lines (Container suse/sl-micro/6.0/base-os-container, Container suse/sl-micro/6.0/kvm-os-container, … (185 product lines)): Fixed 607, Known Affected 231, Known Not Affected 105, First Fixed 21. https://www.suse.com/security/cve/CVE-2025-39788/
ubuntu medium CVE-2025-39788 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 176, released 150, not-affected 62, needed 6, needs-triage 2, pending 1. https://ubuntu.com/security/CVE-2025-39788

Affected software / configurations for CVE-2025-39788

Vendor Product Version Raw CPE
linux linux_kernel >= 5.9, < 5.10.241 cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
linux linux_kernel >= 5.11, < 5.15.190 cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
linux linux_kernel >= 5.16, < 6.1.149 cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
linux linux_kernel >= 6.2, < 6.6.103 cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
linux linux_kernel >= 6.7, < 6.12.44 cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
linux linux_kernel >= 6.13, < 6.16.4 cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
debian debian_linux 11.0 cpe:2.3:o:debian:debian_linux:11.0:*:*:*:*:*:*:*

References for CVE-2025-39788

URL Tags
https://git.kernel.org/stable/c/01510a9e8222f11cce064410f3c2fcf0756c0a08 Patch
https://git.kernel.org/stable/c/01aad16c2257ab8ff33b152b972c9f2e1af47912 Patch
https://git.kernel.org/stable/c/098b2c8ee208c77126839047b9e6e1925bb35baa Patch
https://git.kernel.org/stable/c/5b9f1ef293428ea9c0871d96fcec2a87c4445832 Patch
https://git.kernel.org/stable/c/6d53b2a134da77eb7fe65c5c7c7a3c193539a78a Patch
https://git.kernel.org/stable/c/c1f025da8f370a015e412b55cbcc583f91de8316 Patch
https://git.kernel.org/stable/c/dc8fb963742f1a38d284946638f9358bdaa0ddee 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
https://cert-portal.siemens.com/productcert/html/ssa-032379.html
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