7.8

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

Modified
AliasesUBUNTU-CVE-2025-39788DEBIAN-CVE-2025-39788
Published 11-09-2025Last modified 12-05-2026

Vulnerability summary

CVE-2025-39788 is a high (CVSS 7.8) Out-of-bounds Write vulnerability in debian debian_linux. EPSS estimates a 0.17% chance of exploitation in the next 30 days, higher than 6.5% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 7.8, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
7.8/10
010
High · v3.1 (NVD)
EPSS score
0.17%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 44 · Related 40
DLA-4327-1DLA-4328-1DSA-6008-1DSA-6009-1OPENSUSE-SU-2025:20081-1SUSE-SU-2025:21074-1

Timeline

  1. 11-09-2025
    PublishedVulnerability first disclosed.
  2. 12-05-2026
    Last modifiedVulnerability information updated.

Description

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.

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.17%

Chance of exploitation in the next 30 days

Percentile

7%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.17% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Version check

Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu136 products
  • linux< 5.15.0-163.173 | < 6.8.0-100.100
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-aws< 5.15.0-1097.104 | < 6.8.0-1046.49
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Debian2 products
  • linux< 6.1.153-1 | < 6.12.48-1 | < 6.16.5-1
  • debian_linuxEOL11.0
Linux2 products
  • linux≥ 55f4b1f73631a0817717fe6e98517de51b4c3527, < 01510a9e8222f11cce064410f3c2fcf0756c0a08 | ≥ 55f4b1f73631a0817717fe6e98517de51b4c3527, < 098b2c8ee208c77126839047b9e6e1925bb35baa | ≥ 55f4b1f73631a0817717fe6e98517de51b4c3527, < c1f025da8f370a015e412b55cbcc583f91de8316 | ≥ 55f4b1f73631a0817717fe6e98517de51b4c3527, < 6d53b2a134da77eb7fe65c5c7c7a3c193539a78a | ≥ 55f4b1f73631a0817717fe6e98517de51b4c3527, < dc8fb963742f1a38d284946638f9358bdaa0ddee | ≥ 55f4b1f73631a0817717fe6e98517de51b4c3527, < 5b9f1ef293428ea9c0871d96fcec2a87c4445832 | ≥ 55f4b1f73631a0817717fe6e98517de51b4c3527, < 01aad16c2257ab8ff33b152b972c9f2e1af47912 | 5.9
  • linux_kernel≥ 5.9, < 5.10.241 | ≥ 5.11, < 5.15.190 | ≥ 5.16, < 6.1.149 | ≥ 6.2, < 6.6.103 | ≥ 6.7, < 6.12.44 | ≥ 6.13, < 6.16.4

3 vendors · 140 products

References

39 links
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