7.5

CVE-2025-39942: ksmbd: smbdirect: verify remaining_data_length respects max_fragmented_recv_size

Modified
AliasesUBUNTU-CVE-2025-39942DEBIAN-CVE-2025-39942
Published 04-10-2025Last modified 05-08-2026

Vulnerability summary

CVE-2025-39942 is a high (CVSS 7.5) vulnerability in linux. EPSS estimates a 0.29% chance of exploitation in the next 30 days, higher than 21.2% of scored vulnerabilities.

Priority
Prioritisesevere

Severe, CVSS 7.5 (CVE.org); no exploitation reported by the 5 checked sources; EPSS 0% (FIRST, 03-11-2026)

Source freshness unavailable

How is this decided?
CVSS score
7.5/10
010
High · v3.1 (CVE.org)
EPSS score
0.29%
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 14 · Related 10
DLA-4379-1DSA-6053-1MGASA-2025-0309MGASA-2025-0310USN-8095-1USN-8095-2

Timeline

  1. 04-10-2025
    PublishedVulnerability first disclosed.
  2. 05-08-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: ksmbd: smbdirect: verify remaining_data_length respects max_fragmented_recv_size This is inspired by the check for data_offset + data_length.

CVSS metrics

5 scores · 4 sources · 2 versions

EPSS trend

Probability

0.29%

Chance of exploitation in the next 30 days

Percentile

21%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.28% 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

No weakness data has been published for this record.

Affected systems

Version check

Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu137 products
  • linuxAll versions (No fix recorded) | < 6.8.0-106.106
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 6.8.0-1050.53
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ 2ea086e35c3d726a3bacd0a971c1f02a50e98206, < 196a3a7676d726ee67621ea2bf3b7815ac2685b4 | ≥ 2ea086e35c3d726a3bacd0a971c1f02a50e98206, < d3cb3f209d35c44b7ee74f77ed27ebb28995b9ce | ≥ 2ea086e35c3d726a3bacd0a971c1f02a50e98206, < 9644798294c7287e65a7b26e35aa6d2ce3345bcc | ≥ 2ea086e35c3d726a3bacd0a971c1f02a50e98206, < c64b915bb3d9339adcae5db4be2c35ffbef5e615 | ≥ 2ea086e35c3d726a3bacd0a971c1f02a50e98206, < e1868ba37fd27c6a68e31565402b154beaa65df0 | 5.15
  • linux_kernel≥ 5.15.1, < 6.1.154 | ≥ 6.2, < 6.6.108 | ≥ 6.7, < 6.12.49 | ≥ 6.13, < 6.16.9 | 5.15 | 5.15:rc7 | 6.17:rc1 | 6.17:rc2 | 6.17:rc3 | 6.17:rc4 | 6.17:rc5 | 6.17:rc6
Debian1 product
  • linux< 6.1.158-1 | < 6.12.57-1 | < 6.16.9-1

3 vendors · 140 products

References

20 links
Show all 20 references