7.5

CVE-2025-39720: ksmbd: fix refcount leak causing resource not released

Modified
AliasesUBUNTU-CVE-2025-39720DEBIAN-CVE-2025-39720
Published 05-09-2025Last modified 30-10-2026

Vulnerability summary

CVE-2025-39720 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 19 · Related 16
DSA-6008-1MGASA-2025-0234MGASA-2025-0235USN-8028-1USN-8028-2USN-8028-3

Timeline

  1. 05-09-2025
    PublishedVulnerability first disclosed.
  2. 30-10-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix refcount leak causing resource not released When ksmbd_conn_releasing(opinfo->conn) returns true,the refcount was not decremented properly, causing a refcount leak that prevents the count from reaching zero and the memory from being released.

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 0.29% 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.

Ubuntu149 products
  • linuxAll versions (No fix recorded) | < 6.8.0-100.100
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 6.8.0-1046.49
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ 0626e6641f6b467447c81dd7678a69c66f7746cf, < 263680d314eaaa27334f486d86c9fe7d19f50c8a | ≥ 0626e6641f6b467447c81dd7678a69c66f7746cf, < a1d2bab4d53368a526c97aba92671dd71814f95a | ≥ 0626e6641f6b467447c81dd7678a69c66f7746cf, < 36e010bb865fbaa1202fe9bcce3fd486d6db7606 | ≥ 0626e6641f6b467447c81dd7678a69c66f7746cf, < 9a7abce6e8c0e2145b346a6d4abf0d9655e9b0e8 | ≥ 0626e6641f6b467447c81dd7678a69c66f7746cf, < 89bb430f621124af39bb31763c4a8b504c9651e2 | 5.15
  • linux_kernel≥ 5.15, < 6.6.103 | ≥ 6.7, < 6.12.44 | ≥ 6.13, < 6.16.4 | 6.17:rc1 | 6.17:rc2
Debian1 product
  • linuxAll versions (No fix recorded) | < 6.12.48-1 | < 6.16.5-1

3 vendors · 152 products

References

26 links
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