8.1

CVE-2025-21947: linux Race Condition

CVSS: 8.1v3.1HighModified
AliasesUBUNTU-CVE-2025-21947DEBIAN-CVE-2025-21947
Published 01-04-2025Last modified 05-08-2026
Open JSON

Vulnerability summary

CVE-2025-21947 is a high (CVSS 8.1) Race Condition vulnerability in linux. EPSS estimates a 0.38% chance of exploitation in the next 30 days, higher than 30.5% of scored vulnerabilities.

Overall risk
32/100
0100
Medium · default modelHow is this calculated?
CVSS score
8.1/10
010
High · v3.1 (CVE.org)
EPSS score
0.38%
0%100%
Low · +0.01 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 20 · Related 18
DLA-4193-1DSA-5900-1USN-7605-1USN-7605-2USN-7606-1USN-7628-1

Timeline

  1. 01-04-2025
    PublishedVulnerability first disclosed.
  2. 05-08-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: ksmbd: fix type confusion via race condition when using ipc_msg_send_request req->handle is allocated using ksmbd_acquire_id(&ipc_ida), based on ida_alloc. req->handle from ksmbd_ipc_login_request and FSCTL_PIPE_TRANSCEIVE ioctl can be same and it could lead to type confusion between messages, resulting in access to unexpected parts of memory after an incorrect delivery. ksmbd check type of ipc response but missing add continue to check next ipc reponse.

CVSS metrics

5 scores · 4 sources · 2 versions

EPSS trend

Probability

0.38%

Chance of exploitation in the next 30 days

Percentile

31%

Versus all other CVEs

30-day change

+0.01 pp

From 0.37% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.38%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Ubuntu126 products
  • linuxAll versions (No fix recorded) | < 6.8.0-84.84
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 6.8.0-1039.41
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ 0626e6641f6b467447c81dd7678a69c66f7746cf, < 6321bbda4244b93802d61cfe0887883aae322f4b | ≥ 0626e6641f6b467447c81dd7678a69c66f7746cf, < 76861630b29e51373e73e7b00ad0d467b6941162 | ≥ 0626e6641f6b467447c81dd7678a69c66f7746cf, < 3cb2b2e41541fe6f9cc55ca22d4c0bd260498aea | ≥ 0626e6641f6b467447c81dd7678a69c66f7746cf, < 1e8833c03a38e1d5d5df6484e3f670a2fd38fb76 | ≥ 0626e6641f6b467447c81dd7678a69c66f7746cf, < e2ff19f0b7a30e03516e6eb73b948e27a55bc9d2 | 5.15
  • linux_kernel≥ 5.15, < 6.1.131 | ≥ 6.2, < 6.6.83 | ≥ 6.7, < 6.12.19 | ≥ 6.13, < 6.13.7 | 6.14:rc1 | 6.14:rc2 | 6.14:rc3 | 6.14:rc4 | 6.14:rc5
Debian1 product
  • linux< 6.1.133-1 | < 6.12.19-1

3 vendors · 129 products

References

29 links
Show all 29 references