CVE-2025-21637

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Source
https://cve.org/CVERecord?id=CVE-2025-21637
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2025-21637.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2025-21637
Downstream
Related
Published
2025-01-19T10:17:55.321Z
Modified
2026-03-20T12:40:37.379398Z
Severity
  • 5.5 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H CVSS Calculator
Summary
sctp: sysctl: udp_port: avoid using current->nsproxy
Details

In the Linux kernel, the following vulnerability has been resolved:

sctp: sysctl: udp_port: avoid using current->nsproxy

As mentioned in a previous commit of this series, using the 'net' structure via 'current' is not recommended for different reasons:

  • Inconsistency: getting info from the reader's/writer's netns vs only from the opener's netns.

  • current->nsproxy can be NULL in some cases, resulting in an 'Oops' (null-ptr-deref), e.g. when the current task is exiting, as spotted by syzbot [1] using acct(2).

The 'net' structure can be obtained from the table->data using container_of().

Note that table->data could also be used directly, but that would increase the size of this fix, while 'sctp.ctl_sock' still needs to be retrieved from 'net' structure.

Database specific 
{
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/21xxx/CVE-2025-21637.json"
}
References

Affected packages

Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

Affected ranges

Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
046c052b475e7119b6a30e3483e2888fc606a2f8
Fixed
0a0966312ac3eedd7f5f2a766ed4702df39a9a65
Fixed
e919197fb8616331f5dc81e4c3cc3d12769cb725
Fixed
55627918febdf9d71107a1e68d1528dc591c9a15
Fixed
5b77d73f3be5102720fb685b9e6900e3500e1096
Fixed
c10377bbc1972d858eaf0ab366a311b39f8ef1b6

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2025-21637.json"