CVE-2025-21636

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Source
https://cve.org/CVERecord?id=CVE-2025-21636
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2025-21636.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2025-21636
Downstream
Related
Published
2025-01-19T10:17:54.576Z
Modified
2026-03-12T02:16:50.055990Z
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: plpmtud_probe_interval: avoid using current->nsproxy
Details

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

sctp: sysctl: plpmtudprobeinterval: 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, as this is the only member needed from the 'net' structure, but that would increase the size of this fix, to use '*data' everywhere 'net->sctp.probe_interval' is used.

Database specific 
{
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/21xxx/CVE-2025-21636.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
d1e462a7a5f359cbb9a0e8fbfafcfb6657034105
Fixed
1dc5da6c4178f3e4b95c631418f72de9f86c0449
Fixed
44ee8635922b6eb940faddb961a8347c6857d722
Fixed
284a221f8fa503628432c7bb5108277c688c6ffa
Fixed
bcf8c60074e81ed2ac2d35130917175a3949c917
Fixed
6259d2484d0ceff42245d1f09cc8cb6ee72d847a

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2025-21636.json"