CVE-2025-21636
- Source
- https://nvd.nist.gov/vuln/detail/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
- 2025-11-28T02:35:15.743195Z
- 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
-
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- https://git.kernel.org/stable/c/1dc5da6c4178f3e4b95c631418f72de9f86c0449
- https://git.kernel.org/stable/c/284a221f8fa503628432c7bb5108277c688c6ffa
- https://git.kernel.org/stable/c/44ee8635922b6eb940faddb961a8347c6857d722
- https://git.kernel.org/stable/c/6259d2484d0ceff42245d1f09cc8cb6ee72d847a
- https://git.kernel.org/stable/c/bcf8c60074e81ed2ac2d35130917175a3949c917
- https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/21xxx/CVE-2025-21636.json
- https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html
- https://nvd.nist.gov/vuln/detail/CVE-2025-21636
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
-
Introducedd1e462a7a5f359cbb9a0e8fbfafcfb6657034105Fixed1dc5da6c4178f3e4b95c631418f72de9f86c0449Fixed44ee8635922b6eb940faddb961a8347c6857d722Fixed284a221f8fa503628432c7bb5108277c688c6ffaFixedbcf8c60074e81ed2ac2d35130917175a3949c917Fixed6259d2484d0ceff42245d1f09cc8cb6ee72d847a