CVE-2025-21641
- Source
- https://nvd.nist.gov/vuln/detail/CVE-2025-21641
- Import Source
- https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2025-21641.json
- JSON Data
- https://api.osv.dev/v1/vulns/CVE-2025-21641
- Downstream
- Published
- 2025-01-19T11:15:09Z
- Modified
- 2025-10-01T20:18:16Z
- 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
- [none]
- Details
-
In the Linux kernel, the following vulnerability has been resolved:
mptcp: sysctl: blackhole timeout: avoid using current->nsproxy
As mentioned in the previous commit, 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 'pernet' structure can be obtained from the table->data using container_of().
- References