CVE-2025-21637
- Source
- https://nvd.nist.gov/vuln/detail/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
- 2025-11-26T19:33:55.152647Z
- 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
{ "osv_generated_from": "https://github.com/CVEProject/cvelistV5/blob/9c3874e559580d6c6ec8d449812ac11277724770/cves/2025/21xxx/CVE-2025-21637.json", "cna_assigner": "Linux" }- References
-
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- https://git.kernel.org/stable/c/0a0966312ac3eedd7f5f2a766ed4702df39a9a65
- https://git.kernel.org/stable/c/55627918febdf9d71107a1e68d1528dc591c9a15
- https://git.kernel.org/stable/c/5b77d73f3be5102720fb685b9e6900e3500e1096
- https://git.kernel.org/stable/c/c10377bbc1972d858eaf0ab366a311b39f8ef1b6
- https://git.kernel.org/stable/c/e919197fb8616331f5dc81e4c3cc3d12769cb725
- https://lists.debian.org/debian-lts-announce/2025/03/msg00001.html
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
-
Introduced046c052b475e7119b6a30e3483e2888fc606a2f8Fixed0a0966312ac3eedd7f5f2a766ed4702df39a9a65
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced046c052b475e7119b6a30e3483e2888fc606a2f8Fixede919197fb8616331f5dc81e4c3cc3d12769cb725
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced046c052b475e7119b6a30e3483e2888fc606a2f8Fixed55627918febdf9d71107a1e68d1528dc591c9a15
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced046c052b475e7119b6a30e3483e2888fc606a2f8Fixed5b77d73f3be5102720fb685b9e6900e3500e1096
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced046c052b475e7119b6a30e3483e2888fc606a2f8Fixedc10377bbc1972d858eaf0ab366a311b39f8ef1b6