CVE-2025-21639

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Source
https://cve.org/CVERecord?id=CVE-2025-21639
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2025-21639.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2025-21639
Downstream
Related
Published
2025-01-19T10:17:56.828Z
Modified
2026-03-12T02:17:34.988728Z
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: rto_min/max: avoid using current->nsproxy
Details

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

sctp: sysctl: rto_min/max: 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.rto_min/max' is used.

Database specific 
{
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/21xxx/CVE-2025-21639.json",
    "cna_assigner": "Linux"
}
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
4f3fdf3bc59cafd14c3bc2c2369efad34c7aa8b5
Fixed
c8d179f3b1c1d60bf4484f50aa67b4c70f91bff9
Fixed
246428bfb9e7db15c5cd08e1d0eca41b65af2b06
Fixed
0f78f09466744589e420935e646ae78212a38290
Fixed
4059507e34aa5fe0fa9fd5b2b5f0c8b26ab2d482
Fixed
dc9d0e3cfd16f66fbf0862857c6b391c8613ca9f
Fixed
c87f1f6ade56c711f8736901e330685b453e420e
Fixed
9fc17b76fc70763780aa78b38fcf4742384044a5

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2025-21639.json"