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
- 2025-01-19T10:17:58.351Z
- Modified
- 2025-11-20T07:37:36.309914Z
- 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
- mptcp: sysctl: blackhole timeout: avoid using current->nsproxy
- 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
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
-
Introduced27069e7cb3d1cea9377069266acf19b9cc5ad0aeFixed4c74fbdc5ab95b13945be01e6065940b68222db7
- Type
- GIT
- Repo
- https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
- Events
-
Introduced27069e7cb3d1cea9377069266acf19b9cc5ad0aeFixed92cf7a51bdae24a32c592adcdd59a773ae149289
Affected versions
v6.*
v6.11
v6.11-rc7
v6.12
v6.12-rc1
v6.12-rc2
v6.12-rc3
v6.12-rc4
v6.12-rc5
v6.12-rc6
v6.12-rc7
v6.12.1
v6.12.2
v6.12.3
v6.12.4
v6.12.5
v6.12.6
v6.12.7
v6.12.8
v6.12.9
v6.13-rc1
v6.13-rc2
v6.13-rc3
v6.13-rc4
v6.13-rc5
Database specific
vanir_signatures
[
{
"deprecated": false,
"signature_version": "v1",
"digest": {
"threshold": 0.9,
"line_hashes": [
"50322283222408042904436991496404848007",
"330662345393623450276462579238407552530",
"33009271392973920657775296684662676088",
"43838410061291903620447600082491000325"
]
},
"id": "CVE-2025-21641-5af42227",
"signature_type": "Line",
"source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@4c74fbdc5ab95b13945be01e6065940b68222db7",
"target": {
"file": "net/mptcp/ctrl.c"
}
},
{
"deprecated": false,
"signature_version": "v1",
"digest": {
"length": 327.0,
"function_hash": "107472346627341613991864255234944550194"
},
"id": "CVE-2025-21641-72e0c9af",
"signature_type": "Function",
"source": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git@4c74fbdc5ab95b13945be01e6065940b68222db7",
"target": {
"file": "net/mptcp/ctrl.c",
"function": "proc_blackhole_detect_timeout"
}
}
]