CVE-2025-21641
Severity CVSS v4.0:
Pending analysis
Type:
CWE-476
NULL Pointer Dereference
Publication date:
19/01/2025
Last modified:
01/10/2025
Description
In the Linux kernel, the following vulnerability has been resolved:<br />
<br />
mptcp: sysctl: blackhole timeout: avoid using current->nsproxy<br />
<br />
As mentioned in the previous commit, using the &#39;net&#39; structure via<br />
&#39;current&#39; is not recommended for different reasons:<br />
<br />
- Inconsistency: getting info from the reader&#39;s/writer&#39;s netns vs only<br />
from the opener&#39;s netns.<br />
<br />
- current->nsproxy can be NULL in some cases, resulting in an &#39;Oops&#39;<br />
(null-ptr-deref), e.g. when the current task is exiting, as spotted by<br />
syzbot [1] using acct(2).<br />
<br />
The &#39;pernet&#39; structure can be obtained from the table->data using<br />
container_of().
Impact
Base Score 3.x
5.50
Severity 3.x
MEDIUM
Vulnerable products and versions
| CPE | From | Up to |
|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | 6.12 (including) | 6.12.10 (excluding) |
| cpe:2.3:o:linux:linux_kernel:6.13:rc1:*:*:*:*:*:* | ||
| cpe:2.3:o:linux:linux_kernel:6.13:rc2:*:*:*:*:*:* | ||
| cpe:2.3:o:linux:linux_kernel:6.13:rc3:*:*:*:*:*:* | ||
| cpe:2.3:o:linux:linux_kernel:6.13:rc4:*:*:*:*:*:* | ||
| cpe:2.3:o:linux:linux_kernel:6.13:rc5:*:*:*:*:*:* | ||
| cpe:2.3:o:linux:linux_kernel:6.13:rc6:*:*:*:*:*:* |
To consult the complete list of CPE names with products and versions, see this page