CVE-2025-21639 — NULL Pointer Dereference in Linux
Severity
5.5MEDIUMNVD
OSV7.8OSV7.1OSV6.2
EPSS
0.0%
top 91.97%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
Timeline
PublishedJan 19
Latest updateMay 29
Description
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
syzb…
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:HExploitability: 1.8 | Impact: 3.6
Affected Packages6 packages
▶CVEListV5linux/linux4f3fdf3bc59cafd14c3bc2c2369efad34c7aa8b5 — c8d179f3b1c1d60bf4484f50aa67b4c70f91bff9+7