CVE-2025-21648
Last modified
CVE-2025-21648 is a medium-severity vulnerability rated 5.5/10 on the CVSS scale. In the Linux kernel, the following vulnerability has been resolved: netfilter: conntrack: clamp maximum hashtable size to INT_MAX Use INT_MAX as maximum size for the conntrack hashtable. Otherwise, it is possible to hit WARN_ON_ONCE in __kvmalloc_node_noprof() when resizing hashtable because __GFP_NOWARN is unset. EPSS estimates a 0.21% chance of exploitation in the next 30 days.
Description
In the Linux kernel, the following vulnerability has been resolved: netfilter: conntrack: clamp maximum hashtable size to INT_MAX Use INT_MAX as maximum size for the conntrack hashtable. Otherwise, it is possible to hit WARN_ON_ONCE in __kvmalloc_node_noprof() when resizing hashtable because __GFP_NOWARN is unset. See: 0708a0afe291 ("mm: Consider __GFP_NOWARN flag for oversized kvmalloc() calls") Note: hashtable resize is only possible from init_netns.
Metrics
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Affected Software
| Vendor | Product | Versions | Update |
|---|---|---|---|
| Linux | Linux Kernel | >= 4.7.1, < 5.10.234 | — |
| Linux | Linux Kernel | >= 5.11, < 5.15.177 | — |
| Linux | Linux Kernel | >= 5.16, < 6.1.125 | — |
| Linux | Linux Kernel | >= 6.2, < 6.6.72 | — |
| Linux | Linux Kernel | >= 6.7, < 6.12.10 | — |
| Linux | Linux Kernel | 4.7 | — |
| Linux | Linux Kernel | 6.13 | Rc1 |
References
Timeline
- Published
- Last Modified
- Status
- Modified
Frequently Asked Questions
What is CVE-2025-21648?
How severe is CVE-2025-21648?
How do I fix CVE-2025-21648?
Are you affected by CVE-2025-21648?
Run a free Strix scan to check your systems for this vulnerability.
Scan your code nowSource: NVD / NIST