Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: netfilter: nat: use kfree_rcu to release ops Florian Westphal says: "Historically this is not an issue, even for normal base hooks: the data path doesn't use the original nf_hook_ops that are used to register the callbacks. However, in v5.14 I added the ability to dump the active netfilter hooks from userspace. This code will peek back into the nf_hook_ops that are available at the tail of the pointer-array blob used by the datapath. The nat hooks are special, because they are called indirectly from the central nat dispatcher hook. They are currently invisible to the nfnl hook dump subsystem though. But once that changes the nat ops structures have to be deferred too." Update nf_nat_register_fn() to deal with partial exposition of the hooks from error path which can be also an issue for nfnetlink_hook.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 5.14, < 6.18.33 |
| Redhat | Enterprise Linux | 9.0 |
Related Weaknesses (CWE)
References
- https://git.kernel.org/stable/c/32fdd2e38e7435a368d88f5977a7d6585ebc8b0ePatch
- https://git.kernel.org/stable/c/3c7511f38ab511b791196b13ae48bf4973bf7dfdPatch
- https://git.kernel.org/stable/c/6eda0d771f94267f73f57c94630aa47e90957915Patch
- https://access.redhat.com/errata/RHSA-2026:55445
- https://access.redhat.com/security/cve/CVE-2026-53000Third Party Advisory
- https://bugzilla.redhat.com/show_bug.cgi?id=2492273Third Party Advisory
- https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53000.jsonThird Party Advisory
FAQ
What is CVE-2026-53000?
CVE-2026-53000 is a vulnerability with a CVSS score of 7.8 (HIGH). In the Linux kernel, the following vulnerability has been resolved: netfilter: nat: use kfree_rcu to release ops Florian Westphal says: "Historically this is not an issue, even for normal base hook...
How severe is CVE-2026-53000?
CVE-2026-53000 has been rated HIGH with a CVSS base score of 7.8/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-53000?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel, Redhat Enterprise Linux.