Red HatCVE-2026-58218
Red Hat Samba: denial of service
Medium5.3CVE-2026-58218 · Published Jul 30, 2026
A flaw was found in Samba's internal DNS server where unauthenticated TKEY registration requests were added to the TKEY name cache before being rejected. A remote, unauthenticated attacker can exploit this behavior by sending a large number of TKEY requests with arbitrary names, exhausting the cache and evicting legitimate TKEY entries. This can prevent legitimate TSIG authentication for signed DNS queries, resulting in a denial of service.
Affected versions
| Package | Affected | Fixed in |
|---|---|---|
| Red Hat Enterprise Linux 10 Product | all versions | No fix yet |
| Red Hat Enterprise Linux 6 Product | all versions | No fix yet |
| all versions | No fix yet | |
| Red Hat Enterprise Linux 7 Product | all versions | No fix yet |
| Red Hat Enterprise Linux 8 Product | all versions | No fix yet |
| Red Hat Enterprise Linux 9 Product | all versions | No fix yet |
| Red Hat OpenShift Container Platform 4 Product | all versions | No fix yet |
Details and references
- CVSS 3.1
- CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
- Severity from
- the vendor (its own CVE record or advisory)
- Weakness
- CWE-410
More Red Hat advisories
All Red Hat| Date | Advisory | Severity | Fixed in |
|---|---|---|---|
| Jul 30 | ansible-collection-redhat-leapp: information disclosure | Medium6.2 | No fix yet |
| Jul 30 | ansible-collection-redhat-leapp.: insecure permissions | Medium5.5 | No fix yet |
| Jul 30 | Red Hat Samba: out-of-bounds read | Medium5.3 | No fix yet |
| Jul 30 | Red Hat Enterprise Linux 10: improper authorization | High8.8 | No fix yet |
| Jul 30 | Red Hat Cost Management Metrics Operator: server-side request forgery | High7.6 | No fix yet |
| Jul 30 | Red Hat Cost Management Metrics Operator: server-side request forgery | High7.6 | No fix yet |