High [CVE-2026-64208] crypto/krb5, rxrpc: Fix lack of pre-decrypt/pre-verify length checks
This high-severity Red Hat Linux advisory covers CVE-2026-64208 affecting Red Hat Enterprise Linux 10, Red Hat package: kernel.
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Summary
In the Linux kernel, the following vulnerability has been resolved: crypto/krb5, rxrpc: Fix lack of pre-decrypt/pre-verify length checks Change the krb5 crypto library to provide facilities to precheck the length of the message about to be decrypted or verified. Fix AF_RXRPC to make use of this to validate DATA packets secured with RxGK.
This vulnerability arises from a lack of proper length checks before decrypting or verifying incoming messages. A remote attacker could exploit this by sending specially crafted messages, leading to a Denial of Service (DoS) condition where the system becomes unavailable.
This vulnerability is rated as having a Moderate impact by Red Hat because successful exploitation requires an active RxRPC session utilizing the RxGK security mechanism, limiting exposure to specialized deployments.
While processing improperly bounded incoming network packets can cause a denial of service, the underlying networking and cryptographic support is not utilized by default. In addition, older enterprise releases, including Red Hat Enterprise Linux 8 and 9, do not incorporate the vulnerable code and remain unaffected.
Red Hat severity: Moderate — CVSS 7 (CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H). Weakness: CWE-120.
Affected Red Hat products: Red Hat Enterprise Linux 10. Red Hat does not currently list a fixing RHSA for this CVE.
Affected versions
No affected-version range was extracted from the source record. The vendor advisory is authoritative. Check it before change work.
Official advisory · medium-confidence parse· fetched 1 day ago·verify at source
Fixed versions
No fixed release is recorded yet. That does not prove no patch exists. Confirm against the vendor advisory.
Official advisory · medium-confidence parse· fetched 1 day ago·verify at source
Mitigation
The source record does not include mitigation steps. That does not mean no fix exists. Read the vendor advisory below for the authoritative guidance.
Official advisory · medium-confidence parse· fetched 1 day ago·verify at source
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