CVE-2026-64208
crypto/krb5, rxrpc: Fix lack of pre-decrypt/pre-verify length checks
Description
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.
INFO
Published Date :
July 24, 2026, 4:16 p.m.
Last Modified :
Aug. 12, 2026, 12:19 a.m.
Remotely Exploit :
Yes !
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
Solution
- Update the Linux kernel to include crypto library fixes.
- Ensure AF_RXRPC uses updated length validation for DATA packets.
- Verify pre-decrypt and pre-verify checks are correctly implemented.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-64208.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-64208 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-64208
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-64208 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-64208 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Aug. 12, 2026
Action Type Old Value New Value Added CWE NVD-CWE-noinfo Added CPE Configuration OR *cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:7.1:rc2:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:7.1:rc3:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:7.1:rc4:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.19 up to (excluding) 7.0.11 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.16 up to (excluding) 6.18.34 Added Reference Type kernel.org: https://git.kernel.org/stable/c/2b50aceafe6606ea52ed42aadd1b4d44a188aade Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/585f9f6aef5c4542ac9d6ec45cd7dbc7df9af3ff Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/9217017f4bce53dddb8d547837f1f707045d64ad Types: Patch -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jul. 27, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H -
New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jul. 24, 2026
Action Type Old Value New Value Added Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '9d1d2b59341f58126a69b51f9f5f8ccb9f12e54a', 'lessThan': '585f9f6aef5c4542ac9d6ec45cd7dbc7df9af3ff', 'versionType': 'git'}, {'status': 'affected', 'version': '9d1d2b59341f58126a69b51f9f5f8ccb9f12e54a', 'lessThan': '9217017f4bce53dddb8d547837f1f707045d64ad', 'versionType': 'git'}, {'status': 'affected', 'version': '9d1d2b59341f58126a69b51f9f5f8ccb9f12e54a', 'lessThan': '2b50aceafe6606ea52ed42aadd1b4d44a188aade', 'versionType': 'git'}], 'programFiles': ['Documentation/crypto/krb5.rst', 'crypto/krb5/krb5_api.c', 'include/crypto/krb5.h', 'include/trace/events/rxrpc.h', 'net/rxrpc/rxgk.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '6.16'}, {'status': 'unaffected', 'version': '0', 'lessThan': '6.16', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.18.34', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.0.11', 'versionType': 'semver', 'lessThanOrEqual': '7.0.*'}, {'status': 'unaffected', 'version': '7.1', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['Documentation/crypto/krb5.rst', 'crypto/krb5/krb5_api.c', 'include/crypto/krb5.h', 'include/trace/events/rxrpc.h', 'net/rxrpc/rxgk.c'], 'defaultStatus': 'affected'}] Added Description 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. Added Reference https://git.kernel.org/stable/c/2b50aceafe6606ea52ed42aadd1b4d44a188aade Added Reference https://git.kernel.org/stable/c/585f9f6aef5c4542ac9d6ec45cd7dbc7df9af3ff Added Reference https://git.kernel.org/stable/c/9217017f4bce53dddb8d547837f1f707045d64ad