CVE-2026-43336
lib/crypto: chacha: Zeroize permuted_state before it leaves scope
Description
In the Linux kernel, the following vulnerability has been resolved: lib/crypto: chacha: Zeroize permuted_state before it leaves scope Since the ChaCha permutation is invertible, the local variable 'permuted_state' is sufficient to compute the original 'state', and thus the key, even after the permutation has been done. While the kernel is quite inconsistent about zeroizing secrets on the stack (and some prominent userspace crypto libraries don't bother at all since it's not guaranteed to work anyway), the kernel does try to do it as a best practice, especially in cases involving the RNG. Thus, explicitly zeroize 'permuted_state' before it goes out of scope.
INFO
Published Date :
May 8, 2026, 2:16 p.m.
Last Modified :
May 8, 2026, 2:16 p.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Affected Products
The following products are affected by CVE-2026-43336
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
Solution
- Zeroize permuted_state before it leaves scope.
- Apply the patch to the Linux kernel.
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-2026-43336.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-43336 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-2026-43336
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-2026-43336 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-43336 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.
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New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
May. 08, 2026
Action Type Old Value New Value Added Description In the Linux kernel, the following vulnerability has been resolved: lib/crypto: chacha: Zeroize permuted_state before it leaves scope Since the ChaCha permutation is invertible, the local variable 'permuted_state' is sufficient to compute the original 'state', and thus the key, even after the permutation has been done. While the kernel is quite inconsistent about zeroizing secrets on the stack (and some prominent userspace crypto libraries don't bother at all since it's not guaranteed to work anyway), the kernel does try to do it as a best practice, especially in cases involving the RNG. Thus, explicitly zeroize 'permuted_state' before it goes out of scope. Added Reference https://git.kernel.org/stable/c/066c760acead1fb743bae294dbd89f479ae43b9b Added Reference https://git.kernel.org/stable/c/1933249263c3a98df79992f61a566476e4163bcc Added Reference https://git.kernel.org/stable/c/1d761e5a7340c46479fb2399598f331e4fe2c633 Added Reference https://git.kernel.org/stable/c/91999af43ca2125e3b2c18fcfc02912ada02efc3 Added Reference https://git.kernel.org/stable/c/b416a4245f04a450c67a13e6d96056c37c5b33fe Added Reference https://git.kernel.org/stable/c/bd62d9b44464a6c20a34a74068e7a784d0afa04a Added Reference https://git.kernel.org/stable/c/e5046823f8fa3677341b541a25af2fcb99a5b1e0 Added Reference https://git.kernel.org/stable/c/e90ee961af515a484f091678ce58a4c3f7b73b02