lib/crypto: chacha: Zeroize permuted_state before it leaves scope

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Summary

CVECVE-2026-43336
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-08 14:16:43 UTC
Updated2026-05-11 08:16:10 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 7.5 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

EPSS: 0.000240000 probability, percentile 0.070400000 (date 2026-05-10)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
3.1CNADECLARED7.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
None
Availability
None

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected c08d0e647305c3f8f640010a56c9e4bafb9488d3 e90ee961af515a484f091678ce58a4c3f7b73b02 git Not specified
CNA Linux Linux affected c08d0e647305c3f8f640010a56c9e4bafb9488d3 b416a4245f04a450c67a13e6d96056c37c5b33fe git Not specified
CNA Linux Linux affected c08d0e647305c3f8f640010a56c9e4bafb9488d3 bd62d9b44464a6c20a34a74068e7a784d0afa04a git Not specified
CNA Linux Linux affected c08d0e647305c3f8f640010a56c9e4bafb9488d3 066c760acead1fb743bae294dbd89f479ae43b9b git Not specified
CNA Linux Linux affected c08d0e647305c3f8f640010a56c9e4bafb9488d3 1d761e5a7340c46479fb2399598f331e4fe2c633 git Not specified
CNA Linux Linux affected c08d0e647305c3f8f640010a56c9e4bafb9488d3 1933249263c3a98df79992f61a566476e4163bcc git Not specified
CNA Linux Linux affected c08d0e647305c3f8f640010a56c9e4bafb9488d3 91999af43ca2125e3b2c18fcfc02912ada02efc3 git Not specified
CNA Linux Linux affected c08d0e647305c3f8f640010a56c9e4bafb9488d3 e5046823f8fa3677341b541a25af2fcb99a5b1e0 git Not specified
CNA Linux Linux affected 4.2 Not specified
CNA Linux Linux unaffected 4.2 semver Not specified
CNA Linux Linux unaffected 5.10.253 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.203 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.169 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.135 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.82 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.22 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.12 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/e5046823f8fa3677341b541a25af2fcb99a5b1e0 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/e90ee961af515a484f091678ce58a4c3f7b73b02 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/1d761e5a7340c46479fb2399598f331e4fe2c633 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/bd62d9b44464a6c20a34a74068e7a784d0afa04a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/b416a4245f04a450c67a13e6d96056c37c5b33fe 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/91999af43ca2125e3b2c18fcfc02912ada02efc3 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/1933249263c3a98df79992f61a566476e4163bcc 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/066c760acead1fb743bae294dbd89f479ae43b9b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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