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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.

PUBLISHED Reserved 2026-05-01 | Published 2026-05-08 | Updated 2026-05-08 | Assigner Linux

Product status

Default status
unaffected

c08d0e647305c3f8f640010a56c9e4bafb9488d3 (git) before e90ee961af515a484f091678ce58a4c3f7b73b02
affected

c08d0e647305c3f8f640010a56c9e4bafb9488d3 (git) before b416a4245f04a450c67a13e6d96056c37c5b33fe
affected

c08d0e647305c3f8f640010a56c9e4bafb9488d3 (git) before bd62d9b44464a6c20a34a74068e7a784d0afa04a
affected

c08d0e647305c3f8f640010a56c9e4bafb9488d3 (git) before 066c760acead1fb743bae294dbd89f479ae43b9b
affected

c08d0e647305c3f8f640010a56c9e4bafb9488d3 (git) before 1d761e5a7340c46479fb2399598f331e4fe2c633
affected

c08d0e647305c3f8f640010a56c9e4bafb9488d3 (git) before 1933249263c3a98df79992f61a566476e4163bcc
affected

c08d0e647305c3f8f640010a56c9e4bafb9488d3 (git) before 91999af43ca2125e3b2c18fcfc02912ada02efc3
affected

c08d0e647305c3f8f640010a56c9e4bafb9488d3 (git) before e5046823f8fa3677341b541a25af2fcb99a5b1e0
affected

Default status
affected

4.2
affected

Any version before 4.2
unaffected

5.10.253 (semver)
unaffected

5.15.203 (semver)
unaffected

6.1.169 (semver)
unaffected

6.6.135 (semver)
unaffected

6.12.82 (semver)
unaffected

6.18.22 (semver)
unaffected

6.19.12 (semver)
unaffected

7.0 (original_commit_for_fix)
unaffected

References

git.kernel.org/...c/e90ee961af515a484f091678ce58a4c3f7b73b02

git.kernel.org/...c/b416a4245f04a450c67a13e6d96056c37c5b33fe

git.kernel.org/...c/bd62d9b44464a6c20a34a74068e7a784d0afa04a

git.kernel.org/...c/066c760acead1fb743bae294dbd89f479ae43b9b

git.kernel.org/...c/1d761e5a7340c46479fb2399598f331e4fe2c633

git.kernel.org/...c/1933249263c3a98df79992f61a566476e4163bcc

git.kernel.org/...c/91999af43ca2125e3b2c18fcfc02912ada02efc3

git.kernel.org/...c/e5046823f8fa3677341b541a25af2fcb99a5b1e0

cve.org (CVE-2026-43336)

nvd.nist.gov (CVE-2026-43336)

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