CVE-2026-43336
published 2026-05-08CVE-2026-43336: In the Linux kernel, the following vulnerability has been resolved: lib/crypto: chacha: Zeroize permuted_state before it leaves scope Since the ChaCha…
PriorityP340high7.5CVSS 3.1
AVNACLPRNUINSUCHINAN
EPSS
0.43%
34.5th percentile
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.
Affected
17 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| linux | linux | — | — |
| linux | linux | >= c08d0e647305c3f8f640010a56c9e4bafb9488d3 < e90ee961af515a484f091678ce58a4c3f7b73b02 | e90ee961af515a484f091678ce58a4c3f7b73b02 |
| linux | linux | >= c08d0e647305c3f8f640010a56c9e4bafb9488d3 < b416a4245f04a450c67a13e6d96056c37c5b33fe | b416a4245f04a450c67a13e6d96056c37c5b33fe |
| linux | linux | >= c08d0e647305c3f8f640010a56c9e4bafb9488d3 < bd62d9b44464a6c20a34a74068e7a784d0afa04a | bd62d9b44464a6c20a34a74068e7a784d0afa04a |
| linux | linux | >= c08d0e647305c3f8f640010a56c9e4bafb9488d3 < 066c760acead1fb743bae294dbd89f479ae43b9b | 066c760acead1fb743bae294dbd89f479ae43b9b |
| linux | linux | >= c08d0e647305c3f8f640010a56c9e4bafb9488d3 < 1d761e5a7340c46479fb2399598f331e4fe2c633 | 1d761e5a7340c46479fb2399598f331e4fe2c633 |
| linux | linux | >= c08d0e647305c3f8f640010a56c9e4bafb9488d3 < 1933249263c3a98df79992f61a566476e4163bcc | 1933249263c3a98df79992f61a566476e4163bcc |
| linux | linux | >= c08d0e647305c3f8f640010a56c9e4bafb9488d3 < 91999af43ca2125e3b2c18fcfc02912ada02efc3 | 91999af43ca2125e3b2c18fcfc02912ada02efc3 |
| linux | linux | >= c08d0e647305c3f8f640010a56c9e4bafb9488d3 < e5046823f8fa3677341b541a25af2fcb99a5b1e0 | e5046823f8fa3677341b541a25af2fcb99a5b1e0 |
| linux | linux_kernel | — | — |
| linux | linux_kernel | >= 4.2 < 5.10.253 | 5.10.253 |
| linux | linux_kernel | >= 5.11 < 5.15.203 | 5.15.203 |
| linux | linux_kernel | >= 5.16 < 6.1.169 | 6.1.169 |
| linux | linux_kernel | >= 6.13 < 6.18.22 | 6.18.22 |
| linux | linux_kernel | >= 6.19 < 6.19.12 | 6.19.12 |
| linux | linux_kernel | >= 6.2 < 6.6.135 | 6.6.135 |
| linux | linux_kernel | >= 6.7 < 6.12.82 | 6.12.82 |
CVSS provenance
nvdv3.17.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
vendor_redhat7.5HIGH
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VulDB
Linux Kernel up to 6.19.11 permuted_state stack-based overflow (Nessus ID 316948 / WID-SEC-2026-1454)
vuldb·2026-06-18·CVSS 7.5
CVE-2026-43336 [HIGH] Linux Kernel up to 6.19.11 permuted_state stack-based overflow (Nessus ID 316948 / WID-SEC-2026-1454)
A vulnerability was found in Linux Kernel up to 6.19.11 and classified as critical. Affected by this vulnerability is the function permuted_state. The manipulation results in stack-based buffer overflow.
This vulnerability is reported as CVE-2026-43336. The attacker must have access to the local network to execute the attack. No exploit exists.
It is suggested to upgrade the affected component.
GHSA
GHSA-cw2x-g67m-8387: In the Linux kernel, the following vulnerability has been resolved:
lib/crypto: chacha: Zeroize permuted_state before it leaves scope
Since the ChaC
ghsa_unreviewed·2026-05-08
CVE-2026-43336 GHSA-cw2x-g67m-8387: In the Linux kernel, the following vulnerability has been resolved:
lib/crypto: chacha: Zeroize permuted_state before it leaves scope
Since the ChaC
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.
Red Hat
kernel: lib/crypto: chacha: Zeroize permuted_state before it leaves scope
vendor_redhat·2026-05-08·CVSS 7.5
CVE-2026-43336 [HIGH] CWE-212 kernel: lib/crypto: chacha: Zeroize permuted_state before it leaves scope
kernel: lib/crypto: chacha: Zeroize permuted_state before it leaves scope
A flaw was found in the Linux kernel's ChaCha cryptographic algorithm implementation. The `permuted_state` local variable, which is sufficient to compute the original cryptographic key, was not properly zeroized before leaving its scope. This oversight could allow an attacker to recover the cryptographic key, leading to information disclosure.
Package: kernel (Red Hat Enterprise Linux 10) - Not affected
Package: kernel (Red Hat Enterprise Linux 6) - Not affected
Package: kernel (Red Hat Enterprise Linux 7) - Not affected
Package: kernel-rt (Red Hat Enterprise Linux 7) - Not affected
Package: kernel (Red Hat Enterprise Linux 8) - Not affected
Package: kernel-rt (Red Hat Enterprise Linux 8) - Not affected
Packa
No detection rules found.
No public exploits indexed.
https://git.kernel.org/stable/c/066c760acead1fb743bae294dbd89f479ae43b9bhttps://git.kernel.org/stable/c/1933249263c3a98df79992f61a566476e4163bcchttps://git.kernel.org/stable/c/1d761e5a7340c46479fb2399598f331e4fe2c633https://git.kernel.org/stable/c/91999af43ca2125e3b2c18fcfc02912ada02efc3https://git.kernel.org/stable/c/b416a4245f04a450c67a13e6d96056c37c5b33fehttps://git.kernel.org/stable/c/bd62d9b44464a6c20a34a74068e7a784d0afa04ahttps://git.kernel.org/stable/c/e5046823f8fa3677341b541a25af2fcb99a5b1e0https://git.kernel.org/stable/c/e90ee961af515a484f091678ce58a4c3f7b73b02
2026-05-08
Published