CVE-2026-43336lib/crypto: chacha: Zeroize permuted_state before it leaves scope
- 7.5HighCVSS base score
- 0.43%Exploitation in 30 daysEPSS · top 63% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
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.
Timeline
ID reserved
By Linux
- 7 days later
· 7 days later
Published
- 3 months later
· 3 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | High7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N |
| NVDNVD · Analyzed | 3.1 | High7.5 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N |
- EPSS (exploitation in 30 days)
- 0.43% · top 63% of all CVEs (13 Nov 2026)
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 7.5.
Affected products
- affected c08d0e647305c3f8f640010a56c9e4bafb9488d3 – < e90ee961af515a484f091678ce58a4c3f7b73b02
- affected c08d0e647305c3f8f640010a56c9e4bafb9488d3 – < b416a4245f04a450c67a13e6d96056c37c5b33fe
- affected c08d0e647305c3f8f640010a56c9e4bafb9488d3 – < bd62d9b44464a6c20a34a74068e7a784d0afa04a
- affected c08d0e647305c3f8f640010a56c9e4bafb9488d3 – < 066c760acead1fb743bae294dbd89f479ae43b9b
- affected c08d0e647305c3f8f640010a56c9e4bafb9488d3 – < 1d761e5a7340c46479fb2399598f331e4fe2c633
- affected c08d0e647305c3f8f640010a56c9e4bafb9488d3 – < 1933249263c3a98df79992f61a566476e4163bcc
- affected c08d0e647305c3f8f640010a56c9e4bafb9488d3 – < 91999af43ca2125e3b2c18fcfc02912ada02efc3
- affected c08d0e647305c3f8f640010a56c9e4bafb9488d3 – < e5046823f8fa3677341b541a25af2fcb99a5b1e0
- affected 4.2
- unaffected < 4.2
- unaffected 5.10.253 – ≤ 5.10.*
- unaffected 5.15.203 – ≤ 5.15.*
- unaffected 6.1.169 – ≤ 6.1.*
- unaffected 6.6.135 – ≤ 6.6.*
- unaffected 6.12.82 – ≤ 6.12.*
- unaffected 6.18.22 – ≤ 6.18.*
- unaffected 6.19.12 – ≤ 6.19.*
- unaffected 7.0 – ≤ *
References
References8
- https://git.kernel.org/stable/c/e90ee961af515a484f091678ce58a4c3f7b73b02 (opens in a new tab)
- https://git.kernel.org/stable/c/b416a4245f04a450c67a13e6d96056c37c5b33fe (opens in a new tab)
- https://git.kernel.org/stable/c/bd62d9b44464a6c20a34a74068e7a784d0afa04a (opens in a new tab)
- https://git.kernel.org/stable/c/066c760acead1fb743bae294dbd89f479ae43b9b (opens in a new tab)
- https://git.kernel.org/stable/c/1d761e5a7340c46479fb2399598f331e4fe2c633 (opens in a new tab)
- https://git.kernel.org/stable/c/1933249263c3a98df79992f61a566476e4163bcc (opens in a new tab)
- https://git.kernel.org/stable/c/91999af43ca2125e3b2c18fcfc02912ada02efc3 (opens in a new tab)
- https://git.kernel.org/stable/c/e5046823f8fa3677341b541a25af2fcb99a5b1e0 (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-28620 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-43336)Record last updated .