CVE-2025-39804

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Source
https://cve.org/CVERecord?id=CVE-2025-39804
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2025-39804.json
JSON Data
https://api.test.osv.dev/v1/vulns/CVE-2025-39804
Downstream
Published
2025-09-15T12:36:46.483Z
Modified
2026-03-11T05:37:18.083060Z
Summary
lib/crypto: arm64/poly1305: Fix register corruption in no-SIMD contexts
Details

In the Linux kernel, the following vulnerability has been resolved:

lib/crypto: arm64/poly1305: Fix register corruption in no-SIMD contexts

Restore the SIMD usability check that was removed by commit a59e5468a921 ("crypto: arm64/poly1305 - Add block-only interface").

This safety check is cheap and is well worth eliminating a footgun. While the Poly1305 functions should not be called when SIMD registers are unusable, if they are anyway, they should just do the right thing instead of corrupting random tasks' registers and/or computing incorrect MACs. Fixing this is also needed for poly1305_kunit to pass.

Just use mayusesimd() instead of the original cryptosimdusable(), since poly1305kunit won't rely on cryptosimddisabledfor_test.

Database specific 
{
    "cna_assigner": "Linux",
    "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2025/39xxx/CVE-2025-39804.json"
}
References

Affected packages

Git / git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

Affected ranges

Type
GIT
Repo
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
Events
Introduced
a59e5468a921937cb7317892779c67046ad9f5cc
Fixed
ef74efa598b7bbc5c24509f7f56af2806f81c339
Fixed
eec76ea5a7213c48529a46eed1b343e5cee3aaab

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/osv-output/CVE-2025-39804.json"