CVE-2026-64313
Linux kernel ECC carry bug causes incorrect ECC operations.
Is CVE-2026-64313 being exploited?
Not confirmed. CVE-2026-64313 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.35% probability of exploitation in the next 30 days.
How severe is CVE-2026-64313?
CVE-2026-64313 is rated High with a CVSS score of 8.8. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-64313?
Yes. A fix has been recorded for CVE-2026-64313. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-64313 affect?
CVE-2026-64313 affects Linux kernel (crypto/ecc.c), Distributions using affected kernel versions, Kernel consumers of ECDH/ECDSA (AF_ALG, TLS drivers). Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-64313?
Install vendor kernel updates, reboot hosts, and update crypto-dependent services.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Faulty ECDH/ECDSA math can produce bad keys, cause signature verification failures, or enable cryptographic forgery/compromise of key material.
Patch when possible
- affected>= 3c4b23901a0c766879dff680cd6bdab47bcdbbd2 and < d11b2bb99bec1f5557c01cac42231e23745f49b8
- affected>= 3c4b23901a0c766879dff680cd6bdab47bcdbbd2 and < b709e0e768766abe29a49e1c1922a1604be602f4
- affected>= 3c4b23901a0c766879dff680cd6bdab47bcdbbd2 and < 24a54dfa06d09813b4802a374fad3d2c0e16a884
- affected>= 3c4b23901a0c766879dff680cd6bdab47bcdbbd2 and < 677450e5ef850c4d28b7956aa01104548c2a894e
- affected>= 3c4b23901a0c766879dff680cd6bdab47bcdbbd2 and < 5275e0fca256d081e2e7d4ba3dd8216c6e50d44e
- affected>= 3c4b23901a0c766879dff680cd6bdab47bcdbbd2 and < 774ddddf5eb26eeca177350413e3e2bc50930ee9
- affected>= 3c4b23901a0c766879dff680cd6bdab47bcdbbd2 and < ebaae7c4251cc0cdb2602f334d4f08a3e82d271e
- affected>= 3c4b23901a0c766879dff680cd6bdab47bcdbbd2 and < 27b536a2ec8e2f85a0380c2d13c9ecbc7aaab406
- affected4.8
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.