CVE-2026-64304

Kernel memory corruption via oversized RSA CRT components

Published Jul 25, 2026 · Updated Jul 25, 2026

Buffer overflow in the QAT RSA driver in Linux Kernel allows local users to corrupt kernel memory via a crafted private key. qat_rsa_setkey_crt() right-aligns each CRT integer in a half-key DMA buffer without rejecting oversized components, so offset subtraction underflows and memcpy writes past the allocation. Reachability requires the Intel QAT asymmetric-crypto path; successful corruption can disclose or alter kernel data or interrupt the system.

CVSS severity7.8
High
EPSS probability0.17%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Buffer overflow in the QAT RSA driver in Linux Kernel allows local users to corrupt kernel memory via a crafted private key. qat_rsa_setkey_crt() right-aligns each CRT integer in a half-key DMA buffer without rejecting oversized components, so offset subtraction underflows and memcpy writes past the allocation. Reachability requires the Intel QAT asymmetric-crypto path; successful corruption can disclose or alter kernel data or interrupt the system.

The record

CVE
CVE-2026-64304
Published
Jul 25, 2026
Updated
Jul 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 25, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=4.8
  2. Affected versionversion=879f77e9071f029e1c9bd5a75814ecf51370f846 <1002719d13072a5e4be1e993aa61dffb4a604e82
  3. Affected versionversion=879f77e9071f029e1c9bd5a75814ecf51370f846 <3d61a214fdcda41f1ebfabbb483404032a7b4d91
  4. Affected versionversion=879f77e9071f029e1c9bd5a75814ecf51370f846 <500319830d76911c120dc0b9605f8c16d7702844
  5. Affected versionversion=879f77e9071f029e1c9bd5a75814ecf51370f846 <6d99c5fadd2df488103f64d6475b63ba6852202b
  6. Affected versionversion=879f77e9071f029e1c9bd5a75814ecf51370f846 <6fb62b767f3e27661e8f8d2f7b85f4e098fcdb1a
  7. Affected versionversion=879f77e9071f029e1c9bd5a75814ecf51370f846 <b3ac78756588059729b9195fcc9f4b37d54057a5
  8. Affected versionversion=879f77e9071f029e1c9bd5a75814ecf51370f846 <c34369473bfe92a0b46ec78d6358e30341c7f481
  9. Affected versionversion=879f77e9071f029e1c9bd5a75814ecf51370f846 <ce42224487c504aee4b7ff3a7342e7b4d7e28cc9

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=4.8; version=879f77e9071f029e1c9bd5a75814ecf51370f846 <1002719d13072a5e4be1e993aa61dffb4a604e82; version=879f77e9071f029e1c9bd5a75814ecf51370f846 <3d61a214fdcda41f1ebfabbb483404032a7b4d91; version=879f77e9071f029e1c9bd5a75814ecf51370f846 <500319830d76911c120dc0b9605f8c16d7702844; version=879f77e9071f029e1c9bd5a75814ecf51370f846 <6d99c5fadd2df488103f64d6475b63ba6852202b; version=879f77e9071f029e1c9bd5a75814ecf51370f846 <6fb62b767f3e27661e8f8d2f7b85f4e098fcdb1a; version=879f77e9071f029e1c9bd5a75814ecf51370f846 <b3ac78756588059729b9195fcc9f4b37d54057a5; version=879f77e9071f029e1c9bd5a75814ecf51370f846 <c34369473bfe92a0b46ec78d6358e30341c7f481; version=879f77e9071f029e1c9bd5a75814ecf51370f846 <ce42224487c504aee4b7ff3a7342e7b4d7e28cc9

Published CVSS scores

7.8kernel.orgCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1068Exploitation for Privilege Escalation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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