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CVE-2026-64304: In the Linux kernel, the following vulnerability has been resolved: crypto: qat - validate RSA CRT component

34
Routine
HIGH 7.8WATCHLISTUPGRADE

CVE-2026-64304 is a high-severity flaw (CVSS 7.8) affecting linux kernel. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

In the Linux kernel, the following vulnerability has been resolved: crypto: qat - validate RSA CRT component lengths The generic RSA key parser (rsa_helper.c) bounds each CRT component (p, q, dp, dq, qinv) by the modulus size n_sz, but qat_rsa_setkey_crt() allocates half-size DMA buffers (key_sz / 2) and right-aligns each component with: memcpy(dst + half_key_sz - len, src, len) When a CRT component is larger than half_key_sz the subtract

Why this priority

  • High severity
  • On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score7.8 (High)
Attack vectorLocal
Attack complexityLow
Privileges neededLow
User interactionNone
EPSS exploit chance0.2% (top 94%)
CISA exploited listNo
WeaknessCWE-787
Published2026-07-25
Last modified2026-10-24
Publisher (CNA): kernel.org · Vendor: linux

Last updated 2026-10-24 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

linux linux kernel UPGRADE
Affected: >= 4.8 and < 5.10.261 · >= 5.11 and < 5.15.212 · >= 5.16 and < 6.1.178 · >= 6.2 and < 6.6.145 · >= 6.7 and < 6.12.96 · >= 6.13 and < 6.18.39 · >= 6.19 and < 7.1.4
Fixed in: 5.10.261, 5.15.212, 6.1.178, 6.6.145, 6.12.96, 6.18.39, 7.1.4
Safe to downgrade to: no unaffected older release
Check your OS release
cat /etc/os-release; uname -r
Debian / Ubuntu
sudo apt update && sudo apt full-upgrade
RHEL / Amazon Linux / Fedora
sudo dnf upgrade --refresh
Windows
Install the latest cumulative update from Windows Update
If no patch exists yet
OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Exact fixes by distribution

Fedora 46 · sugar-abacus · FIXED · 61-18.fc46 · FEDORA-2026-b1e9de9204 · source
sudo dnf upgrade --advisory=FEDORA-2026-b1e9de9204
Fedora ELN · selinux-policy · FIXED · 45.23-1.eln159 · FEDORA-2026-3668c969a2 · source
sudo dnf upgrade --advisory=FEDORA-2026-3668c969a2
Debian 12 · linux · FIXED · 6.1.180-1
sudo apt update && sudo apt install --only-upgrade linux dpkg --compare-versions "$(dpkg-query -W -f='${Version}' linux)" ge "6.1.180-1" && echo PATCHED || echo STILL-VULNERABLE
Debian 13 · linux · FIXED · 6.12.96-1
sudo apt update && sudo apt install --only-upgrade linux dpkg --compare-versions "$(dpkg-query -W -f='${Version}' linux)" ge "6.12.96-1" && echo PATCHED || echo STILL-VULNERABLE
Debian 12 · linux-6.12 · FIXED · 6.12.100-1~deb12u1
sudo apt update && sudo apt install --only-upgrade linux-6.12 dpkg --compare-versions "$(dpkg-query -W -f='${Version}' linux-6.12)" ge "6.12.100-1~deb12u1" && echo PATCHED || echo STILL-VULNERABLE
RHEL 10 · kernel · FIXED · kernel-6.12.0-211.50.1.el10_2
sudo dnf upgrade --advisory=RHSA-2026:61887 rpm -q kernel
RHEL 10.0 Extended Update Support · kernel · FIXED · kernel-6.12.0-55.103.1.el10_0
sudo dnf upgrade --advisory=RHSA-2026:64767 rpm -q kernel
RHEL 9 · kernel · FIXED · kernel-5.14.0-687.44.1.el9_8
sudo dnf upgrade --advisory=RHSA-2026:63129 rpm -q kernel
RHEL 9.2 Update Services for SAP Solutions · kernel · FIXED · kernel-5.14.0-284.191.1.el9_2
sudo dnf upgrade --advisory=RHSA-2026:67723 rpm -q kernel
RHEL 9.2 Update Services for SAP Solutions · kernel-rt · FIXED · kernel-rt-5.14.0-284.191.1.rt14.476.el9_2
sudo dnf upgrade --advisory=RHSA-2026:67721 rpm -q kernel-rt
Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-64304?

linux kernel: upgrade to 5.10.261, 5.15.212, 6.1.178, 6.6.145, 6.12.96, 6.18.39, 7.1.4. Exact commands for each OS are on this page.

Is CVE-2026-64304 being exploited?

CVE-2026-64304 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-64304 affect?

CVE-2026-64304 affects linux kernel. Severity is high (CVSS 7.8). In the Linux kernel, the following vulnerability has been resolved: crypto: qat - validate RSA CRT component lengths The generic RSA key parser (rsa_helper.c) bounds each CRT component (p, q, dp, dq, qinv) by the modulus size n_sz, but qa

How urgent is CVE-2026-64304?

Priority 34/100. High severity; On your watchlist

Software pages

Linux kernel vulnerabilities

Related CVEs

References

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