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NVD / CVE Program· CNA Linux

CVE-2026-64304: crypto: qat - validate RSA CRT component lengths

Noroxi assessment

Priority: Monitor (action score 31/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.16% (FIRST EPSS).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Linux Linux 1002719d13072a5e4be1e993aa61dffb4a604e82, 3d61a214fdcda41f1ebfabbb483404032a7b4d91, 500319830d76911c120dc0b9605f8c16d7702844.

Low priority for now. Upgrade to Linux Linux 1002719d13072a5e4be1e993aa61dffb4a604e82, 3d61a214fdcda41f1ebfabbb483404032a7b4d91, 500319830d76911c120dc0b9605f8c16d7702844 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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 subtraction underflows and memcpy writes past the DMA buffer, causing memory corruption. Add a len > half_key_sz check next to the existing !len check for each of the five CRT components so the driver falls back to the non-CRT path instead of writing out of bounds.

HighCVSS 7.8 · v3.1—No exploit Fix available
Published
Jul 25, 2026
Updated
Oct 24, 2026
EPSS
0.1% · 6th percentile

Report tools

JSON

Action score

31

Monitor

Low priority for now.

CVSS
31 / 40 · 7.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · Linux
7.8
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

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When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
linuxlinux kernel

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • linux linux kernel4.8 and later · before 5.10.261
  • linux linux kernel5.11 and later · before 5.15.212
  • linux linux kernel5.16 and later · before 6.1.178
  • linux linux kernel6.2 and later · before 6.6.145
  • linux linux kernel6.7 and later · before 6.12.96
  • linux linux kernel6.13 and later · before 6.18.39
  • linux linux kernel6.19 and later · before 7.1.4

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 4.8affected
    • 879f77e9071f029e1c9bd5a75814ecf51370f846 and later · before 6d99c5fadd2df488103f64d6475b63ba6852202baffected · git
    • 879f77e9071f029e1c9bd5a75814ecf51370f846 and later · before c34369473bfe92a0b46ec78d6358e30341c7f481affected · git
    • 879f77e9071f029e1c9bd5a75814ecf51370f846 and later · before 1002719d13072a5e4be1e993aa61dffb4a604e82affected · git
    • 879f77e9071f029e1c9bd5a75814ecf51370f846 and later · before 500319830d76911c120dc0b9605f8c16d7702844affected · git
    • 879f77e9071f029e1c9bd5a75814ecf51370f846 and later · before 3d61a214fdcda41f1ebfabbb483404032a7b4d91affected · git
    • 879f77e9071f029e1c9bd5a75814ecf51370f846 and later · before 6fb62b767f3e27661e8f8d2f7b85f4e098fcdb1aaffected · git
    • 879f77e9071f029e1c9bd5a75814ecf51370f846 and later · before ce42224487c504aee4b7ff3a7342e7b4d7e28cc9affected · git
    • 879f77e9071f029e1c9bd5a75814ecf51370f846 and later · before b3ac78756588059729b9195fcc9f4b37d54057a5affected · git
    • before 4.8not affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
AlmaLinux:9kernelbefore 5.14.0-687.44.1.el9_85.14.0-687.44.1.el9_8
AlmaLinux:9kernel-64kbefore 5.14.0-687.44.1.el9_85.14.0-687.44.1.el9_8
AlmaLinux:9kernel-64k-corebefore 5.14.0-687.44.1.el9_85.14.0-687.44.1.el9_8
AlmaLinux:9kernel-64k-debugbefore 5.14.0-687.44.1.el9_85.14.0-687.44.1.el9_8
AlmaLinux:9kernel-64k-debug-corebefore 5.14.0-687.44.1.el9_85.14.0-687.44.1.el9_8
AlmaLinux:9kernel-64k-debug-develbefore 5.14.0-687.44.1.el9_85.14.0-687.44.1.el9_8
AlmaLinux:9kernel-64k-debug-devel-matchedbefore 5.14.0-687.44.1.el9_85.14.0-687.44.1.el9_8
AlmaLinux:9kernel-64k-debug-modulesbefore 5.14.0-687.44.1.el9_85.14.0-687.44.1.el9_8
AlmaLinux:9kernel-64k-debug-modules-corebefore 5.14.0-687.44.1.el9_85.14.0-687.44.1.el9_8
AlmaLinux:9kernel-64k-debug-modules-extrabefore 5.14.0-687.44.1.el9_85.14.0-687.44.1.el9_8
AlmaLinux:9kernel-64k-develbefore 5.14.0-687.44.1.el9_85.14.0-687.44.1.el9_8
AlmaLinux:9kernel-64k-devel-matchedbefore 5.14.0-687.44.1.el9_85.14.0-687.44.1.el9_8
AlmaLinux:9kernel-64k-modulesbefore 5.14.0-687.44.1.el9_85.14.0-687.44.1.el9_8
AlmaLinux:9kernel-64k-modules-corebefore 5.14.0-687.44.1.el9_85.14.0-687.44.1.el9_8
AlmaLinux:9kernel-64k-modules-extrabefore 5.14.0-687.44.1.el9_85.14.0-687.44.1.el9_8
AlmaLinux:9kernel-abi-stablelistsbefore 5.14.0-687.44.1.el9_85.14.0-687.44.1.el9_8
AlmaLinux:9kernel-corebefore 5.14.0-687.44.1.el9_85.14.0-687.44.1.el9_8
AlmaLinux:9kernel-cross-headersbefore 5.14.0-687.44.1.el9_85.14.0-687.44.1.el9_8
AlmaLinux:9kernel-debugbefore 5.14.0-687.44.1.el9_85.14.0-687.44.1.el9_8
AlmaLinux:9kernel-debug-corebefore 5.14.0-687.44.1.el9_85.14.0-687.44.1.el9_8
AlmaLinux:9kernel-debug-develbefore 5.14.0-687.44.1.el9_85.14.0-687.44.1.el9_8
AlmaLinux:9kernel-debug-devel-matchedbefore 5.14.0-687.44.1.el9_85.14.0-687.44.1.el9_8
AlmaLinux:9kernel-debug-modulesbefore 5.14.0-687.44.1.el9_85.14.0-687.44.1.el9_8
AlmaLinux:9kernel-debug-modules-corebefore 5.14.0-687.44.1.el9_85.14.0-687.44.1.el9_8

+96

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV
    90Now
  • CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe KEV
    89Now
  • CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV
    85Now

Published before and after this one in the same product

  • ← EarlierCVE-2026-64299Jul 25, 2026 · tracing: Prevent out-of-bounds read in glob matching
    28Monitor
  • ← EarlierCVE-2026-64303Jul 25, 2026 · spi: fsl-lpspi: terminate the RX channel on TX prepare failure path
    39Monitor
  • Later →CVE-2026-64305Jul 25, 2026 · crypto: qat - protect service table iterations with service_lock
    31Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux1002719d13072a5e4be1e993aa61dffb4a604e82Vendor (CNA)
Linux Linux3d61a214fdcda41f1ebfabbb483404032a7b4d91Vendor (CNA)
Linux Linux500319830d76911c120dc0b9605f8c16d7702844Vendor (CNA)
Linux Linux6d99c5fadd2df488103f64d6475b63ba6852202bVendor (CNA)
Linux Linux6fb62b767f3e27661e8f8d2f7b85f4e098fcdb1aVendor (CNA)
Linux Linuxb3ac78756588059729b9195fcc9f4b37d54057a5Vendor (CNA)
Linux Linuxc34369473bfe92a0b46ec78d6358e30341c7f481Vendor (CNA)
Linux Linuxce42224487c504aee4b7ff3a7342e7b4d7e28cc9Vendor (CNA)
almalinux:kernel5.14.0-687.44.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k5.14.0-687.44.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-core5.14.0-687.44.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug5.14.0-687.44.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-core5.14.0-687.44.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-devel5.14.0-687.44.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-devel-matched5.14.0-687.44.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-modules5.14.0-687.44.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-modules-core5.14.0-687.44.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-modules-extra5.14.0-687.44.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-devel5.14.0-687.44.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-devel-matched5.14.0-687.44.1.el9_8 · AlmaLinux:9Package registry (OSV)
debian:linux6.1.180-1 · Debian:12Package registry (OSV)
debian:linux-6.126.12.100-1~deb12u1 · Debian:12Package registry (OSV)
red hat:kernel-64k-debug-debuginfo0:5.14.0-570.138.1.el9_6 · Red Hat:rhel_eus:9.6::appstreamPackage registry (OSV)
red hat:kernel-64k-debug-devel0:5.14.0-570.138.1.el9_6 · Red Hat:rhel_eus:9.6::appstreamPackage registry (OSV)
red hat:kernel-64k-debug-devel-matched0:5.14.0-570.138.1.el9_6 · Red Hat:rhel_eus:9.6::appstreamPackage registry (OSV)
red hat:kernel-64k-debuginfo0:5.14.0-570.138.1.el9_6 · Red Hat:rhel_eus:9.6::appstreamPackage registry (OSV)
red hat:kernel-64k-devel0:5.14.0-570.138.1.el9_6 · Red Hat:rhel_eus:9.6::appstreamPackage registry (OSV)
red hat:kernel-64k-devel-matched0:5.14.0-570.138.1.el9_6 · Red Hat:rhel_eus:9.6::appstreamPackage registry (OSV)
red hat:kernel-debug-debuginfo0:5.14.0-570.138.1.el9_6 · Red Hat:rhel_eus:9.6::appstreamPackage registry (OSV)
red hat:kernel-debug-devel0:5.14.0-570.138.1.el9_6 · Red Hat:rhel_eus:9.6::appstreamPackage registry (OSV)

+5

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-787 · Out-of-bounds Write

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. SSVC exploitation— → none
  2. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (7 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records