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CVE-2026-64303

Linux Kernel use-after-free

9.8 CRITICALEPSS 0.69%
  1. Published25 Jul 2026

Description

In the Linux kernel, the following vulnerability has been resolved: spi: fsl-lpspi: terminate the RX channel on TX prepare failure path When dmaengine_prep_slave_sg() fails for the TX channel, the error path terminates the TX DMA channel but leaves the RX channel running. Since the RX channel was already submitted and issued prior to preparing the TX descriptor, returning -EINVAL causes the SPI core to unmap the DMA buffers while the RX DMA engine continues writing to them, leading to potential memory corruption or use-after-free. Terminate the RX channel before returning on the TX prepare failure path.

CVSS 3.1 breakdown

Attack vectorNetwork
Attack complexityLow
Privileges requiredNone
User interactionNone
ScopeUnchanged
ConfidentialityHigh
IntegrityHigh
AvailabilityHigh
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Affected products

Linux Kernel≥ 5.11 < 5.15.212 · ≥ 5.16 < 6.1.178 · ≥ 5.2 < 5.10.261 · ≥ 6.13 < 6.18.39

Remediation

Fixed in
Linux Kernel≥ 5.15.212

References

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Frequently asked

Is CVE-2026-64303 being actively exploited?

CVE-2026-64303 is not in the CISA KEV catalog. Its EPSS exploit probability is 0.69%.

How severe is CVE-2026-64303?

CVE-2026-64303 has a CVSS 3.1 base score of 9.8, rated critical. EPSS estimates a 0.69% probability of exploitation.

Which products are affected by CVE-2026-64303?

Affected products include Linux Kernel.

How do I fix CVE-2026-64303?

Upgrade affected software to a fixed version, for example Linux Kernel 5.15.212 or later, then confirm no affected versions remain in your inventory.

How Secuno handles this

Secuno correlates vulnerabilities like CVE-2026-64303 against the real software inventory on every managed device, as each hourly inventory arrives. Rather than a static severity, each match is scored in context: exploit availability, EPSS, the asset's exposure, and business criticality decide where it lands in the queue. If an affected version is present anywhere across your portfolio, it surfaces automatically with a prioritised remediation path.

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Data from the NVD, CISA KEV catalog and FIRST EPSS. CVSS 3.1 base score shown where available.