CVE-2026-64303 (CVSS 9.8)

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.

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CVSS v3.1 Score

9.8

CRITICAL

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

EPSS — Exploit Prediction

0.0068

Probability of exploitation

0.49%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

References

Other References

https://git.kernel.org/stable/c/01980b5da56e573d62798d0ff6c86bcaa2b22cbe https://git.kernel.org/stable/c/808033d80d5c9f8adf7e8de9317389270ce13430 https://git.kernel.org/stable/c/9d000bdd250d649a11cd7f733175686877344582 https://git.kernel.org/stable/c/ad370d1c7a9a832f77b2341513cd31188c9443af https://git.kernel.org/stable/c/af39a2698f69b584d14a00cffe0f51a2caa15337 https://git.kernel.org/stable/c/cce2063404b2341e7b2bbf85eddfcd70a31a0033 https://git.kernel.org/stable/c/d5c1060218a3749c8a18b36f8169d910fce20639 https://git.kernel.org/stable/c/e65505d91fa036a238968e4c10744244d1b968c4

Frequently Asked Questions

What is CVE-2026-64303? +

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. It has a CVSS v3.1 base score of 9.8 (CRITICAL).

How severe is CVE-2026-64303? +

CVE-2026-64303 has a CVSS v3.1 score of 9.8 out of 10, rated CRITICAL. This is a critical vulnerability that should be patched immediately. The EPSS score is 0.0068, placing it in the 0th percentile for exploitation probability.

How do I check if I'm vulnerable to CVE-2026-64303? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

CVE-2026-64303