What’s Vulnerable › Vulnerabilities

CVE-2026-97990: vdpa_sim_net: check TX pull result before RX copy

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-09-25 · updated 2026-10-19

Description

In the Linux kernel, the following vulnerability has been resolved: vdpa_sim_net: check TX pull result before RX copy vringh_iov_pull_iotlb() returns a signed byte count. A failed TX pull is currently added to the unsigned byte counter and then passed as a size_t length to receive_filter() and vringh_iov_push_iotlb(). A negative error can therefore become a large length in the RX path. Handle non-positive pull results before every length use. Count the TX error and complete the consumed TX descriptor with zero bytes. I found this bug myself, though the patch was written with AI assistance.

Affected products

• Linux kernel: 5.19 — fixed in 7.3

How to fix

Upgrade to a fixed version: Linux kernel 7.3. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/0d195797a80b77f2ec56718cd26d3ee65d0093e8
• https://git.kernel.org/stable/c/1b803d382cde6d85755b363f22010208a04ba40a
• https://git.kernel.org/stable/c/2bbf1c1f69991e28787e02b0a2f826289d5fc730
• https://git.kernel.org/stable/c/3af20238a09ca180d66623e3bed16b64e9975f39
• https://git.kernel.org/stable/c/c001abcde865b74231da8f1412c3217dbf66781e

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