PT-2026-39125 · Linux · Linux Kernel

Published 2026-05-08 · Updated 2026-05-15 · CVE-2026-43464

Positive Technologies (AI Summary)

CVSS v3.1

7.5

High

Base vector

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

Name of the Vulnerable Software and Affected Versions Linux kernel (affected versions not specified)

Description An issue exists in the net/mlx5e component regarding XDP multi-buf fragment counting for legacy RQ. XDP multi-buf programs can modify the XDP buffer layout when calling bpf xdp pull data() or bpf xdp adjust tail(). A previous fix failed to properly count dropped fragments on the driver side, leading to page fragment reference counting errors. This can result in a negative pp ref count during page release, potentially causing a system warning or crash during operations such as changing the MTU.

Recommendations At the moment, there is no information about a newer version that contains a fix for this vulnerability.

Related Identifiers

CVE-2026-43464

Affected Products

Linux Kernel

References · 14

• https://osv.dev/vulnerability/DEBIAN-CVE-2026-43464 · Vendor Advisory
• https://ubuntu.com/security/CVE-2026-43464 · Vendor Advisory
• https://osv.dev/vulnerability/BELL-CVE-2026-43464 · Vendor Advisory
• https://git.kernel.org/stable/c/03cb50e5b74fce8bf6d92b860371b66253cf0f8d · Patch
• https://git.kernel.org/stable/c/c74557495efb4bd0adefdfc8678ecdbc82a06da3 · Patch
• https://git.kernel.org/stable/c/a6413e6f6c9d9bb9833324cb3753582f7bc0f2fa · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2026-43464 · Security Note
• https://cve.org/CVERecord?id=CVE-2026-43464 · Security Note
• https://osv.dev/vulnerability/UBUNTU-CVE-2026-43464 · Vendor Advisory
• https://security-tracker.debian.org/tracker/CVE-2026-43464 · Vendor Advisory
• https://twitter.com/hetmehtaa/status/2055151398283837677 · Twitter Post
• https://twitter.com/CVEnew/status/2052767598501400863 · Twitter Post
• https://git.kernel.org/linus/a6413e6f6c9d9bb9833324cb3753582f7bc0f2fa · Note
• https://docs.bell-sw.com/security/cves/CVE-2026-43464 · Note