PT-2026-61372 · Linux · Linux

CVE-2026-64055 · Published 2026-07-19 · Updated 2026-07-19

NVD

CVSS v3.1

9.8

Critical

Base vector

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

In the Linux kernel, the following vulnerability has been resolved:

net: ethernet: cortina: Carry over frag counter

The gmac rx() NAPI poll function assembles packets in an SKB from a ring buffer.

If the ring buffer gets completely emptied during a poll cycle, we exit gmac rx(), but the packet is not yet completely assembled in the SKB, yet the fragment counter frag nr is reset to zero on the next invocation.

Solve this by making the RX fragment counter a part of the port struct, and carry it over between invocations.

Reset the fragment counter only right after calling napi gro frags(), on error (after calling napi free frags()) or if stopping the port.

Reset it in some place where not strictly necessary just to emphasize what is going on.

This was found by Sashiko during normal patch review.

Fix

Related Identifiers

CVE-2026-64055

Affected Products

Linux

References · 9

• https://nvd.nist.gov/vuln/detail/CVE-2026-64055 · Security Note
• https://git.kernel.org/stable/c/78cf08b3be47c28f07008a76c932bad7cdffa9d8 · Note
• https://git.kernel.org/stable/c/7123cf481e21b54eb6adc4cb0d8dc2876aeaee41 · Note
• https://git.kernel.org/stable/c/46806096f35b8d3dfa2f321ddd77f597edcdb85f · Note
• https://git.kernel.org/stable/c/c373b34877afea61c89e0dd2e38948c624249b9b · Note
• https://git.kernel.org/stable/c/df31e3b64455293df1ea89c7da7d5c9bfbcdd253 · Note
• https://git.kernel.org/stable/c/75105fcf73f1ce7d9f769aaefec6e6d6645d5ac0 · Note
• https://git.kernel.org/stable/c/ebd8ec2b309e3a447851b456ccaf8fb39f3661e7 · Note
• https://git.kernel.org/stable/c/7af1fabdee744b7995fe01b30b77dfc397657cb5 · Note