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Vulnerability record · CVE-2026-64055 · published 19 July 2026

CVE-2026-64055: Linux kernel vulnerability

Linux · Linux Kernel

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.

9.8 CVSS 3.1 Critical EPSS 0.51% · top 58.5%
9.8CVSS 3.1 base score
0.51%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
8References
2 Sep 2026Last modified by NVD

Description

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.

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

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://git.kernel.org/stable/c/46806096f35b8d3dfa2f321ddd77f597edcdb85f Patch
https://git.kernel.org/stable/c/7123cf481e21b54eb6adc4cb0d8dc2876aeaee41 Patch
https://git.kernel.org/stable/c/75105fcf73f1ce7d9f769aaefec6e6d6645d5ac0 Patch
https://git.kernel.org/stable/c/78cf08b3be47c28f07008a76c932bad7cdffa9d8 Patch
https://git.kernel.org/stable/c/7af1fabdee744b7995fe01b30b77dfc397657cb5 Patch
https://git.kernel.org/stable/c/c373b34877afea61c89e0dd2e38948c624249b9b Patch
https://git.kernel.org/stable/c/df31e3b64455293df1ea89c7da7d5c9bfbcdd253 Patch
https://git.kernel.org/stable/c/ebd8ec2b309e3a447851b456ccaf8fb39f3661e7 Patch

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Source: NIST National Vulnerability Database (record CVE-2026-64055), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.