CVE-2026-64055
net: ethernet: cortina: Carry over frag counter
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.
INFO
Published Date :
July 19, 2026, 4:17 p.m.
Last Modified :
July 20, 2026, 3:17 p.m.
Remotely Exploit :
Yes !
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Affected Products
The following products are affected by CVE-2026-64055
vulnerability.
Even if cvefeed.io is aware of the exact versions of the
products
that
are
affected, the information is not represented in the table below.
No affected product recoded yet
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | CRITICAL | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
Solution
- Update the Linux kernel to the latest version.
- Apply the specific patch for Cortina Ethernet driver.
- Verify the fragment counter logic is corrected.
- Test packet reassembly after the update.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-64055.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-64055 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-64055
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-64055 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-64055 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jul. 20, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H -
New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jul. 19, 2026
Action Type Old Value New Value Added Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88', 'lessThan': 'df31e3b64455293df1ea89c7da7d5c9bfbcdd253', 'versionType': 'git'}, {'status': 'affected', 'version': '4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88', 'lessThan': '7af1fabdee744b7995fe01b30b77dfc397657cb5', 'versionType': 'git'}, {'status': 'affected', 'version': '4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88', 'lessThan': '75105fcf73f1ce7d9f769aaefec6e6d6645d5ac0', 'versionType': 'git'}, {'status': 'affected', 'version': '4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88', 'lessThan': '78cf08b3be47c28f07008a76c932bad7cdffa9d8', 'versionType': 'git'}, {'status': 'affected', 'version': '4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88', 'lessThan': '7123cf481e21b54eb6adc4cb0d8dc2876aeaee41', 'versionType': 'git'}, {'status': 'affected', 'version': '4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88', 'lessThan': 'c373b34877afea61c89e0dd2e38948c624249b9b', 'versionType': 'git'}, {'status': 'affected', 'version': '4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88', 'lessThan': '46806096f35b8d3dfa2f321ddd77f597edcdb85f', 'versionType': 'git'}, {'status': 'affected', 'version': '4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88', 'lessThan': 'ebd8ec2b309e3a447851b456ccaf8fb39f3661e7', 'versionType': 'git'}], 'programFiles': ['drivers/net/ethernet/cortina/gemini.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '4.16'}, {'status': 'unaffected', 'version': '0', 'lessThan': '4.16', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '5.10.258', 'versionType': 'semver', 'lessThanOrEqual': '5.10.*'}, {'status': 'unaffected', 'version': '5.15.209', 'versionType': 'semver', 'lessThanOrEqual': '5.15.*'}, {'status': 'unaffected', 'version': '6.1.175', 'versionType': 'semver', 'lessThanOrEqual': '6.1.*'}, {'status': 'unaffected', 'version': '6.6.142', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.92', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.34', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.0.11', 'versionType': 'semver', 'lessThanOrEqual': '7.0.*'}, {'status': 'unaffected', 'version': '7.1', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['drivers/net/ethernet/cortina/gemini.c'], 'defaultStatus': 'affected'}] Added 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. Added Reference https://git.kernel.org/stable/c/46806096f35b8d3dfa2f321ddd77f597edcdb85f Added Reference https://git.kernel.org/stable/c/7123cf481e21b54eb6adc4cb0d8dc2876aeaee41 Added Reference https://git.kernel.org/stable/c/75105fcf73f1ce7d9f769aaefec6e6d6645d5ac0 Added Reference https://git.kernel.org/stable/c/78cf08b3be47c28f07008a76c932bad7cdffa9d8 Added Reference https://git.kernel.org/stable/c/7af1fabdee744b7995fe01b30b77dfc397657cb5 Added Reference https://git.kernel.org/stable/c/c373b34877afea61c89e0dd2e38948c624249b9b Added Reference https://git.kernel.org/stable/c/df31e3b64455293df1ea89c7da7d5c9bfbcdd253 Added Reference https://git.kernel.org/stable/c/ebd8ec2b309e3a447851b456ccaf8fb39f3661e7