CVE-2026-64056
net: ethernet: cortina: Make RX SKB per-port
Description
In the Linux kernel, the following vulnerability has been resolved: net: ethernet: cortina: Make RX SKB per-port The SKB used to assemble packets from fragments in gmac_rx() is static local, but the Gemini has two ethernet ports, meaning there can be races between the ports on a bad day if a device is using both. Make the RX SKB a per-port variable and carry it over between invocations in the port struct instead. Zero the pointer once we call napi_gro_frags(), on error (after calling napi_free_frags()) or if the port is stopped. Zero 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-2026-64056
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 resolved version.
- Ensure RX SKB is a per-port variable.
- Zero the pointer after napi_gro_frags().
- Zero pointer on port stop or error.
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-2026-64056.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-64056 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-2026-64056
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-2026-64056 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-64056 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': '27856d533eca3804008695f61c1e4d5ff984196b', 'versionType': 'git'}, {'status': 'affected', 'version': '4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88', 'lessThan': 'b6b22824b30e48ce1df3a2e80990f4b8505deb50', 'versionType': 'git'}, {'status': 'affected', 'version': '4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88', 'lessThan': '6bba24e9ebe6f1c0b356cd471e36bdc7fa434897', 'versionType': 'git'}, {'status': 'affected', 'version': '4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88', 'lessThan': '3b249988d774dacf13b203817e971934a42243c4', 'versionType': 'git'}, {'status': 'affected', 'version': '4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88', 'lessThan': '72158ea185b27afae163949b0e86164cb6b64e55', 'versionType': 'git'}, {'status': 'affected', 'version': '4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88', 'lessThan': 'cfd62907f3cdbc3b6da8f49ba907c0390018fe5e', 'versionType': 'git'}, {'status': 'affected', 'version': '4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88', 'lessThan': '67a35e7da7ef9d2f000aa758552a128324c604a0', 'versionType': 'git'}, {'status': 'affected', 'version': '4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88', 'lessThan': '06937db21ee311ed07eba47954447245041a982d', '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: Make RX SKB per-port The SKB used to assemble packets from fragments in gmac_rx() is static local, but the Gemini has two ethernet ports, meaning there can be races between the ports on a bad day if a device is using both. Make the RX SKB a per-port variable and carry it over between invocations in the port struct instead. Zero the pointer once we call napi_gro_frags(), on error (after calling napi_free_frags()) or if the port is stopped. Zero 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/06937db21ee311ed07eba47954447245041a982d Added Reference https://git.kernel.org/stable/c/27856d533eca3804008695f61c1e4d5ff984196b Added Reference https://git.kernel.org/stable/c/3b249988d774dacf13b203817e971934a42243c4 Added Reference https://git.kernel.org/stable/c/67a35e7da7ef9d2f000aa758552a128324c604a0 Added Reference https://git.kernel.org/stable/c/6bba24e9ebe6f1c0b356cd471e36bdc7fa434897 Added Reference https://git.kernel.org/stable/c/72158ea185b27afae163949b0e86164cb6b64e55 Added Reference https://git.kernel.org/stable/c/b6b22824b30e48ce1df3a2e80990f4b8505deb50 Added Reference https://git.kernel.org/stable/c/cfd62907f3cdbc3b6da8f49ba907c0390018fe5e