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CVE

CVE-2026-64055

net: ethernet: cortina: Carry over frag counter
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CVE

CVE-2026-64055

net: ethernet: cortina: Carry over frag counter

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

napigrofrags(), on error (after calling napifreefrags())

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.

Package Versions Affected

Package Version
patch Availability
No items found.

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CVSS Version

Severity
Base Score
CVSS Version
Score Vector
C
H
U
9.8
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
C
H
U
0
-
3.1
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
C
H
U
-

Related Resources

No items found.

References

https://git.kernel.org/stable/c/46806096f35b8d3dfa2f321ddd77f597edcdb85f, https://git.kernel.org/stable/c/7123cf481e21b54eb6adc4cb0d8dc2876aeaee41, https://git.kernel.org/stable/c/75105fcf73f1ce7d9f769aaefec6e6d6645d5ac0, https://git.kernel.org/stable/c/78cf08b3be47c28f07008a76c932bad7cdffa9d8, https://git.kernel.org/stable/c/7af1fabdee744b7995fe01b30b77dfc397657cb5, https://git.kernel.org/stable/c/c373b34877afea61c89e0dd2e38948c624249b9b, https://git.kernel.org/stable/c/df31e3b64455293df1ea89c7da7d5c9bfbcdd253, https://git.kernel.org/stable/c/ebd8ec2b309e3a447851b456ccaf8fb39f3661e7, https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/64xxx/CVE-2026-64055.json, https://nvd.nist.gov/vuln/detail/CVE-2026-64055, https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git

Severity

9.8

CVSS Score
0
10

Basic Information

Base CVSS
9.8
EPSS Probability
0.00514%
EPSS Percentile
0.41794%
Introduced Version
4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88,4.16.0,5.11.0,5.16.0,6.2.0,6.7.0,6.13.0,6.19.0,0
Fix Available
ebd8ec2b309e3a447851b456ccaf8fb39f3661e7,5.10.258,5.15.209,6.1.175,6.6.142,6.12.92,6.18.34,7.0.11,6.1.176-1,6.12.94-1,5.15.0-1112.119~20.04.1,5.15.0-1117.126~20.04.1,5.15.0-1117.126~20.04.2,5.15.0-1112.122~20.04.1,5.15.0-186.196~20.04.1,5.15.0-1106.110~20.04.1,5.15.0-1107.113~20.04.1,5.15.0-184.194~20.04.1,5.15.0-1064.66~20.04.1,5.15.0-1109.115~20.04.1,7.0.0-28.28~24.04.1,7.0.0-1016.16~24.04.1,7.0.0-28.28.1~24.04.3,5.15.0-186.196,5.15.0-1112.119,5.15.0-1117.126,5.15.0-1112.122,5.15.0-1108.114,5.15.0-1095.103,5.15.0-1106.110,5.15.0-1107.113,5.15.0-1104.109,5.15.0-184.194,5.15.0-1107.108,5.15.0-1064.66,5.15.0-1053.53,5.15.0-1109.115,5.15.0-1075.79

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