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.
Metrics
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:HAffected software
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux | >= 4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88, < df31e3b64455293df1ea89c7da7d5c9bfbcdd253; >= 4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88, < 7af1fabdee744b7995fe01b30b77dfc397657cb5; >= 4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88, < 75105fcf73f1ce7d9f769aaefec6e6d6645d5ac0; >= 4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88, < 78cf08b3be47c28f07008a76c932bad7cdffa9d8; >= 4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88, < 7123cf481e21b54eb6adc4cb0d8dc2876aeaee41; >= 4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88, < c373b34877afea61c89e0dd2e38948c624249b9b; >= 4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88, < 46806096f35b8d3dfa2f321ddd77f597edcdb85f; >= 4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88, < ebd8ec2b309e3a447851b456ccaf8fb39f3661e7 |
| Linux | Linux | 4.16 |
References
- https://git.kernel.org/stable/c/46806096f35b8d3dfa2f321ddd77f597edcdb85fPatch
- https://git.kernel.org/stable/c/7123cf481e21b54eb6adc4cb0d8dc2876aeaee41Patch
- https://git.kernel.org/stable/c/75105fcf73f1ce7d9f769aaefec6e6d6645d5ac0Patch
- https://git.kernel.org/stable/c/78cf08b3be47c28f07008a76c932bad7cdffa9d8Patch
- https://git.kernel.org/stable/c/7af1fabdee744b7995fe01b30b77dfc397657cb5Patch
- https://git.kernel.org/stable/c/c373b34877afea61c89e0dd2e38948c624249b9bPatch
- https://git.kernel.org/stable/c/df31e3b64455293df1ea89c7da7d5c9bfbcdd253Patch
- https://git.kernel.org/stable/c/ebd8ec2b309e3a447851b456ccaf8fb39f3661e7Patch
Timeline
- Published
- Jul 19, 2026
- Last modified
- Sep 2, 2026
- NVD status
- Analyzed