net: ethernet: cortina: Carry over frag counter

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-64055
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-07-19 16:17:45 UTC
Updated2026-07-20 15:17:05 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 9.8 CRITICAL from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

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

EPSS: 0.001760000 probability, percentile 0.073870000 (date 2026-07-20)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED9.8CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88 df31e3b64455293df1ea89c7da7d5c9bfbcdd253 git Not specified
CNA Linux Linux affected 4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88 7af1fabdee744b7995fe01b30b77dfc397657cb5 git Not specified
CNA Linux Linux affected 4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88 75105fcf73f1ce7d9f769aaefec6e6d6645d5ac0 git Not specified
CNA Linux Linux affected 4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88 78cf08b3be47c28f07008a76c932bad7cdffa9d8 git Not specified
CNA Linux Linux affected 4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88 7123cf481e21b54eb6adc4cb0d8dc2876aeaee41 git Not specified
CNA Linux Linux affected 4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88 c373b34877afea61c89e0dd2e38948c624249b9b git Not specified
CNA Linux Linux affected 4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88 46806096f35b8d3dfa2f321ddd77f597edcdb85f git Not specified
CNA Linux Linux affected 4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88 ebd8ec2b309e3a447851b456ccaf8fb39f3661e7 git Not specified
CNA Linux Linux affected 4.16 Not specified
CNA Linux Linux unaffected 4.16 semver Not specified
CNA Linux Linux unaffected 5.10.258 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.209 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.175 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.142 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.92 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.34 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.11 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/75105fcf73f1ce7d9f769aaefec6e6d6645d5ac0 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/7af1fabdee744b7995fe01b30b77dfc397657cb5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/78cf08b3be47c28f07008a76c932bad7cdffa9d8 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/46806096f35b8d3dfa2f321ddd77f597edcdb85f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/c373b34877afea61c89e0dd2e38948c624249b9b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/df31e3b64455293df1ea89c7da7d5c9bfbcdd253 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/ebd8ec2b309e3a447851b456ccaf8fb39f3661e7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/7123cf481e21b54eb6adc4cb0d8dc2876aeaee41 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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