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CVE-2026-64055— net: ethernet: cortina: Carry over frag counter

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会开源的一款操作系统内核。 Linux kernel 4.16版本存在安全漏洞，该漏洞源于ring buffer中gmac_rx() NAPI轮询函数组装数据包时，在轮询周期中完全清空ring buffer后退出，导致尚未完全组装的数据包分片计数器frag_nr在下次调用时被重置为零，可能造成数据包组装错误。

CVSS 9.8 · Critical EPSS 0.51% · P43

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88< df31e3b64455293df1ea89c7da7d5c9bfbcdd253 affected
4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88< 7af1fabdee744b7995fe01b30b77dfc397657cb5 affected
4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88< 75105fcf73f1ce7d9f769aaefec6e6d6645d5ac0 affected
4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88< 78cf08b3be47c28f07008a76c932bad7cdffa9d8 affected
4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88< 7123cf481e21b54eb6adc4cb0d8dc2876aeaee41 affected
4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88< c373b34877afea61c89e0dd2e38948c624249b9b affected
4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88< 46806096f35b8d3dfa2f321ddd77f597edcdb85f affected
4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88< ebd8ec2b309e3a447851b456ccaf8fb39f3661e7 affected
… +10 more rows
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I. Basic Information for CVE-2026-64055

Vulnerability Information
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Vulnerability Title
net: ethernet: cortina: Carry over frag counter
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会开源的一款操作系统内核。 Linux kernel 4.16版本存在安全漏洞，该漏洞源于ring buffer中gmac_rx() NAPI轮询函数组装数据包时，在轮询周期中完全清空ring buffer后退出，导致尚未完全组装的数据包分片计数器frag_nr在下次调用时被重置为零，可能造成数据包组装错误。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88 ~ df31e3b64455293df1ea89c7da7d5c9bfbcdd253 -
Linux Linux 4.16 -

II. Public POCs for CVE-2026-64055

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III. Intelligence Information for CVE-2026-64055

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Patches & Fixes for CVE-2026-64055 (8)

Same Patch Batch · Linux · 2026-07-19 · 429 CVEs total

CVE-2026-63795 10.0 CRITICAL 9p: avoid putting oldfid in p9_client_walk() error path
CVE-2026-63979 9.8 CRITICAL net/handshake: hand off the pinned file reference to accept_doit
CVE-2026-53399 9.8 CRITICAL nfsd: release layout stid on setlease failure
CVE-2026-53398 9.8 CRITICAL NFSD: Fix SECINFO_NO_NAME decode error cleanup
CVE-2026-64089 9.8 CRITICAL batman-adv: tt: fix negative last_changeset_len
CVE-2026-64091 9.8 CRITICAL batman-adv: tt: fix TOCTOU race for reported vlans
CVE-2026-64025 9.8 CRITICAL bpf, skmsg: fix verdict sk_data_ready racing with ktls rx
CVE-2026-64113 9.8 CRITICAL ixgbevf: fix use-after-free in VEPA multicast source pruning
CVE-2026-63924 9.8 CRITICAL ipv6: exthdrs: refresh nh pointer after ipv6_hop_jumbo()
CVE-2026-64037 9.8 CRITICAL wifi: iwlwifi: mld: fix TSO segmentation explosion when AMSDU is disabled
CVE-2026-63984 9.8 CRITICAL ipv6: rpl: fix hdrlen overflow in ipv6_rpl_srh_decompress()
CVE-2026-63800 9.8 CRITICAL pNFS: Fix use-after-free in pnfs_update_layout()
CVE-2026-63888 9.8 CRITICAL scsi: target: iscsi: Fix CRC overread and double-free in iscsit_handle_text_cmd()
CVE-2026-63887 9.8 CRITICAL scsi: target: iscsi: Bound iscsi_encode_text_output() appends to rsp_buf
CVE-2026-64136 9.8 CRITICAL smb: client: protect tc_count increment in smb2_find_smb_sess_tcon_unlocked()
CVE-2026-64035 9.8 CRITICAL igc: set tx buffer type for SMD frames
CVE-2026-64066 9.8 CRITICAL netfs: Fix netfs_read_to_pagecache() to pause on subreq failure
CVE-2026-64125 9.8 CRITICAL net: bcmgenet: keep RBUF EEE/PM disabled
CVE-2026-64061 9.8 CRITICAL netfs: Fix early put of sink folio in netfs_read_gaps()
CVE-2026-64033 9.8 CRITICAL RDMA/rtrs: Fix use-after-free in path file creation cleanup

Showing top 20 of 429 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-64055

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