SECUFOCUSNOW
Home›CVE index›CVE-2026-64055
Review reviewCritical

CVE-2026-64055

Linux

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...

CVSS
9.8
EPSS
-
- percentile
CISA KEV
Not listed
Published
2026.07.20
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability-
Technical severityCVSS 9.8

Vulnerability overview

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...

Affected product and versions

Product
Linux
Affected versions
>= 4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88 < df31e3b64455293df1ea89c7da7d5c9bfbcdd253, >= 4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88 < 7af1fabdee744b7995fe01b30b77dfc397657cb5, >= 4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88 < 75105fcf73f1ce7d9f769aaefec6e6d6645d5ac0, >= 4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88 < 78cf08b3be47c28f07008a76c932bad7cdffa9d8, >= 4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88 < 7123cf481e21b54eb6adc4cb0d8dc2876aeaee41, >= 4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88 < c373b34877afea61c89e0dd2e38948c624249b9b, >= 4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88 < 46806096f35b8d3dfa2f321ddd77f597edcdb85f, >= 4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88 < ebd8ec2b309e3a447851b456ccaf8fb39f3661e7, >= 4.16
Fixed versions
No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
CWE
Not available