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CVE-2026-64055

CRITICALCVSS 9.8/10EPSS 0.51%

Last modified

CVE-2026-64055 is a critical-severity vulnerability rated 9.8/10 on the CVSS scale. 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.. EPSS estimates a 0.51% chance of exploitation in the next 30 days.

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
9.8/10

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

EPSS Probability
0.51%

40.9th percentile

Probability of exploitation in the next 30 days. Learn more

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= 4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88, < df31e3b64455293df1ea89c7da7d5c9bfbcdd253; >= 4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88, < 7af1fabdee744b7995fe01b30b77dfc397657cb5; >= 4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88, < 75105fcf73f1ce7d9f769aaefec6e6d6645d5ac0; >= 4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88, < 78cf08b3be47c28f07008a76c932bad7cdffa9d8; >= 4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88, < 7123cf481e21b54eb6adc4cb0d8dc2876aeaee41; >= 4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88, < c373b34877afea61c89e0dd2e38948c624249b9b; >= 4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88, < 46806096f35b8d3dfa2f321ddd77f597edcdb85f; >= 4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88, < ebd8ec2b309e3a447851b456ccaf8fb39f3661e7
LinuxLinux4.16

References

Timeline

Published
Last Modified
Status
Awaiting Analysis

Frequently Asked Questions

What is CVE-2026-64055?
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.
How severe is CVE-2026-64055?
CVE-2026-64055 has a CVSS score of 9.8/10 (CRITICAL severity). The EPSS model estimates a 0.51% probability of exploitation in the next 30 days.
How do I fix CVE-2026-64055?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST