9.8

CVE-2026-64055: linux

CVSS: 9.8v3.1CriticalAnalyzed
AliasesUBUNTU-CVE-2026-64055DEBIAN-CVE-2026-64055
Published 19-07-2026Last modified 05-08-2026
Open JSON

Vulnerability summary

CVE-2026-64055 is a critical (CVSS 9.8) vulnerability in linux. EPSS estimates a 0.51% chance of exploitation in the next 30 days, higher than 42.5% of scored vulnerabilities.

Overall risk
70/100
0100
High · default modelHow is this calculated?
CVSS score
9.8/10
010
Critical · v3.1 (CVE.org)
EPSS score
0.51%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 39 · Related 39
OPENSUSE-SU-2026:21910-1SUSE-SU-2026:23881-1SUSE-SU-2026:23887-1SUSE-SU-2026:23897-1SUSE-SU-2026:23902-1SUSE-SU-2026:4120-1

Timeline

  1. 19-07-2026
    PublishedVulnerability first disclosed.
  2. 05-08-2026
    Last modifiedVulnerability information updated.

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.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.51%

Chance of exploitation in the next 30 days

Percentile

43%

Versus all other CVEs

30-day change

0.00 pp

From 0.51% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.51%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Ubuntu163 products
  • linuxAll versions (No fix recorded) | < 5.15.0-186.196 | < 6.8.0-139.139 | < 7.0.0-28.28
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 5.15.0-1112.119 | < 6.8.0-1064.67 | < 7.0.0-1009.9
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ 4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88, < df31e3b64455293df1ea89c7da7d5c9bfbcdd253 | ≥ 4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88, < 7af1fabdee744b7995fe01b30b77dfc397657cb5 | ≥ 4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88, < 75105fcf73f1ce7d9f769aaefec6e6d6645d5ac0 | ≥ 4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88, < 78cf08b3be47c28f07008a76c932bad7cdffa9d8 | ≥ 4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88, < 7123cf481e21b54eb6adc4cb0d8dc2876aeaee41 | ≥ 4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88, < c373b34877afea61c89e0dd2e38948c624249b9b | ≥ 4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88, < 46806096f35b8d3dfa2f321ddd77f597edcdb85f | ≥ 4d5ae32f5e1e13f7f36d6439ec3257993b9f5b88, < ebd8ec2b309e3a447851b456ccaf8fb39f3661e7 | 4.16
  • linux_kernel≥ 4.16, < 5.10.258 | ≥ 5.11, < 5.15.209 | ≥ 5.16, < 6.1.175 | ≥ 6.2, < 6.6.142 | ≥ 6.7, < 6.12.92 | ≥ 6.13, < 6.18.34 | ≥ 6.19, < 7.0.11 | 7.1:rc1 | 7.1:rc2 | 7.1:rc3
Debian1 product
  • linux< 6.1.176-1 | < 6.12.94-1 | < 7.0.12-1

3 vendors · 166 products

References

44 links
Show all 44 references