Vulnerability in Linux

CVE-2026-63999

In the Linux kernel, the following vulnerability has been resolved: ethtool: rss: fix indir_table and hkey leak on get_rxfh failure rss_prepare_get() allocates the indirection table and hash key buffer via rss_get_data_alloc(), then calls ops->get_rxfh() to populate them. If get_rxfh() fails, the function returns an error without freeing the allocation.

Published · last modified .

CVSS v3 metric

CVSS v3 base score 5.5 (Medium). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H.

EPSS exploit prediction

EPSS: 0.001 (1.8th percentile), scored .

Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 2nd percentile — 1.8% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS trend (30 days)EPSS over the last 30 days for CVE-2026-63999: held from 0.002 to 0.001.

EPSS over last 30 days · oldest: 0.002 · newest: 0.001 · change: -0.000

Affected products

  • Linux — versions 4f038a6a02d20859a3479293cbf172b0f14cbdd6, 81a5174e64ce4fb7b7a2f6499b835c904c9451ee, ec9faff49a4ea27731de39cb887b7e590e93157b
  • Linux Kernel — versions 6.15, 7.1

Weakness classification (CWE)

References

Frequently asked questions

What is CVE-2026-63999?
CVE-2026-63999 is a medium-severity vulnerability in Linux, classified under Missing Release of Memory after Effective Lifetime. CVSS score: 5.5/10. Published 2026-07-19.
How severe is CVE-2026-63999?
Medium severity. CVSS v3 base score is 5.5 out of 10.