What’s Vulnerable › Vulnerabilities

CVE-2026-63999: ethtool: rss: fix indir_table and hkey leak on get_rxfh failure

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-07-19 · updated 2026-10-21
• Weakness: CWE-401

Description

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.

Affected products

• Linux kernel: from 5.15.181 before 5.16; from 6.1.135 before 6.2; from 6.6.88 before 6.7; from 6.12.24 before 6.13; from 6.13.12 before 6.14; from 6.14.3 before 6.15 — fixed in 5.16, 6.13, 6.14, 6.15, 6.18.35, 6.2

How to fix

Upgrade to a fixed version: Linux kernel 5.16, 6.13, 6.14, 6.15. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/14dbf22c397b799b3a80f63fc90c2fc0585bbeb3
• https://git.kernel.org/stable/c/266297692f97008ca48bc311775c087c59bd7fe3
• https://git.kernel.org/stable/c/323faef6366349f57d4ad67d318a0c8906e360b3
• https://git.kernel.org/stable/c/33d05c22d6f227c5ae171c46df2f6f8bf48047ea
• https://git.kernel.org/stable/c/80d95d92f828cfcace955d673637d944178b435f

Get alerted when CVE-2026-63999 or the next vulnerability affects your stack