{"description":"Trending threats, MITRE ATT\u0026CK coverage, and detection metadata. Fed continuously.","feed_url":"https://feed.craftedsignal.io/products/ethtool/feed.json","home_page_url":"https://feed.craftedsignal.io/","items":[{"_cs_actors":[],"_cs_cpes":[],"_cs_cves":[{"id":"CVE-2026-63999"}],"_cs_exploited":false,"_cs_has_poc":false,"_cs_poc_references":[],"_cs_products":["ethtool"],"_cs_severities":["medium"],"_cs_tags":["linux","vulnerability","resource-leak"],"_cs_type":"advisory","_cs_vendors":["Linux"],"content_html":"\u003cp\u003eA vulnerability tracked as CVE-2026-63999 has been discovered in the \u003ccode\u003eethtool\u003c/code\u003e utility, a standard command-line program used by Linux administrators to query and control network driver and hardware settings. Specifically, this issue affects the Receive Side Scaling (RSS) functionality within \u003ccode\u003eethtool\u003c/code\u003e, which is a network driver technology that enables the efficient distribution of network receive processing across multiple CPU cores. The vulnerability occurs when the \u003ccode\u003eget_rxfh\u003c/code\u003e function, responsible for retrieving the RSS indirection table (indir_table) and hash key (hkey), fails. Under such failure conditions, the \u003ccode\u003eindir_table\u003c/code\u003e and \u003ccode\u003ehkey\u003c/code\u003e resources are not properly released, leading to a resource leak. While the provided information does not detail a specific exploitation vector, repeated triggering of this failure could deplete system resources, potentially resulting in system instability, performance degradation, or denial of service on affected Linux systems.\u003c/p\u003e\n\u003ch2 id=\"attack-chain\"\u003eAttack Chain\u003c/h2\u003e\n\u003cp\u003eThis brief describes a vulnerability and does not detail an observed attack chain.\u003c/p\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eSuccessful exploitation of CVE-2026-63999 could lead to system instability, degradation of network performance, or a denial of service condition due to resource exhaustion. As the \u003ccode\u003eindir_table\u003c/code\u003e and \u003ccode\u003ehkey\u003c/code\u003e resources are not properly freed upon \u003ccode\u003eget_rxfh\u003c/code\u003e failure, repeated triggers of this condition would consume increasing amounts of system memory or other critical resources. This could particularly affect systems relying heavily on \u003ccode\u003eethtool\u003c/code\u003e for network configuration or those where network driver issues frequently lead to \u003ccode\u003eget_rxfh\u003c/code\u003e failures. No specific victim counts or targeted sectors have been identified, as this is a technical vulnerability disclosure rather than an observed exploitation campaign.\u003c/p\u003e\n\u003ch2 id=\"recommendation\"\u003eRecommendation\u003c/h2\u003e\n\u003cul\u003e\n\u003cli\u003ePatch CVE-2026-63999 immediately by applying the latest security updates to the \u003ccode\u003eethtool\u003c/code\u003e utility on all affected Linux systems.\u003c/li\u003e\n\u003cli\u003eMonitor system resource utilization, especially memory and process counts, on Linux servers to detect potential symptoms of resource exhaustion that could arise from this vulnerability.\u003c/li\u003e\n\u003c/ul\u003e\n","date_modified":"2026-07-21T07:28:23Z","date_published":"2026-07-21T07:28:23Z","id":"https://feed.craftedsignal.io/briefs/2026-07-ethtool-rss-leak/","summary":"A vulnerability, CVE-2026-63999, has been identified in the `ethtool` utility on Linux systems, involving a resource leak of `indir_table` and `hkey` when the `get_rxfh` function related to Receive Side Scaling (RSS) functionality fails, which could lead to system instability or resource exhaustion.","title":"ethtool RSS Resource Leak on get_rxfh Failure","url":"https://feed.craftedsignal.io/briefs/2026-07-ethtool-rss-leak/"}],"language":"en","title":"CraftedSignal Threat Feed - Ethtool","version":"https://jsonfeed.org/version/1.1"}