{"description":"Trending threats, MITRE ATT\u0026CK coverage, and detection metadata — refreshed continuously.","feed_url":"https://feed.craftedsignal.io/tags/cve-2026-31507/","home_page_url":"https://feed.craftedsignal.io/","items":[{"_cs_actors":[],"_cs_cves":[{"id":"CVE-2026-31507"}],"_cs_exploited":false,"_cs_products":[],"_cs_severities":["high"],"_cs_tags":["cve-2026-31507","double-free","memory corruption","denial of service"],"_cs_type":"advisory","_cs_vendors":["Microsoft"],"content_html":"\u003cp\u003eOn April 23, 2026, Microsoft published a security update guide addressing CVE-2026-31507, a double-free vulnerability residing in the net/smc (Sockets Multiplexing Controller) module of the Linux kernel. The vulnerability stems from a flaw in how the \u003ccode\u003etee()\u003c/code\u003e function handles the duplication of splice pipe buffers. Specifically, when \u003ccode\u003etee()\u003c/code\u003e duplicates a splice pipe buffer associated with the \u003ccode\u003esmc_spd_priv\u003c/code\u003e structure, it can lead to a double-free condition. This flaw could allow a local attacker to trigger memory corruption or a denial-of-service condition. While specific exploitation details are currently lacking, the nature of double-free vulnerabilities makes them a critical concern for system stability and security.\u003c/p\u003e\n\u003ch2 id=\"attack-chain\"\u003eAttack Chain\u003c/h2\u003e\n\u003col\u003e\n\u003cli\u003eA local attacker gains access to the system.\u003c/li\u003e\n\u003cli\u003eThe attacker crafts a malicious program that interacts with the net/smc module.\u003c/li\u003e\n\u003cli\u003eThe program triggers the \u003ccode\u003etee()\u003c/code\u003e function to duplicate a splice pipe buffer related to \u003ccode\u003esmc_spd_priv\u003c/code\u003e.\u003c/li\u003e\n\u003cli\u003eDue to the vulnerability, the same memory region associated with \u003ccode\u003esmc_spd_priv\u003c/code\u003e is freed twice.\u003c/li\u003e\n\u003cli\u003eThe double-free corrupts the heap metadata.\u003c/li\u003e\n\u003cli\u003eSubsequent memory allocations may lead to arbitrary code execution or denial-of-service.\u003c/li\u003e\n\u003cli\u003eThe attacker could leverage the memory corruption to escalate privileges.\u003c/li\u003e\n\u003cli\u003eSuccessful exploitation results in system compromise.\u003c/li\u003e\n\u003c/ol\u003e\n\u003ch2 id=\"impact\"\u003eImpact\u003c/h2\u003e\n\u003cp\u003eSuccessful exploitation of CVE-2026-31507 can lead to memory corruption, potentially enabling arbitrary code execution and privilege escalation. A more likely outcome is a denial-of-service condition, where the system becomes unstable or crashes due to heap corruption. The vulnerability affects systems utilizing the affected net/smc module. While the number of potential victims is unknown, the wide deployment of the Linux kernel makes this a significant concern.\u003c/p\u003e\n\u003ch2 id=\"recommendation\"\u003eRecommendation\u003c/h2\u003e\n\u003cul\u003e\n\u003cli\u003eApply the security patch provided by Microsoft that addresses CVE-2026-31507 to mitigate the double-free vulnerability.\u003c/li\u003e\n\u003cli\u003eMonitor systems for unusual \u003ccode\u003etee()\u003c/code\u003e function calls within the \u003ccode\u003enet/smc\u003c/code\u003e module using a process creation rule with relevant command-line arguments and process ancestry.\u003c/li\u003e\n\u003c/ul\u003e\n","date_modified":"2026-04-23T07:27:47Z","date_published":"2026-04-23T07:27:47Z","id":"/briefs/2024-05-cve-2026-31507/","summary":"CVE-2026-31507 is a double-free vulnerability in the net/smc module that occurs when the tee() function duplicates a splice pipe buffer, potentially leading to memory corruption and denial of service.","title":"CVE-2026-31507 Double-Free Vulnerability in net/smc","url":"https://feed.craftedsignal.io/briefs/2024-05-cve-2026-31507/"}],"language":"en","title":"CraftedSignal Threat Feed — Cve-2026-31507","version":"https://jsonfeed.org/version/1.1"}