{"apiVersion":"1.0","identifier":"CVE-2026-99079","description":"In the Linux kernel, the following vulnerability has been resolved: net/mlx5e: Prevent stale XSK buffer release on refill retry When an XDP redirect to an AF_XDP socket fails because its RX ring is full, the XSK core frees the buffer. During the subsequent batched refill of a legacy cyclic RQ, mlx5e also releases the WQE-s XSK buffer before allocating a replacement. If that refill succeeds only partially, a WQE left without a replacement retains its old buffer pointer. The buffer can meanwhile be allocated to another WQE. A later refill retry can then free the live buffer through the stale pointer and publish the same UMEM frame twice. Mark the WQE as released immediately after the driver-side free. The flag is already cleared when a replacement buffer is assigned, so refill retries no longer release stale pointers. The failure is silent and produces no kernel warning or splat. A standalone legacy cyclic-RQ zero-copy libxsk reproducer, using 64-byte UDP traffic offered at 12 Mpps, detected it: stock stopped after 2,854,914 packets in 4.094 seconds, with 4,542 xdp_rx_ring_full events and 64 ownership/double-publication errors. With this change it processed 356,904,225 packets in 30 seconds despite 571,405 xdp_rx_ring_full events, with no ownership or data errors.","publishedAt":"2026-10-23T13:17:32","lastModifiedAt":"2026-10-24T14:16:54","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-99079","cvssScore":9.8,"cvssVector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","epssProbability":0.00455,"riskScore":1.02,"affectedProduct":"Linux kernel","affectedVersions":"unknown","vulnerabilityType":"Kernel","operatingSystems":[],"links":{"self":"https://www.redsauce.net/api/cves/CVE-2026-99079","webPages":{"es":"https://www.redsauce.net/es/cves/CVE-2026-99079","en":"https://www.redsauce.net/en/cves/CVE-2026-99079","fr":"https://www.redsauce.net/fr/cves/CVE-2026-99079","pt":"https://www.redsauce.net/pt/cves/CVE-2026-99079","de":"https://www.redsauce.net/de/cves/CVE-2026-99079","sk":"https://www.redsauce.net/sk/cves/CVE-2026-99079","el":"https://www.redsauce.net/el/cves/CVE-2026-99079"},"source":"https://nvd.nist.gov/vuln/detail/CVE-2026-99079"}}