248 lines
12 KiB
JSON
248 lines
12 KiB
JSON
{
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"cveId": "CVE-2021-46948",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2024-02-25T13:45:52.722Z",
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"datePublished": "2024-02-27T18:40:32.895Z",
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"dateUpdated": "2026-08-05T08:45:11.702Z"
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsfc: farch: fix TX queue lookup in TX event handling\n\nWe're starting from a TXQ label, not a TXQ type, so\n efx_channel_get_tx_queue() is inappropriate (and could return NULL,\n leading to panics)."
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"value": "AV:N - On Siena/farch, TX completions for queue labels 2–3 (HIGHPRI TC or XDP_TX/REDIRECT queues) hit the buggy lookup. A remote peer can drive that path by sending traffic that is XDP-redirected/TX’d or QoS-classified onto HIGHPRI TX queues on a host using this NIC.\nAC:L - The attacker only needs to generate traffic that completes on those TX queues; RSS/XDP CPU mapping makes hitting labels 2–3 reliable under load, with no race or unpredictable hardware state required.\nPR:N - In the highest-impact deployments (XDP_TX/REDIRECT or TC/mqprio HIGHPRI already configured on the Solarflare interface), an unauthenticated network peer can trigger the panic without any local account or capabilities.\nUI:N - Exploitation requires no victim user action beyond the host already running the affected driver configuration; packet delivery alone drives the TX completion path.\nS:U - Impact is a kernel oops/panic in the host OS networking authority; it does not cross into a different security domain such as a guest-to-host or IOMMU boundary.\nC:N - The failure is a NULL pointer dereference in efx_xmit_done with no out-of-bounds read or UAF, so it does not disclose memory contents.\nI:N - tx_queue_by_type[2/3] is NULL, so the crash is a pure NULL deref with no attacker-controlled write or corruptible object to hijack control flow.\nA:H - Dereferencing the NULL tx_queue in efx_xmit_done causes a kernel oops/panic, fully disrupting system availability."
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