{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2021-46948", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-02-25T13:45:52.722Z", "datePublished": "2024-02-27T18:40:32.895Z", "dateUpdated": "2026-08-05T08:45:11.702Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T08:45:11.702Z" }, "descriptions": [ { "lang": "en", "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)." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "baseScore": 7.5, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "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." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/net/ethernet/sfc/farch.c" ], "versions": [ { "version": "12804793b17c0e19115a90d98f2f3df0cb79e233", "lessThan": "bf2b941d0a6f2d3b9f5fa3c4c21bdd54f71ce253", "status": "affected", "versionType": "git" }, { "version": "12804793b17c0e19115a90d98f2f3df0cb79e233", "lessThan": "35c7a83ad1bb1d48ae249346e61b1132bcbf9052", "status": "affected", "versionType": "git" }, { "version": "12804793b17c0e19115a90d98f2f3df0cb79e233", "lessThan": "e531db1ea6f98c9612cb2de093a107c7eadfb96c", "status": "affected", "versionType": "git" }, { "version": "12804793b17c0e19115a90d98f2f3df0cb79e233", "lessThan": "83b09a1807415608b387c7bc748d329fefc5617e", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/net/ethernet/sfc/farch.c" ], "versions": [ { "version": "5.10", "status": "affected" }, { "version": "0", "lessThan": "5.10", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.36", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.11.20", "lessThanOrEqual": "5.11.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.12.3", "lessThanOrEqual": "5.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.13", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10", "versionEndExcluding": "5.10.36" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10", "versionEndExcluding": "5.11.20" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10", "versionEndExcluding": "5.12.3" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.10", "versionEndExcluding": "5.13" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/bf2b941d0a6f2d3b9f5fa3c4c21bdd54f71ce253" }, { "url": "https://git.kernel.org/stable/c/35c7a83ad1bb1d48ae249346e61b1132bcbf9052" }, { "url": "https://git.kernel.org/stable/c/e531db1ea6f98c9612cb2de093a107c7eadfb96c" }, { "url": "https://git.kernel.org/stable/c/83b09a1807415608b387c7bc748d329fefc5617e" } ], "title": "sfc: farch: fix TX queue lookup in TX event handling", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "other": { "type": "ssvc", "content": { "id": "CVE-2021-46948", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "version": "2.0.3", "timestamp": "2024-03-11T16:39:46.469007Z" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-07-05T17:22:13.138Z" } }, { "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-04T05:17:43.029Z" }, "title": "CVE Program Container", "references": [ { "url": "https://git.kernel.org/stable/c/bf2b941d0a6f2d3b9f5fa3c4c21bdd54f71ce253", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/35c7a83ad1bb1d48ae249346e61b1132bcbf9052", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/e531db1ea6f98c9612cb2de093a107c7eadfb96c", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/83b09a1807415608b387c7bc748d329fefc5617e", "tags": [ "x_transferred" ] } ] } ] } }