{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2024-50094", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-10-21T19:36:19.943Z", "datePublished": "2024-11-05T17:04:57.299Z", "dateUpdated": "2026-08-05T11:41:37.056Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:41:37.056Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsfc: Don't invoke xdp_do_flush() from netpoll.\n\nYury reported a crash in the sfc driver originated from\nnetpoll_send_udp(). The netconsole sends a message and then netpoll\ninvokes the driver's NAPI function with a budget of zero. It is\ndedicated to allow driver to free TX resources, that it may have used\nwhile sending the packet.\n\nIn the netpoll case the driver invokes xdp_do_flush() unconditionally,\nleading to crash because bpf_net_context was never assigned.\n\nInvoke xdp_do_flush() only if budget is not zero." } ], "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 - The crash is reached through the netpoll/netconsole transmit path on the sfc NIC, and an unauthenticated remote attacker can drive both required conditions with packets alone — flood-induced rate-limited kernel log lines (SYN-flood/martian-source/conntrack-full messages) supply the printk, and the same flood supplies the TX-queue contention that forces `__netpoll_send_skb()` into the `netpoll_poll_dev()` retry loop.\nAC:L - Once netconsole is active on an sfc interface, every entry into `netpoll_poll_dev()` crashes deterministically — there is no race, no memory-layout dependency, and no timing window, and the attacker creates the TX contention that forces that entry by sustaining traffic.\nPR:N - No authentication or credential of any kind is checked along the path; the trigger is an ordinary kernel log message being shipped by netconsole, and the remote packets that induce those messages are processed pre-authentication by the TCP/IP stack.\nUI:N - No victim action is needed — netconsole emits on every printk automatically, so the attacker's own traffic completes the trigger without any local user or administrator doing anything.\nS:U - The faulting read and its consequences are confined to the kernel of the affected host; no VM, IOMMU, or sandbox boundary is crossed.\nC:N - The defect is a read of a NULL pointer at a fixed small offset whose result is never returned to or observable by the attacker; nothing is disclosed.\nI:N - No write occurs and no attacker-controlled data is stored — the faulting access is a load, so no kernel state is modified.\nA:H - The NULL dereference occurs in netpoll/console context with interrupts disabled, producing a kernel oops that is generally fatal, and it re-fires on every subsequent log message, so the host is reliably taken down." } ] } ], "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/efx_channels.c", "drivers/net/ethernet/sfc/siena/efx_channels.c" ], "versions": [ { "version": "401cb7dae8130fd34eb84648e02ab4c506df7d5e", "lessThan": "65d4fc76d75c136744e67754d20feda609e7b793", "status": "affected", "versionType": "git" }, { "version": "401cb7dae8130fd34eb84648e02ab4c506df7d5e", "lessThan": "55e802468e1d38dec8e25a2fdb6078d45b647e8c", "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/efx_channels.c", "drivers/net/ethernet/sfc/siena/efx_channels.c" ], "versions": [ { "version": "6.11", "status": "affected" }, { "version": "0", "lessThan": "6.11", "status": "unaffected", "versionType": "semver" }, { "version": "6.11.4", "lessThanOrEqual": "6.11.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12", "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": "6.11", "versionEndExcluding": "6.11.4" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.11", "versionEndExcluding": "6.12" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/65d4fc76d75c136744e67754d20feda609e7b793" }, { "url": "https://git.kernel.org/stable/c/55e802468e1d38dec8e25a2fdb6078d45b647e8c" } ], "title": "sfc: Don't invoke xdp_do_flush() from netpoll.", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "cvssV3_1": { "scope": "UNCHANGED", "version": "3.1", "baseScore": 5.5, "attackVector": "LOCAL", "baseSeverity": "MEDIUM", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "integrityImpact": "NONE", "userInteraction": "NONE", "attackComplexity": "LOW", "availabilityImpact": "HIGH", "privilegesRequired": "LOW", "confidentialityImpact": "NONE" } }, { "other": { "type": "ssvc", "content": { "id": "CVE-2024-50094", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "version": "2.0.3", "timestamp": "2025-10-01T20:22:55.627667Z" } } } ], "problemTypes": [ { "descriptions": [ { "lang": "en", "type": "CWE", "description": "CWE-noinfo Not enough information" } ] } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2025-10-01T20:27:19.526Z" } } ] } }