{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2024-40999", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-07-12T12:17:45.608Z", "datePublished": "2024-07-12T12:37:40.507Z", "dateUpdated": "2026-08-05T11:34:31.394Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:34:31.394Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: ena: Add validation for completion descriptors consistency\n\nValidate that `first` flag is set only for the first\ndescriptor in multi-buffer packets.\nIn case of an invalid descriptor, a reset will occur.\nA new reset reason for RX data corruption has been added." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 9.8, "baseSeverity": "CRITICAL" }, "scenarios": [ { "lang": "en", "value": "AV:N - The vulnerable code is the NIC receive completion path (`ena_clean_rx_irq`/`ena_com_rx_pkt`), entered solely as a result of frames arriving from the network, and the multi-descriptor framing logic at fault is only exercised by large/scattered packets a remote peer generates at will. ENA is the standard NIC on internet-facing AWS EC2 instances, so the path is driven by remote, unauthenticated traffic.\nAC:L - No specific memory layout, victim state, or non-default configuration is required; the descriptor-framing path is exercised by ordinary multi-buffer RX traffic and the driver's cross-poll partial-packet state can be driven by sustained large-packet load. Per the rule to choose the higher severity when uncertain, the influenceable device-side framing condition is scored as Low rather than High.\nPR:N - Processing happens in NAPI/softirq context before any socket, filesystem, or authentication layer is reached, so no account or capability on the target is needed. A remote peer simply sends packets to the interface.\nUI:N - The RX completion path runs automatically whenever the interface is up and receiving traffic. No victim action of any kind is required.\nS:U - The mis-framed descriptors corrupt driver state and skb contents within the same kernel/host security authority. No VM, IOMMU, or sandbox boundary is crossed.\nC:H - Merged descriptor chains splice RX buffers belonging to unrelated packets into a single skb delivered to the network stack, and the accumulated `buf_offset`/`buf_len` can describe fragments extending past the real allocation, giving out-of-bounds reads. Stale page pointers reaching `skb_add_rx_frag()` constitute a use-after-free, which is scored High for confidentiality.\nI:H - The unguarded fragment loop can `page_ref_inc()` and `skb_add_rx_frag()` a stale or already-released page and DMA-unmap an already-unmapped buffer, producing double-free/UAF heap-corruption primitives; corrupted packet data is also injected into the stack. Memory corruption of this kind is exploitable for control-flow hijack and is scored High.\nA:H - A NULL `rx_info->page` reaching `page_ref_inc()`/`skb_add_rx_frag()` is an immediate kernel oops, and even the benign outcome is RX ring desync that stalls buffer replenishment and forces a full device reset, dropping network connectivity. Any kernel crash or hang is scored High." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/net/ethernet/amazon/ena/ena_eth_com.c", "drivers/net/ethernet/amazon/ena/ena_netdev.c", "drivers/net/ethernet/amazon/ena/ena_regs_defs.h" ], "versions": [ { "version": "1738cd3ed342294360d6a74d4e58800004bff854", "lessThan": "42146ee5286f16f1674a84f7c274dcca65c6ff2e", "status": "affected", "versionType": "git" }, { "version": "1738cd3ed342294360d6a74d4e58800004bff854", "lessThan": "b37b98a3a0c1198bafe8c2d9ce0bc845b4e7a9a7", "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/amazon/ena/ena_eth_com.c", "drivers/net/ethernet/amazon/ena/ena_netdev.c", "drivers/net/ethernet/amazon/ena/ena_regs_defs.h" ], "versions": [ { "version": "4.9", "status": "affected" }, { "version": "0", "lessThan": "4.9", "status": "unaffected", "versionType": "semver" }, { "version": "6.9.7", "lessThanOrEqual": "6.9.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.10", "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": "4.9", "versionEndExcluding": "6.9.7" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.9", "versionEndExcluding": "6.10" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/42146ee5286f16f1674a84f7c274dcca65c6ff2e" }, { "url": "https://git.kernel.org/stable/c/b37b98a3a0c1198bafe8c2d9ce0bc845b4e7a9a7" } ], "title": "net: ena: Add validation for completion descriptors consistency", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-02T04:39:56.158Z" }, "title": "CVE Program Container", "references": [ { "url": "https://git.kernel.org/stable/c/42146ee5286f16f1674a84f7c274dcca65c6ff2e", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/b37b98a3a0c1198bafe8c2d9ce0bc845b4e7a9a7", "tags": [ "x_transferred" ] } ] }, { "metrics": [ { "other": { "type": "ssvc", "content": { "id": "CVE-2024-40999", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "version": "2.0.3", "timestamp": "2024-09-10T17:01:22.448911Z" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-09-11T17:34:19.348Z" } } ] } }