{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2021-47215", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-04-10T18:59:19.528Z", "datePublished": "2024-04-10T19:01:55.157Z", "dateUpdated": "2026-08-05T08:46:45.596Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T08:46:45.596Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/mlx5e: kTLS, Fix crash in RX resync flow\n\nFor the TLS RX resync flow, we maintain a list of TLS contexts\nthat require some attention, to communicate their resync information\nto the HW.\nHere we fix list corruptions, by protecting the entries against\nmovements coming from resync_handle_seq_match(), until their resync\nhandling in napi is fully completed." } ], "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 buggy path is mlx5e kTLS RX resync (mlx5e_ktls_rx_resync → resync_handle_seq_match), invoked from the TLS stack when processing records from a remote peer after the NIC signals CQE_TLS_OFFLOAD_RESYNC; kTLS bugs driven by remote peer data are Network per guidance.\nAC:L - A remote peer can induce HW stream desync (reorder/loss/stream-scan) and then flood TLS records so multiple seq-match callbacks re-add the same priv_rx while it remains on the resync or NAPI local list; the attacker drives both the match callbacks and the RX/NAPI activity that opens the window.\nPR:N - Triggering requires only connecting as a TLS client to a service that has installed kTLS RX hardware offload on an mlx5 NIC; no local OS privileges or authenticated kernel credentials are needed.\nUI:N - The victim need only already be serving TLS with mlx5 kTLS RX offload; the attacker alone completes the handshake and drives the resync/race traffic with no further user action.\nS:U - List corruption stays within host kernel heap/list state for the mlx5e/TLS offload contexts and does not cross a VM, IOMMU, or other separate security authority.\nC:H - Double list_add of an in-list node corrupts neighboring list pointers and yields classic heap UAF when those links are later walked, which can be groomed for arbitrary kernel memory disclosure.\nI:H - Subsequent list_del/list_move/splice through the corrupted pointers write into attacker-influenced addresses, providing a heap corruption and control-flow hijack primitive beyond a mere crash.\nA:H - The fix explicitly addresses a crash from list corruption in the RX resync flow; corrupted list walks produce kernel oops/BUG (list_debug) that fully disrupt host 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/mellanox/mlx5/core/en_accel/ktls_rx.c" ], "versions": [ { "version": "e9ce991bce5bacf71641bd0f72f4b7c589529f40", "lessThan": "ebeda7a9528ae690e6bf12791a868f0cca8391f2", "status": "affected", "versionType": "git" }, { "version": "e9ce991bce5bacf71641bd0f72f4b7c589529f40", "lessThan": "cc4a9cc03faa6d8db1a6954bb536f2c1e63bdff6", "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/mellanox/mlx5/core/en_accel/ktls_rx.c" ], "versions": [ { "version": "5.13", "status": "affected" }, { "version": "0", "lessThan": "5.13", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.5", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.16", "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": "5.13", "versionEndExcluding": "5.15.5" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.13", "versionEndExcluding": "5.16" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/ebeda7a9528ae690e6bf12791a868f0cca8391f2" }, { "url": "https://git.kernel.org/stable/c/cc4a9cc03faa6d8db1a6954bb536f2c1e63bdff6" } ], "title": "net/mlx5e: kTLS, Fix crash in RX resync flow", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-04T05:32:07.443Z" }, "title": "CVE Program Container", "references": [ { "url": "https://git.kernel.org/stable/c/ebeda7a9528ae690e6bf12791a868f0cca8391f2", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/cc4a9cc03faa6d8db1a6954bb536f2c1e63bdff6", "tags": [ "x_transferred" ] } ] }, { "metrics": [ { "other": { "type": "ssvc", "content": { "id": "CVE-2021-47215", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "version": "2.0.3", "timestamp": "2024-09-10T15:49:52.131087Z" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-09-11T17:32:56.486Z" } } ] } }