{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2021-46911", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-02-25T13:45:52.718Z", "datePublished": "2024-02-27T06:53:51.486Z", "dateUpdated": "2026-08-05T08:45:02.058Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T08:45:02.058Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nch_ktls: Fix kernel panic\n\nTaking page refcount is not ideal and causes kernel panic\nsometimes. It's better to take tx_ctx lock for the complete\nskb transmit, to avoid page cleanup if ACK received in middle." } ], "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 free side of the race is driven by TCP ACK processing (tls_icsk_clean_acked) on packets from a remote peer of a Chelsio kTLS-offloaded TLS service, matching network-reachable kTLS/peer-triggered bugs.\nAC:L - A remote peer can induce TX (e.g., request a large response) and control ACK timing, so the attacker influences both sides of the unlocked record-use vs. destroy_record race.\nPR:N - Any unauthenticated network client that can complete a TCP connection to a service using Chelsio HW kTLS TX can send the ACKs that free records; no local privileges are required.\nUI:N - Exploitation requires only the attacker’s own connection and carefully timed ACKs; no separate victim user action is needed.\nS:U - Impact is confined to the host kernel authority (panic or privilege escalation on the same system); there is no VM/IOMMU/sandbox boundary crossing.\nC:H - After destroy_record kfree’s the tls_record_info, TX still reads record metadata and frags (including kmap/memcpy of page contents), so the UAF can yield arbitrary kernel read primitives.\nI:H - UAF of the record while chcr_ktls_copy_record_in_skb and related TX handlers consume frags enables heap reuse and control-flow/data corruption primitives toward code execution.\nA:H - The fix explicitly addresses a kernel panic from racing ACK-driven page/record cleanup during TX, so availability impact is a full kernel crash." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/net/ethernet/chelsio/inline_crypto/ch_ktls/chcr_ktls.c" ], "versions": [ { "version": "5a4b9fe7fece62ecab6fb28fe92362f83b41c33e", "lessThan": "8d5a9dbd2116a852f8f0f91f6fbc42a0afe1091f", "status": "affected", "versionType": "git" }, { "version": "5a4b9fe7fece62ecab6fb28fe92362f83b41c33e", "lessThan": "8348665d4181c68b0ca1205b48e1753d78bc810f", "status": "affected", "versionType": "git" }, { "version": "5a4b9fe7fece62ecab6fb28fe92362f83b41c33e", "lessThan": "1a73e427b824133940c2dd95ebe26b6dce1cbf10", "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/chelsio/inline_crypto/ch_ktls/chcr_ktls.c" ], "versions": [ { "version": "5.7", "status": "affected" }, { "version": "0", "lessThan": "5.7", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.32", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.11.16", "lessThanOrEqual": "5.11.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.12", "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": "5.7", "versionEndExcluding": "5.10.32" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.7", "versionEndExcluding": "5.11.16" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.7", "versionEndExcluding": "5.12" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/8d5a9dbd2116a852f8f0f91f6fbc42a0afe1091f" }, { "url": "https://git.kernel.org/stable/c/8348665d4181c68b0ca1205b48e1753d78bc810f" }, { "url": "https://git.kernel.org/stable/c/1a73e427b824133940c2dd95ebe26b6dce1cbf10" } ], "title": "ch_ktls: Fix kernel panic", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "other": { "type": "ssvc", "content": { "timestamp": "2024-06-26T20:42:53.147754Z", "id": "CVE-2021-46911", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "partial" } ], "role": "CISA Coordinator", "version": "2.0.3" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2024-06-26T20:43:04.324Z" } }, { "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-04T05:17:42.973Z" }, "title": "CVE Program Container", "references": [ { "url": "https://git.kernel.org/stable/c/8d5a9dbd2116a852f8f0f91f6fbc42a0afe1091f", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/8348665d4181c68b0ca1205b48e1753d78bc810f", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/1a73e427b824133940c2dd95ebe26b6dce1cbf10", "tags": [ "x_transferred" ] } ] } ] } }