{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-23414", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-01-13T15:37:46.014Z", "datePublished": "2026-04-02T11:40:55.746Z", "dateUpdated": "2026-08-05T12:21:34.632Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T12:21:34.632Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntls: Purge async_hold in tls_decrypt_async_wait()\n\nThe async_hold queue pins encrypted input skbs while\nthe AEAD engine references their scatterlist data. Once\ntls_decrypt_async_wait() returns, every AEAD operation\nhas completed and the engine no longer references those\nskbs, so they can be freed unconditionally.\n\nA subsequent patch adds batch async decryption to\ntls_sw_read_sock(), introducing a new call site that\nmust drain pending AEAD operations and release held\nskbs. Move __skb_queue_purge(&ctx->async_hold) into\ntls_decrypt_async_wait() so the purge is centralized\nand every caller -- recvmsg's drain path, the -EBUSY\nfallback in tls_do_decryption(), and the new read_sock\nbatch path -- releases held skbs on synchronization\nwithout each site managing the purge independently.\n\nThis fixes a leak when tls_strp_msg_hold() fails part-way through,\nafter having added some cloned skbs to the async_hold\nqueue. tls_decrypt_sg() will then call tls_decrypt_async_wait() to\nprocess all pending decrypts, and drop back to synchronous mode, but\ntls_sw_recvmsg() only flushes the async_hold queue when one record has\nbeen processed in \"fully-async\" mode, which may not be the case here.\n\n[pabeni@redhat.com: added leak comment]" } ], "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 vulnerable receive-side kTLS path processes TLS records delivered over an established TCP connection, and a remote TLS peer can supply the encrypted records that drive `tls_sw_recvmsg()` into async decryption.\nAC:L - A reasonable deployment with software kTLS RX, TLS 1.2, and an async AEAD provider lets the attacker repeatedly send records that force the async hold path; allocation failure/memory pressure can be induced by sustained remote traffic, so no uncontrollable race is required.\nPR:N - The remote peer does not need local credentials or kernel privileges to send TLS application data to a service using kTLS RX, and no in-kernel authentication gate exists on the receive/decrypt path.\nUI:N - Exploitation only requires the victim service/socket to receive data in its normal operation; no separate user action is needed.\nS:U - The leak affects kernel networking memory and system availability within the same kernel security authority, without crossing a VM, sandbox, or hardware isolation boundary.\nC:N - The bug leaks skb references in `async_hold` after a partial `tls_strp_msg_hold()` failure, but it does not expose kernel memory or create an attacker-readable disclosure primitive.\nI:N - The fixed bug is a cleanup omission causing leaked held skbs, not an out-of-bounds write, UAF, or data/control-flow corruption primitive.\nA:H - The leaked skb clones and pinned receive buffers can accumulate across repeated remote-triggered failures and exhaust kernel memory, producing a denial of service." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/tls/tls_sw.c" ], "versions": [ { "version": "9f83fd0c179e0f458e824e417f9d5ad53443f685", "lessThan": "ac435be7c7613eb13a5a8ceb5182e10b50c9ce87", "status": "affected", "versionType": "git" }, { "version": "c61d4368197d65c4809d9271f3b85325a600586a", "lessThan": "2dcf324855c34e7f934ce978aa19b645a8f3ee71", "status": "affected", "versionType": "git" }, { "version": "39dec4ea3daf77f684308576baf483b55ca7f160", "lessThan": "6dc11e0bd0a5466bcc76d275c09e5537bd0597dd", "status": "affected", "versionType": "git" }, { "version": "b8a6ff84abbcbbc445463de58704686011edc8e1", "lessThan": "9f557c7eae127b44d2e863917dc986a4b6cb1269", "status": "affected", "versionType": "git" }, { "version": "b8a6ff84abbcbbc445463de58704686011edc8e1", "lessThan": "fd8037e1f18ca5336934d0e0e7e1a4fe097e749d", "status": "affected", "versionType": "git" }, { "version": "b8a6ff84abbcbbc445463de58704686011edc8e1", "lessThan": "84a8335d8300576f1b377ae24abca1d9f197807f", "status": "affected", "versionType": "git" }, { "version": "4fc109d0ab196bd943b7451276690fb6bb48c2e0", "status": "affected", "versionType": "git" }, { "version": "6.1.158", "lessThan": "6.1.168", "status": "affected", "versionType": "semver" }, { "version": "6.6.114", "lessThan": "6.6.131", "status": "affected", "versionType": "semver" }, { "version": "6.12.55", "lessThan": "6.12.80", "status": "affected", "versionType": "semver" }, { "version": "6.17.5", "lessThan": "6.18", "status": "affected", "versionType": "semver" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/tls/tls_sw.c" ], "versions": [ { "version": "6.18", "status": "affected" }, { "version": "0", "lessThan": "6.18", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.168", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.131", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.80", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.21", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.19.11", "lessThanOrEqual": "6.19.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.0", "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": "6.1.158", "versionEndExcluding": "6.1.168" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6.114", "versionEndExcluding": "6.6.131" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.12.55", "versionEndExcluding": "6.12.80" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.18", "versionEndExcluding": "6.18.21" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.18", "versionEndExcluding": "6.19.11" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.18", "versionEndExcluding": "7.0" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.17.5" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/ac435be7c7613eb13a5a8ceb5182e10b50c9ce87" }, { "url": "https://git.kernel.org/stable/c/2dcf324855c34e7f934ce978aa19b645a8f3ee71" }, { "url": "https://git.kernel.org/stable/c/6dc11e0bd0a5466bcc76d275c09e5537bd0597dd" }, { "url": "https://git.kernel.org/stable/c/9f557c7eae127b44d2e863917dc986a4b6cb1269" }, { "url": "https://git.kernel.org/stable/c/fd8037e1f18ca5336934d0e0e7e1a4fe097e749d" }, { "url": "https://git.kernel.org/stable/c/84a8335d8300576f1b377ae24abca1d9f197807f" } ], "title": "tls: Purge async_hold in tls_decrypt_async_wait()", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": 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