{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2024-26800", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2024-02-19T14:20:24.179Z", "datePublished": "2024-04-04T08:20:28.554Z", "dateUpdated": "2026-08-05T11:27:21.641Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T11:27:21.641Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntls: fix use-after-free on failed backlog decryption\n\nWhen the decrypt request goes to the backlog and crypto_aead_decrypt\nreturns -EBUSY, tls_do_decryption will wait until all async\ndecryptions have completed. If one of them fails, tls_do_decryption\nwill return -EBADMSG and tls_decrypt_sg jumps to the error path,\nreleasing all the pages. But the pages have been passed to the async\ncallback, and have already been released by tls_decrypt_done.\n\nThe only true async case is when crypto_aead_decrypt returns\n -EINPROGRESS. With -EBUSY, we already waited so we can tell\ntls_sw_recvmsg that the data is available for immediate copy, but we\nneed to notify tls_decrypt_sg (via the new ->async_done flag) that the\nmemory has already been released." } ], "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 bug is triggered entirely by TLS records arriving from the remote peer on a kTLS (net/tls TLS_SW) socket — a corrupted AEAD tag produces the -EBADMSG that drives the double-free path, and record volume drives the crypto backlog. No local access is needed.\nAC:L - The attacker controls both required conditions: flooding TLS records across connections saturates the crypto backlog to force -EBUSY, and a single record with a bad GCM tag deterministically forces -EBADMSG, after which the error path unconditionally re-frees memory the completion callback already released.\nPR:N - kTLS is armed after a userspace TLS handshake, and typical kTLS servers (nginx/OpenSSL TLS termination) accept unauthenticated clients with no client certificate, so any anonymous remote peer can drive the vulnerable receive path.\nUI:N - The victim socket is processed by the server's normal recvmsg loop; no action by a local user or administrator is required.\nS:U - The double-free and page refcount underflow corrupt kernel heap and page state within the same kernel security authority; no hypervisor, IOMMU, or sandbox boundary is crossed.\nC:H - The duplicated put_page() underflows the refcount of pages pinned from the user's recvmsg buffer, so a page still mapped into the process can be reallocated to the kernel and read directly; the slab double-free of the aead_req/dctx block additionally enables freelist-based disclosure.\nI:H - A double-free of an attacker-size-influenced kmalloc object gives SLUB freelist corruption, and the underflowed user-mapped page yields a write primitive into reallocated kernel memory — both are standard routes to arbitrary write and control-flow hijack.\nA:H - The double kfree() and page refcount underflow reliably corrupt allocator state, producing BUG/KASAN splats, oopses, and kernel panics, and the condition can be re-triggered repeatedly by a remote peer." } ] } ], "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": "cd1bbca03f3c1d845ce274c0d0a66de8e5929f72", "lessThan": "f2b85a4cc763841843de693bbd7308fe9a2c4c89", "status": "affected", "versionType": "git" }, { "version": "13eca403876bbea3716e82cdfe6f1e6febb38754", "lessThan": "81be85353b0f5a7b660635634b655329b429eefe", "status": "affected", "versionType": "git" }, { "version": "ab6397f072e5097f267abf5cb08a8004e6b17694", "lessThan": "1ac9fb84bc7ecd4bc6428118301d9d864d2a58d1", "status": "affected", "versionType": "git" }, { "version": "8590541473188741055d27b955db0777569438e3", "lessThan": "13114dc5543069f7b97991e3b79937b6da05f5b0", "status": "affected", "versionType": "git" }, { "version": "3ade391adc584f17b5570fd205de3ad029090368", "status": "affected", "versionType": "git" }, { "version": "5.15.160", "lessThan": "5.16", "status": "affected", "versionType": "semver" } ] }, { "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": "6.6.18", "lessThan": "6.6.21", "status": "affected", "versionType": "semver" }, { "version": "6.7.6", "lessThan": "6.7.9", "status": "affected", "versionType": "semver" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.6.18", "versionEndExcluding": "6.6.21" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.7.6", "versionEndExcluding": "6.7.9" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15.160" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/f2b85a4cc763841843de693bbd7308fe9a2c4c89" }, { "url": "https://git.kernel.org/stable/c/81be85353b0f5a7b660635634b655329b429eefe" }, { "url": "https://git.kernel.org/stable/c/1ac9fb84bc7ecd4bc6428118301d9d864d2a58d1" }, { "url": "https://git.kernel.org/stable/c/13114dc5543069f7b97991e3b79937b6da05f5b0" } ], "title": "tls: fix use-after-free on failed backlog decryption", "x_generator": { "engine": "bippy-1.2.0" } }, "adp": [ { "metrics": [ { "other": { "type": "ssvc", "content": { "timestamp": "2024-07-31T20:01:08.576744Z", "id": "CVE-2024-26800", "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": "2024-07-31T20:01:16.218Z" } }, { "providerMetadata": { "orgId": "af854a3a-2127-422b-91ae-364da2661108", "shortName": "CVE", "dateUpdated": "2024-08-02T00:14:13.534Z" }, "title": "CVE Program Container", "references": [ { "url": "https://git.kernel.org/stable/c/f2b85a4cc763841843de693bbd7308fe9a2c4c89", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/81be85353b0f5a7b660635634b655329b429eefe", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/1ac9fb84bc7ecd4bc6428118301d9d864d2a58d1", "tags": [ "x_transferred" ] }, { "url": "https://git.kernel.org/stable/c/13114dc5543069f7b97991e3b79937b6da05f5b0", "tags": [ "x_transferred" ] } ] } ] } }