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Por ejemplo, [kworker] tls_encrypt_done(..., err=) tls_err_abort(.., err) sk-&gt;sk_err = err; [tarea] splice_from_pipe_feed ... tls_sw_do_sendpage if (sk-&gt;sk_err) { ret = -sk-&gt;sk_err; // ret es positivo splice_from_pipe_feed (continuaci\u00f3n) ret = actor(...) // ret sigue siendo positivo y se interpreta como bytes // escritos, lo que resulta en un desbordamiento insuficiente de buf-&gt;len y // sd-&gt;len, lo que genera enormes buf-&gt;offset y bogus // direcciones calculadas en llamadas posteriores a actor(). Repare todas las llamadas tls_err_abort() para que pasen un c\u00f3digo de error negativo de manera consistente y centralice el cambio de se\u00f1al propenso a errores all\u00ed, lanzando una advertencia para detectar futuros usos indebidos y eliminaci\u00f3n de l\u00edneas. la funci\u00f3n por lo que realmente solo advierte una vez."}], "id": "CVE-2021-47496", "lastModified": "2026-06-17T04:17:37.573", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "nvd@nist.gov", "type": "Primary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2021-47496", "options": [{"exploitation": "none"}, {"automatable": "no"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2024-09-10T15:35:52.280096Z", "version": "2.0.3"}}]}, "published": "2024-05-22T09:15:11.447", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/da353fac65fede6b8b4cfe207f0d9408e3121105"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/e0cfd5159f314d6b304d030363650b06a2299cbb"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/e41473543f75f7dbc5d605007e6f883f1bd13b9a"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f3dec7e7ace38224f82cf83f0049159d067c2e19"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/da353fac65fede6b8b4cfe207f0d9408e3121105"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/e0cfd5159f314d6b304d030363650b06a2299cbb"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/e41473543f75f7dbc5d605007e6f883f1bd13b9a"}, {"source": "af854a3a-2127-422b-91ae-364da2661108", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/f3dec7e7ace38224f82cf83f0049159d067c2e19"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-787"}], "source": "nvd@nist.gov", "type": "Primary"}]}

{"bugzilla": {"description": "kernel: net/tls: Fix flipped sign in tls_err_abort() calls", "id": "2282919", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2282919"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.6", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:L/I:L/A:H", "status": "draft"}, "cwe": "CWE-191->CWE-124", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nnet/tls: Fix flipped sign in tls_err_abort() calls\nsk->sk_err appears to expect a positive value, a convention that ktls\ndoesn't always follow and that leads to memory corruption in other code.\nFor instance,\n[kworker]\ntls_encrypt_done(..., err=<negative error from crypto request>)\ntls_err_abort(.., err)\nsk->sk_err = err;\n[task]\nsplice_from_pipe_feed\n...\ntls_sw_do_sendpage\nif (sk->sk_err) {\nret = -sk->sk_err; // ret is positive\nsplice_from_pipe_feed (continued)\nret = actor(...) // ret is still positive and interpreted as bytes\n// written, resulting in underflow of buf->len and\n// sd->len, leading to huge buf->offset and bogus\n// addresses computed in later calls to actor()\nFix all tls_err_abort() callers to pass a negative error code\nconsistently and centralize the error-prone sign flip there, throwing in\na warning to catch future misuse and uninlining the function so it\nreally does only warn once."], "name": "CVE-2021-47496", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2024-05-22T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2021-47496\nhttps://nvd.nist.gov/vuln/detail/CVE-2021-47496\nhttps://lore.kernel.org/linux-cve-announce/2024052242-CVE-2021-47496-4d0d@gregkh/T"], "threat_severity": "Low"}

{"created": "2025-07-12T22:31:05.163290+00:00", "updated": "2025-07-12T22:31:05.163362+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}