fkie_cve-2021-47496
Vulnerability from fkie_nvd
Published
2024-05-22 09:15
Modified
2025-09-24 19:15
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: net/tls: Fix flipped sign in tls_err_abort() calls sk->sk_err appears to expect a positive value, a convention that ktls doesn't always follow and that leads to memory corruption in other code. For instance, [kworker] tls_encrypt_done(..., err=<negative error from crypto request>) tls_err_abort(.., err) sk->sk_err = err; [task] splice_from_pipe_feed ... tls_sw_do_sendpage if (sk->sk_err) { ret = -sk->sk_err; // ret is positive splice_from_pipe_feed (continued) ret = actor(...) // ret is still positive and interpreted as bytes // written, resulting in underflow of buf->len and // sd->len, leading to huge buf->offset and bogus // addresses computed in later calls to actor() Fix all tls_err_abort() callers to pass a negative error code consistently and centralize the error-prone sign flip there, throwing in a warning to catch future misuse and uninlining the function so it really does only warn once.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/da353fac65fede6b8b4cfe207f0d9408e3121105Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e0cfd5159f314d6b304d030363650b06a2299cbbPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/e41473543f75f7dbc5d605007e6f883f1bd13b9aPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f3dec7e7ace38224f82cf83f0049159d067c2e19Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/da353fac65fede6b8b4cfe207f0d9408e3121105Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/e0cfd5159f314d6b304d030363650b06a2299cbbPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/e41473543f75f7dbc5d605007e6f883f1bd13b9aPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/f3dec7e7ace38224f82cf83f0049159d067c2e19Patch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel 5.15
linux linux_kernel 5.15
linux linux_kernel 5.15
linux linux_kernel 5.15
linux linux_kernel 5.15
linux linux_kernel 5.15
linux linux_kernel 5.15


To clipboard 

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  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet/tls: Fix flipped sign in tls_err_abort() calls\n\nsk-\u003esk_err appears to expect a positive value, a convention that ktls\ndoesn\u0027t always follow and that leads to memory corruption in other code.\nFor instance,\n\n    [kworker]\n    tls_encrypt_done(..., err=\u003cnegative error from crypto request\u003e)\n      tls_err_abort(.., err)\n        sk-\u003esk_err = err;\n\n    [task]\n    splice_from_pipe_feed\n      ...\n        tls_sw_do_sendpage\n          if (sk-\u003esk_err) {\n            ret = -sk-\u003esk_err;  // ret is positive\n\n    splice_from_pipe_feed (continued)\n      ret = actor(...)  // ret is still positive and interpreted as bytes\n                        // written, resulting in underflow of buf-\u003elen and\n                        // sd-\u003elen, leading to huge buf-\u003eoffset and bogus\n                        // addresses computed in later calls to actor()\n\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."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: net/tls: corrige las llamadas invertidas de tls_err_abort() sk-\u0026gt;sk_err parece esperar un valor positivo, una convenci\u00f3n que ktls no siempre sigue y que conduce a da\u00f1os en la memoria en otro c\u00f3digo. Por ejemplo, [kworker] tls_encrypt_done(..., err=) tls_err_abort(.., err) sk-\u0026gt;sk_err = err; [tarea] splice_from_pipe_feed ... tls_sw_do_sendpage if (sk-\u0026gt;sk_err) { ret = -sk-\u0026gt;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-\u0026gt;len y // sd-\u0026gt;len, lo que genera enormes buf-\u0026gt;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": "2025-09-24T19:15:53.210",
  "metrics": {
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          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
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          "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"
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        "exploitabilityScore": 1.8,
        "impactScore": 5.9,
        "source": "nvd@nist.gov",
        "type": "Primary"
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  "published": "2024-05-22T09:15:11.447",
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  "vulnStatus": "Analyzed",
  "weaknesses": [
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          "lang": "en",
          "value": "CWE-787"
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      "source": "nvd@nist.gov",
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}


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