cve-2021-47496
Vulnerability from cvelistv5
Published
2024-05-22 08:19
Modified
2024-11-04 12:07
Severity ?
Summary
net/tls: Fix flipped sign in tls_err_abort() calls
Impacted products
LinuxLinux
LinuxLinux
Show details on NVD website


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                "id": "CVE-2021-47496",
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          "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."
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    "cveId": "CVE-2021-47496",
    "datePublished": "2024-05-22T08:19:43.489Z",
    "dateReserved": "2024-05-22T06:20:56.202Z",
    "dateUpdated": "2024-11-04T12:07:03.180Z",
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