CVE-2024-42265 (GCVE-0-2024-42265)
Vulnerability from cvelistv5
Published
2024-08-17 08:54
Modified
2025-11-03 22:02
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: protect the fetch of ->fd[fd] in do_dup2() from mispredictions both callers have verified that fd is not greater than ->max_fds; however, misprediction might end up with tofree = fdt->fd[fd]; being speculatively executed. That's wrong for the same reasons why it's wrong in close_fd()/file_close_fd_locked(); the same solution applies - array_index_nospec(fd, fdt->max_fds) could differ from fd only in case of speculative execution on mispredicted path.
References
Impacted products
Vendor Product Version
Linux Linux Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
Version: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2
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That\u0027s wrong for the same reasons\\nwhy it\u0027s wrong in close_fd()/file_close_fd_locked(); the same\\nsolution applies - array_index_nospec(fd, fdt-\u003emax_fds) could differ\\nfrom fd only in case of speculative execution on mispredicted path.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se resolvi\u00f3 la siguiente vulnerabilidad: proteger la recuperaci\u00f3n de -\u0026gt;fd[fd] en do_dup2() de predicciones err\u00f3neas; ambos llamadores han verificado que fd no es mayor que -\u0026gt;max_fds; sin embargo, una predicci\u00f3n err\u00f3nea podr\u00eda terminar con tofree = fdt-\u0026gt;fd[fd]; siendo ejecutado especulativamente. 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