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Red Hat: CVE-2024-42265: kernel: protect the fetch of ->fd[fd] in do_dup2() from mispredictions (Multiple Advisories)

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Red Hat: CVE-2024-42265: kernel: protect the fetch of ->fd[fd] in do_dup2() from mispredictions (Multiple Advisories)

Severity
5
CVSS
(AV:L/AC:L/Au:S/C:N/I:N/A:C)
Published
08/17/2024
Created
09/26/2024
Added
09/25/2024
Modified
09/25/2024

Description

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.

Solution(s)

  • redhat-upgrade-kernel

References

  • CVE-2024-42265
  • RHSA-2024:7000

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